diff --git a/package.json b/package.json
index d7ef31c115..d0805914b0 100644
--- a/package.json
+++ b/package.json
@@ -33,17 +33,18 @@
     "@blueprintjs/datetime2": "^2.3.3",
     "@blueprintjs/icons": "^6.0.0",
     "@blueprintjs/select": "^5.1.3",
+    "@convergencelabs/ace-collab-ext": "^0.6.0",
     "@mantine/hooks": "^7.11.2",
     "@octokit/rest": "^20.0.0",
     "@reduxjs/toolkit": "^1.9.7",
     "@sentry/browser": "^8.33.0",
     "@sourceacademy/c-slang": "^1.0.21",
-    "@sourceacademy/sharedb-ace": "^2.0.3",
+    "@sourceacademy/sharedb-ace": "^2.1.0",
     "@sourceacademy/sling-client": "^0.1.0",
     "@szhsin/react-menu": "^4.0.0",
     "@tanstack/react-table": "^8.9.3",
     "@tremor/react": "^1.8.2",
-    "ace-builds": "^1.36.3",
+    "ace-builds": "^1.42.1",
     "acorn": "^8.9.0",
     "ag-grid-community": "^32.3.1",
     "ag-grid-react": "^32.3.1",
@@ -58,6 +59,7 @@
     "hastscript": "^9.0.0",
     "i18next": "^25.0.0",
     "i18next-browser-languagedetector": "^8.0.0",
+    "immer": "^10.1.1",
     "java-slang": "^1.0.13",
     "js-cookie": "^3.0.5",
     "js-slang": "^1.0.84",
@@ -113,7 +115,6 @@
     "@babel/plugin-proposal-private-property-in-object": "^7.21.11",
     "@babel/preset-typescript": "^7.24.1",
     "@babel/runtime": "^7.24.5",
-    "@convergencelabs/ace-collab-ext": "^0.6.0",
     "@rsbuild/core": "^1.3.12",
     "@rsbuild/plugin-eslint": "^1.1.1",
     "@rsbuild/plugin-node-polyfill": "^1.3.0",
@@ -126,7 +127,7 @@
     "@testing-library/dom": "^10.4.0",
     "@testing-library/jest-dom": "^6.0.0",
     "@testing-library/react": "^16.0.0",
-    "@testing-library/user-event": "^14.4.3",
+    "@testing-library/user-event": "^14.6.0",
     "@types/estree": "^1.0.5",
     "@types/gapi": "^0.0.47",
     "@types/gapi.auth2": "^0.0.61",
diff --git a/src/commons/application/ApplicationTypes.ts b/src/commons/application/ApplicationTypes.ts
index 9f91a27e1f..87bc1e9e2d 100644
--- a/src/commons/application/ApplicationTypes.ts
+++ b/src/commons/application/ApplicationTypes.ts
@@ -418,7 +418,8 @@ export const createDefaultWorkspace = (workspaceLocation: WorkspaceLocation): Wo
   enableDebugging: true,
   debuggerContext: {} as DebuggerContext,
   lastDebuggerResult: undefined,
-  files: {}
+  files: {},
+  updateUserRoleCallback: () => {}
 });
 
 const defaultFileName = 'program.js';
diff --git a/src/commons/collabEditing/CollabEditingActions.ts b/src/commons/collabEditing/CollabEditingActions.ts
index 61b5516859..f9c80fcfd6 100644
--- a/src/commons/collabEditing/CollabEditingActions.ts
+++ b/src/commons/collabEditing/CollabEditingActions.ts
@@ -1,3 +1,5 @@
+import type { CollabEditingAccess } from '@sourceacademy/sharedb-ace/types';
+
 import { createActions } from '../redux/utils';
 import { WorkspaceLocation } from '../workspace/WorkspaceTypes';
 
@@ -8,7 +10,7 @@ const CollabEditingActions = createActions('collabEditing', {
   }),
   setSessionDetails: (
     workspaceLocation: WorkspaceLocation,
-    sessionDetails: { docId: string; readOnly: boolean } | null
+    sessionDetails: { docId?: string; readOnly?: boolean; owner?: boolean } | null
   ) => ({ workspaceLocation, sessionDetails }),
   /**
    * Sets ShareDB connection status.
@@ -19,11 +21,23 @@ const CollabEditingActions = createActions('collabEditing', {
   setSharedbConnected: (workspaceLocation: WorkspaceLocation, connected: boolean) => ({
     workspaceLocation,
     connected
+  }),
+  setUpdateUserRoleCallback: (
+    workspaceLocation: WorkspaceLocation,
+    updateUserRoleCallback: (id: string, newRole: CollabEditingAccess) => void
+  ) => ({
+    workspaceLocation,
+    updateUserRoleCallback
   })
 });
 
 // For compatibility with existing code (reducer)
-export const { setEditorSessionId, setSessionDetails, setSharedbConnected } = CollabEditingActions;
+export const {
+  setEditorSessionId,
+  setSessionDetails,
+  setSharedbConnected,
+  setUpdateUserRoleCallback
+} = CollabEditingActions;
 
 // For compatibility with existing code (actions helper)
 export default CollabEditingActions;
diff --git a/src/commons/collabEditing/CollabEditingHelper.ts b/src/commons/collabEditing/CollabEditingHelper.ts
index c7a5d29ee8..e191c3840e 100644
--- a/src/commons/collabEditing/CollabEditingHelper.ts
+++ b/src/commons/collabEditing/CollabEditingHelper.ts
@@ -13,9 +13,17 @@ export function getSessionUrl(sessionId: string, ws?: boolean): string {
   return url.toString();
 }
 
+export function getPlaygroundSessionUrl(sessionId: string): string {
+  let url = window.location.href;
+  if (window.location.href.endsWith('/playground')) {
+    url += `/${sessionId}`;
+  }
+  return url;
+}
+
 export async function getDocInfoFromSessionId(
   sessionId: string
-): Promise<{ docId: string; readOnly: boolean } | null> {
+): Promise<{ docId: string; defaultReadOnly: boolean } | null> {
   const resp = await fetch(getSessionUrl(sessionId));
 
   if (resp && resp.ok) {
@@ -27,7 +35,7 @@ export async function getDocInfoFromSessionId(
 
 export async function createNewSession(
   contents: string
-): Promise<{ docId: string; sessionEditingId: string; sessionViewingId: string }> {
+): Promise<{ docId: string; sessionId: string }> {
   const resp = await fetch(Constants.sharedbBackendUrl, {
     method: 'POST',
     body: JSON.stringify({ contents }),
@@ -42,3 +50,19 @@ export async function createNewSession(
 
   return resp.json();
 }
+
+export async function changeDefaultEditable(sessionId: string, defaultReadOnly: boolean) {
+  const resp = await fetch(getSessionUrl(sessionId), {
+    method: 'PATCH',
+    body: JSON.stringify({ defaultReadOnly }),
+    headers: { 'Content-Type': 'application/json' }
+  });
+
+  if (!resp || !resp.ok) {
+    throw new Error(
+      resp ? `Could not update session: ${await resp.text()}` : 'Unknown error updating session'
+    );
+  }
+
+  return resp.json();
+}
diff --git a/src/commons/controlBar/ControlBarSessionButton.tsx b/src/commons/controlBar/ControlBarSessionButton.tsx
index 915f73b174..2368ffff4c 100644
--- a/src/commons/controlBar/ControlBarSessionButton.tsx
+++ b/src/commons/controlBar/ControlBarSessionButton.tsx
@@ -1,26 +1,20 @@
-import {
-  Classes,
-  Colors,
-  Divider,
-  FormGroup,
-  Menu,
-  Popover,
-  Text,
-  Tooltip
-} from '@blueprintjs/core';
+import { Classes, Colors, Divider, FormGroup, Popover, Text, Tooltip } from '@blueprintjs/core';
 import { IconNames } from '@blueprintjs/icons';
-import React from 'react';
+import React, { useCallback, useEffect, useRef, useState } from 'react';
 import * as CopyToClipboard from 'react-copy-to-clipboard';
+import { useParams } from 'react-router';
 
 import { createNewSession, getDocInfoFromSessionId } from '../collabEditing/CollabEditingHelper';
 import ControlButton from '../ControlButton';
-import { showWarningMessage } from '../utils/notifications/NotificationsHelper';
+import { showSuccessMessage, showWarningMessage } from '../utils/notifications/NotificationsHelper';
 
 type ControlBarSessionButtonsProps = DispatchProps & StateProps;
 
 type DispatchProps = {
   handleSetEditorSessionId?: (editorSessionId: string) => void;
-  handleSetSessionDetails?: (sessionDetails: { docId: string; readOnly: boolean } | null) => void;
+  handleSetSessionDetails?: (
+    sessionDetails: { docId: string; readOnly: boolean; owner: boolean } | null
+  ) => void;
 };
 
 type StateProps = {
@@ -31,215 +25,177 @@ type StateProps = {
   key: string;
 };
 
-type State = {
-  joinElemValue: string;
-  sessionEditingId: string;
-  sessionViewingId: string;
-};
-
 function handleError(error: any) {
   showWarningMessage(`Could not connect: ${(error && error.message) || error || 'Unknown error'}`);
 }
 
-export class ControlBarSessionButtons extends React.PureComponent<
-  ControlBarSessionButtonsProps,
-  State
-> {
-  private sessionEditingIdInputElem: React.RefObject<HTMLInputElement>;
-  private sessionViewingIdInputElem: React.RefObject<HTMLInputElement>;
-
-  constructor(props: ControlBarSessionButtonsProps) {
-    super(props);
-    this.state = { joinElemValue: '', sessionEditingId: '', sessionViewingId: '' };
-
-    this.handleChange = this.handleChange.bind(this);
-    this.sessionEditingIdInputElem = React.createRef();
-    this.sessionViewingIdInputElem = React.createRef();
-    this.selectSessionEditingId = this.selectSessionEditingId.bind(this);
-    this.selectSessionViewingId = this.selectSessionViewingId.bind(this);
-  }
-
-  public render() {
-    const handleStartInvite = () => {
-      // FIXME this handler should be a Saga action or at least in a controller
-      if (this.props.editorSessionId === '') {
-        createNewSession(this.props.getEditorValue()).then(resp => {
-          this.setState({
-            sessionEditingId: resp.sessionEditingId,
-            sessionViewingId: resp.sessionViewingId
-          });
-          this.props.handleSetEditorSessionId!(resp.sessionEditingId);
-          this.props.handleSetSessionDetails!({ docId: resp.docId, readOnly: false });
-        }, handleError);
-      }
-    };
-
-    const inviteButtonPopoverContent = (
-      <div style={{ display: 'flex', flexDirection: 'column' }}>
-        {!this.props.editorSessionId ? (
-          <>
-            <Text>You are not currently in any session.</Text>
-            <Divider />
-            <ControlButton label={'Create'} icon={IconNames.ADD} onClick={handleStartInvite} />
-          </>
-        ) : (
-          <>
-            <Text>
-              You have joined the session as{' '}
-              {this.state.sessionEditingId ? 'an editor' : 'a viewer'}.
-            </Text>
-            <Divider />
-            {this.state.sessionEditingId && (
-              <FormGroup subLabel="Invite as editor">
-                <input
-                  value={this.state.sessionEditingId}
-                  readOnly={true}
-                  ref={this.sessionEditingIdInputElem}
-                />
-                <CopyToClipboard text={'' + this.state.sessionEditingId}>
-                  <ControlButton icon={IconNames.DUPLICATE} onClick={this.selectSessionEditingId} />
-                </CopyToClipboard>
-              </FormGroup>
-            )}
-            {this.state.sessionViewingId && (
-              <FormGroup subLabel="Invite as viewer">
-                <input
-                  value={this.state.sessionViewingId}
-                  readOnly={true}
-                  ref={this.sessionViewingIdInputElem}
-                />
-                <CopyToClipboard text={'' + this.state.sessionViewingId}>
-                  <ControlButton icon={IconNames.DUPLICATE} onClick={this.selectSessionViewingId} />
-                </CopyToClipboard>
-              </FormGroup>
-            )}
-          </>
-        )}
-      </div>
-    );
-
-    const inviteButton = (
-      <Popover
-        popoverClassName="Popover-share"
-        inheritDarkTheme={false}
-        content={inviteButtonPopoverContent}
-      >
-        <ControlButton label="Invite" icon={IconNames.GRAPH} />
-      </Popover>
-    );
+export function ControlBarSessionButtons(props: ControlBarSessionButtonsProps) {
+  const joinElemRef = useRef('');
+  const [sessionId, setSessionId] = useState('');
+  const [defaultReadOnly, setDefaultReadOnly] = useState(true);
+  const [isOwner, setIsOwner] = useState(false);
+
+  const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    joinElemRef.current = event.target.value;
+  };
+
+  const handleStartInvite = () => {
+    // FIXME this handler should be a Saga action or at least in a controller
+    if (props.editorSessionId === '') {
+      createNewSession(props.getEditorValue()).then(resp => {
+        setSessionId(resp.sessionId);
+        props.handleSetEditorSessionId!(resp.sessionId);
+        props.handleSetSessionDetails!({ docId: resp.docId, readOnly: false, owner: true });
+        setIsOwner(true);
+      }, handleError);
+    }
+  };
 
-    const handleStartJoining = (event: React.FormEvent<HTMLFormElement>) => {
+  const handleStartJoining = useCallback(
+    (event: React.FormEvent<HTMLFormElement>) => {
       event.preventDefault();
+      const joinElemValue = joinElemRef.current;
+
       // FIXME this handler should be a Saga action or at least in a controller
-      getDocInfoFromSessionId(this.state.joinElemValue).then(
+      getDocInfoFromSessionId(joinElemValue).then(
         docInfo => {
           if (docInfo !== null) {
-            this.props.handleSetEditorSessionId!(this.state!.joinElemValue);
-            this.props.handleSetSessionDetails!(docInfo);
-            if (docInfo.readOnly) {
-              this.setState({
-                sessionEditingId: '',
-                sessionViewingId: this.state.joinElemValue
-              });
-            } else {
-              this.setState({
-                sessionEditingId: this.state.joinElemValue,
-                sessionViewingId: ''
-              });
-            }
+            props.handleSetEditorSessionId!(joinElemValue);
+            props.handleSetSessionDetails!({
+              docId: docInfo.docId,
+              readOnly: docInfo.defaultReadOnly,
+              owner: false
+            });
+            setSessionId(joinElemValue);
+            setDefaultReadOnly(docInfo.defaultReadOnly);
+            setIsOwner(false);
           } else {
-            this.props.handleSetEditorSessionId!('');
-            this.props.handleSetSessionDetails!(null);
+            props.handleSetEditorSessionId!('');
+            props.handleSetSessionDetails!(null);
             showWarningMessage('Could not find a session with that ID.');
+            if (
+              window.location.href.includes('/playground') &&
+              !window.location.href.endsWith('/playground')
+            ) {
+              window.history.pushState({}, document.title, '/playground');
+            }
           }
         },
         error => {
-          this.props.handleSetEditorSessionId!('');
+          props.handleSetEditorSessionId!('');
           handleError(error);
         }
       );
-    };
-
-    const joinButtonPopoverContent = (
-      // TODO: this form should use Blueprint
-      <form onSubmit={handleStartJoining}>
-        <input type="text" value={this.state.joinElemValue} onChange={this.handleChange} />
-        <span className={Classes.POPOVER_DISMISS}>
-          <ControlButton icon={IconNames.KEY_ENTER} options={{ type: 'submit' }} />
-        </span>
-      </form>
-    );
-
-    const joinButton = (
-      <Popover
-        popoverClassName="Popover-share"
-        inheritDarkTheme={false}
-        content={joinButtonPopoverContent}
-      >
-        <ControlButton label="Join" icon={IconNames.LOG_IN} />
-      </Popover>
-    );
-
-    const leaveButton = (
-      <ControlButton
-        label="Leave"
-        icon={IconNames.FEED}
-        onClick={() => {
-          // FIXME: this handler should be a Saga action or at least in a controller
-          this.props.handleSetEditorSessionId!('');
-          this.setState({ joinElemValue: '', sessionEditingId: '', sessionViewingId: '' });
-        }}
-      />
-    );
-
-    const tooltipContent = this.props.isFolderModeEnabled
-      ? 'Currently unsupported in Folder mode'
-      : undefined;
-
-    return (
-      <Tooltip content={tooltipContent} disabled={tooltipContent === undefined}>
-        <Popover
-          content={
-            <Menu large={true}>
-              {inviteButton}
-              {this.props.editorSessionId === '' ? joinButton : leaveButton}
-            </Menu>
-          }
-          disabled={this.props.isFolderModeEnabled}
+    },
+    [props.handleSetEditorSessionId, props.handleSetSessionDetails]
+  );
+
+  const leaveButton = (
+    <ControlButton
+      label="Leave"
+      icon={IconNames.LOG_OUT}
+      onClick={() => {
+        // FIXME: this handler should be a Saga action or at least in a controller
+        props.handleSetEditorSessionId!('');
+        joinElemRef.current = '';
+        setSessionId('');
+      }}
+    />
+  );
+
+  const inviteButtonPopoverContent = (
+    <div style={{ display: 'flex', flexDirection: 'column' }}>
+      {!props.editorSessionId ? (
+        <div
+          style={{
+            padding: '10px',
+            display: 'flex',
+            flexDirection: 'column',
+            justifyContent: 'center'
+          }}
         >
+          <Text>You are not currently in any session.</Text>
+          <Divider />
           <ControlButton
-            label="Session"
-            icon={IconNames.SOCIAL_MEDIA}
-            options={{
-              iconColor:
-                this.props.editorSessionId === ''
-                  ? undefined
-                  : this.props.sharedbConnected
-                    ? Colors.GREEN3
-                    : Colors.RED3
-            }}
-            isDisabled={this.props.isFolderModeEnabled}
+            label={'Create a new session'}
+            icon={IconNames.ADD}
+            onClick={handleStartInvite}
           />
-        </Popover>
-      </Tooltip>
-    );
-  }
-
-  private selectSessionEditingId() {
-    if (this.sessionEditingIdInputElem.current !== null) {
-      this.sessionEditingIdInputElem.current.focus();
-      this.sessionEditingIdInputElem.current.select();
-    }
-  }
-
-  private selectSessionViewingId() {
-    if (this.sessionViewingIdInputElem.current !== null) {
-      this.sessionViewingIdInputElem.current.focus();
-      this.sessionViewingIdInputElem.current.select();
+          <br />
+          <span>... or join an existing one</span>
+          <br />
+          <form
+            onSubmit={handleStartJoining}
+            style={{ display: 'flex', flexDirection: 'row', justifyContent: 'space-evenly' }}
+          >
+            <input type="text" onChange={handleChange} placeholder="Type your code here..." />
+            <span className={Classes.POPOVER_DISMISS}>
+              <ControlButton icon={IconNames.LOG_IN} options={{ type: 'submit' }} />
+            </span>
+          </form>
+        </div>
+      ) : (
+        <div style={{ padding: '10px', display: 'flex', flexDirection: 'column' }}>
+          <Text>
+            You have joined the session as{' '}
+            {isOwner ? 'the owner' : defaultReadOnly ? 'a viewer' : 'an editor'}.
+          </Text>
+          <Divider />
+          {sessionId && (
+            <div
+              style={{
+                display: 'flex',
+                flexDirection: 'row',
+                justifyContent: 'space-evenly',
+                alignItems: 'center'
+              }}
+            >
+              <FormGroup subLabel="Invite other users to this session">
+                <input value={sessionId} readOnly={true} />
+              </FormGroup>
+              <CopyToClipboard
+                text={sessionId}
+                onCopy={() => showSuccessMessage('Copied to clipboard: ' + sessionId)}
+              >
+                <ControlButton icon={IconNames.DUPLICATE} />
+              </CopyToClipboard>
+            </div>
+          )}
+          {leaveButton}
+        </div>
+      )}
+    </div>
+  );
+
+  const tooltipContent = props.isFolderModeEnabled
+    ? 'Currently unsupported in Folder mode'
+    : undefined;
+
+  const { playgroundCode } = useParams<{ playgroundCode: string }>();
+  useEffect(() => {
+    if (playgroundCode) {
+      joinElemRef.current = playgroundCode;
+      handleStartJoining({ preventDefault: () => {} } as React.FormEvent<HTMLFormElement>);
     }
-  }
-
-  private handleChange(event: React.ChangeEvent<HTMLInputElement>) {
-    this.setState({ joinElemValue: event.target.value });
-  }
+  }, [playgroundCode, handleStartJoining]);
+
+  return (
+    <Tooltip content={tooltipContent} disabled={tooltipContent === undefined}>
+      <Popover content={inviteButtonPopoverContent} disabled={props.isFolderModeEnabled}>
+        <ControlButton
+          label="Session"
+          icon={IconNames.SOCIAL_MEDIA}
+          options={{
+            iconColor:
+              props.editorSessionId === ''
+                ? undefined
+                : props.sharedbConnected
+                  ? Colors.GREEN3
+                  : Colors.RED3
+          }}
+          isDisabled={props.isFolderModeEnabled}
+        />
+      </Popover>
+    </Tooltip>
+  );
 }
diff --git a/src/commons/editor/Editor.tsx b/src/commons/editor/Editor.tsx
index e941b3ec36..31127f0160 100644
--- a/src/commons/editor/Editor.tsx
+++ b/src/commons/editor/Editor.tsx
@@ -25,6 +25,7 @@ import { Chapter, Variant } from 'js-slang/dist/types';
 import React from 'react';
 import AceEditor, { IAceEditorProps, IEditorProps } from 'react-ace';
 import { IAceEditor } from 'react-ace/lib/types';
+import { SALanguage } from '../application/ApplicationTypes';
 import { EditorBinding } from '../WorkspaceSettingsContext';
 import { getModeString, selectMode } from '../utils/AceHelper';
 import { objectEntries } from '../utils/TypeHelper';
@@ -38,6 +39,8 @@ import useHighlighting from './UseHighlighting';
 import useNavigation from './UseNavigation';
 import useRefactor from './UseRefactor';
 import useShareAce from './UseShareAce';
+import type { SharedbAceUser } from '@sourceacademy/sharedb-ace/types';
+import { ExternalLibraryName } from '../application/types/ExternalTypes';
 
 export type EditorKeyBindingHandlers = { [name in KeyFunction]?: () => void };
 export type EditorHook = (
@@ -62,13 +65,16 @@ type DispatchProps = {
 
 type EditorStateProps = {
   editorSessionId: string;
-  sessionDetails: { docId: string; readOnly: boolean } | null;
+  sessionDetails: { docId: string; readOnly: boolean; owner: boolean } | null;
   isEditorAutorun: boolean;
   sourceChapter?: Chapter;
   externalLibraryName?: string;
   sourceVariant?: Variant;
   hooks?: EditorHook[];
   editorBinding?: EditorBinding;
+  setUsers?: React.Dispatch<React.SetStateAction<Record<string, SharedbAceUser>>>;
+  // TODO: Handle changing of external library
+  updateLanguageCallback?: (sublanguage: SALanguage, e: any) => void;
 };
 
 export type EditorTabStateProps = {
@@ -358,22 +364,7 @@ const EditorBase = React.memo((props: EditorProps & LocalStateProps) => {
       // See AceHelper#selectMode for more information.
       props.session.setMode(editor.getSession().getMode());
       editor.setSession(props.session);
-      /* eslint-disable */
-
-      // Add changeCursor event listener onto the current session.
-      // In ReactAce, this event listener is only bound on component
-      // mounting/creation, and hence changing sessions will need rebinding.
-      // See react-ace/src/ace.tsx#263,#460 for more details. We also need to
-      // ensure that event listener is only bound once to prevent memory leaks.
-      // We also need to check non-documented property _eventRegistry to
-      // see if the changeCursor listener event has been added yet.
-
-      // @ts-ignore
-      if (editor.getSession().selection._eventRegistry.changeCursor.length < 2) {
-        editor.getSession().selection.on('changeCursor', reactAceRef.current!.onCursorChange);
-      }
 
-      /* eslint-enable */
       // Give focus to the editor tab only after switching from another tab.
       // This is necessary to prevent 'unstable_flushDiscreteUpdates' warnings.
       if (filePath !== undefined) {
@@ -412,7 +403,7 @@ const EditorBase = React.memo((props: EditorProps & LocalStateProps) => {
   const [sourceChapter, sourceVariant, externalLibraryName] = [
     props.sourceChapter || Chapter.SOURCE_1,
     props.sourceVariant || Variant.DEFAULT,
-    props.externalLibraryName || 'NONE'
+    props.externalLibraryName || ExternalLibraryName.NONE
   ];
 
   // this function defines the Ace language and highlighting mode for the
@@ -660,8 +651,9 @@ const EditorBase = React.memo((props: EditorProps & LocalStateProps) => {
 
   return (
     <Card className="Editor">
-      <div className="row editor-react-ace" data-testid="Editor">
+      <div className="row editor-react-ace" data-testid="Editor" id="editor-react-ace">
         <AceEditor {...aceEditorProps} ref={reactAceRef} />
+        <div id="ace-radar-view" />
       </div>
     </Card>
   );
diff --git a/src/commons/editor/UseShareAce.tsx b/src/commons/editor/UseShareAce.tsx
index 8a08ba0aba..61816a7fb9 100644
--- a/src/commons/editor/UseShareAce.tsx
+++ b/src/commons/editor/UseShareAce.tsx
@@ -1,11 +1,21 @@
 import '@convergencelabs/ace-collab-ext/dist/css/ace-collab-ext.css';
 
-import { AceMultiCursorManager } from '@convergencelabs/ace-collab-ext';
+import {
+  AceMultiCursorManager,
+  AceMultiSelectionManager,
+  AceRadarView
+} from '@convergencelabs/ace-collab-ext';
 import * as Sentry from '@sentry/browser';
 import sharedbAce from '@sourceacademy/sharedb-ace';
-import React, { useMemo } from 'react';
+import type SharedbAceBinding from '@sourceacademy/sharedb-ace/binding';
+import { CollabEditingAccess } from '@sourceacademy/sharedb-ace/types';
+import React from 'react';
+import { useDispatch } from 'react-redux';
 
+import { getLanguageConfig } from '../application/ApplicationTypes';
+import CollabEditingActions from '../collabEditing/CollabEditingActions';
 import { getDocInfoFromSessionId, getSessionUrl } from '../collabEditing/CollabEditingHelper';
+import { parseModeString } from '../utils/AceHelper';
 import { useSession } from '../utils/Hooks';
 import { showSuccessMessage } from '../utils/notifications/NotificationsHelper';
 import { EditorHook } from './Editor';
@@ -17,48 +27,116 @@ import { EditorHook } from './Editor';
 // keyBindings allow exporting new hotkeys
 // reactAceRef is the underlying reactAce instance for hooking.
 
+const color = getColor();
+
 const useShareAce: EditorHook = (inProps, outProps, keyBindings, reactAceRef) => {
   // use a ref to refer to any other props so that we run the effect below
-  // *only* when the editorSessionId changes
+  // *only* when the editorSessionId or sessionDetails changes
   const propsRef = React.useRef(inProps);
   propsRef.current = inProps;
 
   const { editorSessionId, sessionDetails } = inProps;
-
-  const { name } = useSession();
-
-  const user = useMemo(() => ({ name, color: getColor() }), [name]);
+  const { name, userId } = useSession();
+  const dispatch = useDispatch();
 
   React.useEffect(() => {
     if (!editorSessionId || !sessionDetails) {
       return;
     }
 
+    const collabEditorAccess = sessionDetails.owner
+      ? CollabEditingAccess.OWNER
+      : sessionDetails.readOnly
+        ? CollabEditingAccess.VIEWER
+        : CollabEditingAccess.EDITOR;
+
+    const user = {
+      name: name || 'Unnamed user',
+      color,
+      role: collabEditorAccess
+    };
+
     const editor = reactAceRef.current!.editor;
-    const cursorManager = new AceMultiCursorManager(editor.getSession());
+    const session = editor.getSession();
+    // TODO: Hover over the indicator to show the username as well
+    const cursorManager = new AceMultiCursorManager(session);
+    const selectionManager = new AceMultiSelectionManager(session);
+    const radarManager = new AceRadarView('ace-radar-view', editor);
+
+    // @ts-expect-error hotfix to remove all views in radarManager
+    radarManager.removeAllViews = () => {
+      // @ts-expect-error hotfix to remove all views in radarManager
+      for (const id in radarManager._views) {
+        radarManager.removeView(id);
+      }
+    };
+
     const ShareAce = new sharedbAce(sessionDetails.docId, {
       user,
-      cursorManager,
       WsUrl: getSessionUrl(editorSessionId, true),
-      pluginWsUrl: null,
       namespace: 'sa'
     });
 
-    ShareAce.on('ready', () => {
-      ShareAce.add(editor, cursorManager, ['contents'], []);
+    const updateUsers = (binding: SharedbAceBinding) => {
+      if (binding.connectedUsers === undefined) {
+        return;
+      }
+      propsRef.current.setUsers?.(binding.connectedUsers);
+      const myUserId = Object.keys(ShareAce.usersPresence.localPresences)[0];
+      if (binding.connectedUsers[myUserId].role !== user.role) {
+        // Change in role, update readOnly status in sessionDetails
+        dispatch(
+          CollabEditingActions.setSessionDetails('playground', {
+            readOnly: binding.connectedUsers[myUserId].role === CollabEditingAccess.VIEWER
+          })
+        );
+      }
+    };
+
+    const shareAceReady = () => {
+      if (!sessionDetails) {
+        return;
+      }
+      const binding = ShareAce.add(
+        editor,
+        ['contents'],
+        {
+          cursorManager,
+          selectionManager,
+          radarManager
+        },
+        {
+          languageSelectHandler: (language: string) => {
+            const { chapter, variant } = parseModeString(language);
+            propsRef.current.updateLanguageCallback?.(getLanguageConfig(chapter, variant), null);
+          }
+        }
+      );
       propsRef.current.handleSetSharedbConnected!(true);
+      dispatch(
+        CollabEditingActions.setUpdateUserRoleCallback('playground', binding.changeUserRole)
+      );
 
       // Disables editor in a read-only session
       editor.setReadOnly(sessionDetails.readOnly);
+      navigator.clipboard.writeText(editorSessionId).then(() => {
+        showSuccessMessage(
+          `You have joined a session as ${sessionDetails.readOnly ? 'a viewer' : 'an editor'}. Copied to clipboard: ${editorSessionId}`
+        );
+      });
+
+      updateUsers(binding);
+      binding.usersPresence.on('receive', () => updateUsers(binding));
+      window.history.pushState({}, document.title, '/playground/' + editorSessionId);
+    };
 
-      showSuccessMessage(
-        'You have joined a session as ' + (sessionDetails.readOnly ? 'a viewer.' : 'an editor.')
-      );
-    });
-    ShareAce.on('error', (path: string, error: any) => {
+    const shareAceError = (path: string, error: any) => {
       console.error('ShareAce error', error);
       Sentry.captureException(error);
-    });
+    };
+
+    ShareAce.on('ready', shareAceReady);
+    ShareAce.on('error', shareAceError);
 
     // WebSocket connection status detection logic
     const WS = ShareAce.WS;
@@ -96,13 +174,29 @@ const useShareAce: EditorHook = (inProps, outProps, keyBindings, reactAceRef) =>
       }
       ShareAce.WS.close();
 
+      ShareAce.off('ready', shareAceReady);
+      ShareAce.off('error', shareAceError);
+
       // Resets editor to normal after leaving the session
       editor.setReadOnly(false);
 
       // Removes all cursors
       cursorManager.removeAll();
+
+      // Removes all selections
+      selectionManager.removeAll();
+
+      // @ts-expect-error hotfix to remove all views in radarManager
+      radarManager.removeAllViews();
+
+      if (
+        window.location.href.includes('/playground') &&
+        !window.location.href.endsWith('/playground')
+      ) {
+        window.history.pushState({}, document.title, '/playground');
+      }
     };
-  }, [editorSessionId, sessionDetails, reactAceRef, user]);
+  }, [editorSessionId, sessionDetails, reactAceRef, userId, name, dispatch]);
 };
 
 function getColor() {
diff --git a/src/commons/navigationBar/NavigationBar.tsx b/src/commons/navigationBar/NavigationBar.tsx
index 01b0c770f4..5bb3a65e6c 100644
--- a/src/commons/navigationBar/NavigationBar.tsx
+++ b/src/commons/navigationBar/NavigationBar.tsx
@@ -258,7 +258,7 @@ const NavigationBar: React.FC = () => {
 
   const commonNavbarRight = (
     <NavbarGroup align={Alignment.RIGHT}>
-      {location.pathname.startsWith('/playground') && <NavigationBarLangSelectButton />}
+      <NavigationBarLangSelectButton />
       <NavLink
         className={({ isActive }) =>
           classNames('NavigationBar__link', Classes.BUTTON, Classes.MINIMAL, {
@@ -302,7 +302,7 @@ const NavigationBar: React.FC = () => {
       </Navbar>
 
       <Routes>
-        <Route path="/playground" element={null} />
+        <Route path="/playground/*" element={null} />
         <Route path="/contributors" element={null} />
         <Route path="/courses/:courseId/sourcecast" element={null} />
         <Route path="/courses/:courseId/achievements" element={null} />
diff --git a/src/commons/navigationBar/subcomponents/__tests__/NavigationBarLangSelectButton.tsx b/src/commons/navigationBar/subcomponents/__tests__/NavigationBarLangSelectButton.tsx
index 553ad6fd26..2e3f7db798 100644
--- a/src/commons/navigationBar/subcomponents/__tests__/NavigationBarLangSelectButton.tsx
+++ b/src/commons/navigationBar/subcomponents/__tests__/NavigationBarLangSelectButton.tsx
@@ -1,6 +1,5 @@
 import { render } from '@testing-library/react';
-import userEvent from '@testing-library/user-event';
-import { UserEvent } from '@testing-library/user-event/dist/types/setup/setup';
+import userEvent, { type UserEvent } from '@testing-library/user-event';
 import { Provider } from 'react-redux';
 
 import { SupportedLanguage } from '../../../../commons/application/ApplicationTypes';
diff --git a/src/commons/researchAgreementPrompt/__tests__/ResearchAgreementPrompt.tsx b/src/commons/researchAgreementPrompt/__tests__/ResearchAgreementPrompt.tsx
index c52c9a999e..b45ee96697 100644
--- a/src/commons/researchAgreementPrompt/__tests__/ResearchAgreementPrompt.tsx
+++ b/src/commons/researchAgreementPrompt/__tests__/ResearchAgreementPrompt.tsx
@@ -1,6 +1,6 @@
 import { render, screen } from '@testing-library/react';
+import type { UserEvent } from '@testing-library/user-event';
 import userEvent from '@testing-library/user-event';
-import { UserEvent } from '@testing-library/user-event/dist/types/setup/setup';
 import { Provider, useDispatch } from 'react-redux';
 import SessionActions from 'src/commons/application/actions/SessionActions';
 import { mockInitialStore } from 'src/commons/mocks/StoreMocks';
diff --git a/src/commons/sagas/SideContentSaga.ts b/src/commons/sagas/SideContentSaga.ts
index 2f99877591..59fa2ed563 100644
--- a/src/commons/sagas/SideContentSaga.ts
+++ b/src/commons/sagas/SideContentSaga.ts
@@ -4,12 +4,15 @@ import StoriesActions from 'src/features/stories/StoriesActions';
 
 import { combineSagaHandlers } from '../redux/utils';
 import SideContentActions from '../sideContent/SideContentActions';
+import { SideContentType } from '../sideContent/SideContentTypes';
 import WorkspaceActions from '../workspace/WorkspaceActions';
 
 const isSpawnSideContent = (
   action: Action
 ): action is ReturnType<typeof SideContentActions.spawnSideContent> =>
-  action.type === SideContentActions.spawnSideContent.type;
+  action.type === SideContentActions.spawnSideContent.type ||
+  (action as any).payload?.id !== SideContentType.sessionManagement;
+// hotfix check here to allow for blinking during session update
 
 const SideContentSaga = combineSagaHandlers({
   [SideContentActions.beginAlertSideContent.type]: function* ({
diff --git a/src/commons/sideContent/SideContentTypes.ts b/src/commons/sideContent/SideContentTypes.ts
index f4598968ca..b45e457392 100644
--- a/src/commons/sideContent/SideContentTypes.ts
+++ b/src/commons/sideContent/SideContentTypes.ts
@@ -26,6 +26,7 @@ export enum SideContentType {
   questionOverview = 'question_overview',
   remoteExecution = 'remote_execution',
   scoreLeaderboard = 'score_leaderboard',
+  sessionManagement = 'session_management',
   missionMetadata = 'mission_metadata',
   mobileEditor = 'mobile_editor',
   mobileEditorRun = 'mobile_editor_run',
diff --git a/src/commons/sideContent/content/SideContentSessionManagement.tsx b/src/commons/sideContent/content/SideContentSessionManagement.tsx
new file mode 100644
index 0000000000..99c1f307ba
--- /dev/null
+++ b/src/commons/sideContent/content/SideContentSessionManagement.tsx
@@ -0,0 +1,210 @@
+import { Classes, HTMLTable, Icon, Switch } from '@blueprintjs/core';
+import { IconNames } from '@blueprintjs/icons';
+import { CollabEditingAccess, type SharedbAceUser } from '@sourceacademy/sharedb-ace/types';
+import classNames from 'classnames';
+import React, { useEffect, useState } from 'react';
+import CopyToClipboard from 'react-copy-to-clipboard';
+import { useDispatch } from 'react-redux';
+import {
+  changeDefaultEditable,
+  getPlaygroundSessionUrl
+} from 'src/commons/collabEditing/CollabEditingHelper';
+import { useTypedSelector } from 'src/commons/utils/Hooks';
+import { showSuccessMessage } from 'src/commons/utils/notifications/NotificationsHelper';
+import classes from 'src/styles/SideContentSessionManagement.module.scss';
+
+import { beginAlertSideContent } from '../SideContentActions';
+import { SideContentLocation, SideContentType } from '../SideContentTypes';
+
+interface AdminViewProps {
+  users: Record<string, SharedbAceUser>;
+  playgroundCode: string;
+  defaultReadOnly: boolean;
+}
+
+function AdminView({ users, playgroundCode }: AdminViewProps) {
+  const [toggleAll, setToggleAll] = useState<boolean>(true);
+  const [defaultRole, setDefaultRole] = useState<boolean>(true);
+  const [toggling, setToggling] = useState<{ [key: string]: boolean }>(
+    Object.fromEntries(Object.entries(users).map(([id]) => [id, true]))
+  );
+  const updateUserRoleCallback = useTypedSelector(
+    store => store.workspaces.playground.updateUserRoleCallback
+  );
+
+  const handleToggleAccess = (checked: boolean, id: string) => {
+    if (toggling[id]) return;
+    setToggling(prev => ({ ...prev, [id]: true }));
+
+    try {
+      updateUserRoleCallback(id, checked ? CollabEditingAccess.EDITOR : CollabEditingAccess.VIEWER);
+    } finally {
+      setToggling(prev => ({ ...prev, [id]: false }));
+    }
+  };
+
+  const handleAllToggleAccess = (checked: boolean) => {
+    try {
+      Object.keys(users).forEach(userId => {
+        if (userId !== 'all') {
+          updateUserRoleCallback(
+            userId,
+            checked ? CollabEditingAccess.EDITOR : CollabEditingAccess.VIEWER
+          );
+        }
+      });
+    } finally {
+      setToggleAll(checked);
+    }
+  };
+
+  const handleDefaultToggleAccess = (checked: boolean) => {
+    changeDefaultEditable(playgroundCode, !checked);
+    setDefaultRole(checked);
+    return;
+  };
+
+  return (
+    <>
+      <span className={classes['span']}>
+        Toggle all roles in current session:
+        <Switch
+          labelElement={toggleAll ? 'Editor' : 'Viewer'}
+          alignIndicator="left"
+          checked={toggleAll}
+          onChange={event => handleAllToggleAccess(event.target.checked)}
+          className={classNames(classes['switch'], classes['default-switch'])}
+        />
+      </span>
+      <br />
+      <span className={classes['span']}>
+        Default role on join:
+        <Switch
+          labelElement={defaultRole ? 'Editor' : 'Viewer'}
+          alignIndicator="left"
+          checked={defaultRole}
+          onChange={event => handleDefaultToggleAccess(event.target.checked)}
+          className={classNames(classes['switch'], classes['default-switch'])}
+        />
+      </span>
+      <HTMLTable compact className={classes['table']}>
+        <thead>
+          <tr>
+            <th>Name</th>
+            <th>Role</th>
+          </tr>
+        </thead>
+        <tbody>
+          {Object.entries(users).map(([userId, user], index) => (
+            <tr key={userId}>
+              <td className={classNames(Classes.INTERACTIVE, classes['left-cell'])}>
+                <div style={{ backgroundColor: user.color }} className={classes['user-icon']} />
+                <div>{user.name}</div>
+              </td>
+              <td className={classes['right-cell']}>
+                {user.role === CollabEditingAccess.OWNER ? (
+                  'Admin'
+                ) : (
+                  <Switch
+                    labelElement={user.role.charAt(0).toUpperCase() + user.role.slice(1)}
+                    alignIndicator="right"
+                    checked={user.role === CollabEditingAccess.EDITOR}
+                    onChange={event => handleToggleAccess(event.target.checked, userId)}
+                    className={classes['switch']}
+                  />
+                )}
+              </td>
+            </tr>
+          ))}
+        </tbody>
+      </HTMLTable>
+    </>
+  );
+}
+
+type Props = {
+  users: Record<string, SharedbAceUser>;
+  playgroundCode: string;
+  readOnly: boolean;
+  workspaceLocation: SideContentLocation;
+};
+
+const SideContentSessionManagement: React.FC<Props> = ({
+  users,
+  playgroundCode,
+  readOnly,
+  workspaceLocation
+}) => {
+  const dispatch = useDispatch();
+
+  useEffect(() => {
+    dispatch(beginAlertSideContent(SideContentType.sessionManagement, workspaceLocation));
+  }, [dispatch, workspaceLocation, users]);
+
+  if (Object.values(users).length === 0) return;
+  const myself = Object.values(users)[0];
+
+  return (
+    <div className={classes['table-container']}>
+      <span className={classes['span']}>
+        This is the session management tab. Add users by sharing the session code. If you are the
+        owner of this session, you can manage users' access levels from the table below.
+      </span>
+      <br />
+      <span className={classes['span']}>
+        Session code:
+        <CopyToClipboard
+          text={getPlaygroundSessionUrl(playgroundCode)}
+          onCopy={() =>
+            showSuccessMessage('Session url copied: ' + getPlaygroundSessionUrl(playgroundCode))
+          }
+        >
+          <div className={classes['session-code']}>
+            {getPlaygroundSessionUrl(playgroundCode)}
+            <Icon icon={IconNames.DUPLICATE} />
+          </div>
+        </CopyToClipboard>
+      </span>
+      <br />
+      <span className={classes['span']}>
+        Number of users in the session: {Object.entries(users).length}
+      </span>
+      <div className="session-management-table">
+        {myself.role === CollabEditingAccess.OWNER ? (
+          <AdminView users={users} defaultReadOnly={readOnly} playgroundCode={playgroundCode} />
+        ) : (
+          <HTMLTable compact className={classes['table']}>
+            <thead>
+              <tr>
+                <th>Name</th>
+                <th>Role</th>
+              </tr>
+            </thead>
+            <tbody>
+              {Object.values(users).map((user, index) => {
+                return (
+                  <tr key={user.color}>
+                    <td className={classNames(Classes.INTERACTIVE, classes['left-cell'])}>
+                      <div
+                        style={{ backgroundColor: user.color }}
+                        className={classes['user-icon']}
+                      />
+                      <div>{user.name}</div>
+                    </td>
+                    <td className={classNames(Classes.INTERACTIVE, classes['right-cell'])}>
+                      {user.role === CollabEditingAccess.OWNER
+                        ? 'Admin'
+                        : user.role.charAt(0).toUpperCase() + user.role.slice(1)}
+                    </td>
+                  </tr>
+                );
+              })}
+            </tbody>
+          </HTMLTable>
+        )}
+      </div>
+    </div>
+  );
+};
+
+export default SideContentSessionManagement;
diff --git a/src/commons/sideContent/content/SideContentSubstVisualizer.tsx b/src/commons/sideContent/content/SideContentSubstVisualizer.tsx
index a6c4cad72d..7de22e6ac1 100644
--- a/src/commons/sideContent/content/SideContentSubstVisualizer.tsx
+++ b/src/commons/sideContent/content/SideContentSubstVisualizer.tsx
@@ -94,7 +94,6 @@ type SubstVisualizerPropsAST = {
 };
 
 const SideContentSubstVisualizer: React.FC<SubstVisualizerPropsAST> = props => {
-  console.log(props);
   const [stepValue, setStepValue] = useState(1);
   const lastStepValue = props.content.length;
   const hasRunCode = lastStepValue !== 0;
diff --git a/src/commons/utils/AceHelper.ts b/src/commons/utils/AceHelper.ts
index 7e958f124c..e023b7ee38 100644
--- a/src/commons/utils/AceHelper.ts
+++ b/src/commons/utils/AceHelper.ts
@@ -2,6 +2,7 @@ import { HighlightRulesSelector, ModeSelector } from 'js-slang/dist/editors/ace/
 import { Chapter, Variant } from 'js-slang/dist/types';
 
 import { HighlightRulesSelector_native } from '../../features/fullJS/fullJSHighlight';
+import { ExternalLibraryName } from '../application/types/ExternalTypes';
 import { Documentation } from '../documentation/Documentation';
 /**
  * This _modifies global state_ and defines a new Ace mode globally, if it does not already exist.
@@ -67,3 +68,62 @@ export const getModeString = (chapter: Chapter, variant: Variant, library: strin
       return `source${chapter}${variant}${library}`;
   }
 };
+
+export const parseModeString = (
+  modeString: string
+): { chapter: Chapter; variant: Variant; library: ExternalLibraryName } => {
+  switch (modeString) {
+    case 'html':
+      return { chapter: Chapter.HTML, variant: Variant.DEFAULT, library: ExternalLibraryName.NONE };
+    case 'typescript':
+      return {
+        chapter: Chapter.FULL_TS,
+        variant: Variant.DEFAULT,
+        library: ExternalLibraryName.NONE
+      };
+    case 'python':
+      return {
+        chapter: Chapter.PYTHON_1,
+        variant: Variant.DEFAULT,
+        library: ExternalLibraryName.NONE
+      };
+    case 'scheme':
+      return {
+        chapter: Chapter.FULL_SCHEME,
+        variant: Variant.EXPLICIT_CONTROL,
+        library: ExternalLibraryName.NONE
+      };
+    case 'java':
+      return {
+        chapter: Chapter.FULL_JAVA,
+        variant: Variant.DEFAULT,
+        library: ExternalLibraryName.NONE
+      };
+    case 'c_cpp':
+      return {
+        chapter: Chapter.FULL_C,
+        variant: Variant.DEFAULT,
+        library: ExternalLibraryName.NONE
+      };
+    default:
+      const matches = modeString.match(/source(-?\d+)([a-z\-]+)([A-Z]+)/);
+      if (!matches) {
+        throw new Error('Invalid modeString');
+      }
+      const [_, chapter, variant, externalLibraryName] = matches;
+      return {
+        chapter:
+          chapter === '1'
+            ? Chapter.SOURCE_1
+            : chapter === '2'
+              ? Chapter.SOURCE_2
+              : chapter === '3'
+                ? Chapter.SOURCE_3
+                : Chapter.SOURCE_4,
+        variant: Variant[variant as keyof typeof Variant] || Variant.DEFAULT,
+        library:
+          ExternalLibraryName[externalLibraryName as keyof typeof ExternalLibraryName] ||
+          ExternalLibraryName.NONE
+      };
+  }
+};
diff --git a/src/commons/utils/Constants.ts b/src/commons/utils/Constants.ts
index e5cc2c8c22..0ee626e184 100644
--- a/src/commons/utils/Constants.ts
+++ b/src/commons/utils/Constants.ts
@@ -42,6 +42,7 @@ const sicpBackendUrl =
   process.env.REACT_APP_SICPJS_BACKEND_URL || 'https://sicp.sourceacademy.org/';
 const javaPackagesUrl = 'https://source-academy.github.io/modules/java/java-packages/src/';
 const workspaceSettingsLocalStorageKey = 'workspace-settings';
+const collabSessionIdLocalStorageKey = 'playground-session-id';
 
 // For achievements feature (CA - Continual Assessment)
 // TODO: remove dependency of the ca levels on the env file
@@ -183,6 +184,7 @@ const Constants = {
   sicpBackendUrl,
   javaPackagesUrl,
   workspaceSettingsLocalStorageKey,
+  collabSessionIdLocalStorageKey,
   caFulfillmentLevel,
   featureFlags
 };
diff --git a/src/commons/utils/StoriesHelper.ts b/src/commons/utils/StoriesHelper.ts
index 3f74db64f1..4e78351793 100644
--- a/src/commons/utils/StoriesHelper.ts
+++ b/src/commons/utils/StoriesHelper.ts
@@ -1,7 +1,11 @@
 import { h } from 'hastscript';
+import { Nodes as MdastNodes } from 'mdast';
 import { fromMarkdown } from 'mdast-util-from-markdown';
-import { defaultHandlers, toHast } from 'mdast-util-to-hast';
-import { MdastNodes, Options as MdastToHastConverterOptions } from 'mdast-util-to-hast/lib';
+import {
+  defaultHandlers,
+  Options as MdastToHastConverterOptions,
+  toHast
+} from 'mdast-util-to-hast';
 import React from 'react';
 import * as runtime from 'react/jsx-runtime';
 import { IEditorProps } from 'react-ace';
diff --git a/src/commons/workspace/WorkspaceReducer.ts b/src/commons/workspace/WorkspaceReducer.ts
index 7e4f241ea9..59fef33b93 100644
--- a/src/commons/workspace/WorkspaceReducer.ts
+++ b/src/commons/workspace/WorkspaceReducer.ts
@@ -1,4 +1,5 @@
 import { createReducer, type Reducer } from '@reduxjs/toolkit';
+import { castDraft } from 'immer';
 
 import { SourcecastReducer } from '../../features/sourceRecorder/sourcecast/SourcecastReducer';
 import { SourcereelReducer } from '../../features/sourceRecorder/sourcereel/SourcereelReducer';
@@ -15,7 +16,8 @@ import {
 import {
   setEditorSessionId,
   setSessionDetails,
-  setSharedbConnected
+  setSharedbConnected,
+  setUpdateUserRoleCallback
 } from '../collabEditing/CollabEditingActions';
 import type { SourceActionType } from '../utils/ActionsHelper';
 import { createContext } from '../utils/JsSlangHelper';
@@ -138,10 +140,10 @@ const newWorkspaceReducer = createReducer(defaultWorkspaceManager, builder => {
     .addCase(logOut, (state, action) => {
       // Preserve the playground workspace even after log out
       const playgroundWorkspace = state.playground;
-      return {
+      return castDraft({
         ...defaultWorkspaceManager,
         playground: playgroundWorkspace
-      };
+      });
     })
     .addCase(WorkspaceActions.enableTokenCounter, (state, action) => {
       const workspaceLocation = getWorkspaceLocation(action);
@@ -308,7 +310,16 @@ const newWorkspaceReducer = createReducer(defaultWorkspaceManager, builder => {
     })
     .addCase(setSessionDetails, (state, action) => {
       const workspaceLocation = getWorkspaceLocation(action);
-      state[workspaceLocation].sessionDetails = action.payload.sessionDetails;
+      return {
+        ...state,
+        [workspaceLocation]: {
+          ...state[workspaceLocation],
+          sessionDetails: {
+            ...state[workspaceLocation].sessionDetails,
+            ...action.payload.sessionDetails
+          }
+        }
+      };
     })
     .addCase(WorkspaceActions.setIsEditorReadonly, (state, action) => {
       const workspaceLocation = getWorkspaceLocation(action);
@@ -378,5 +389,9 @@ const newWorkspaceReducer = createReducer(defaultWorkspaceManager, builder => {
     .addCase(WorkspaceActions.updateLastDebuggerResult, (state, action) => {
       const workspaceLocation = getWorkspaceLocation(action);
       state[workspaceLocation].lastDebuggerResult = action.payload.lastDebuggerResult;
+    })
+    .addCase(setUpdateUserRoleCallback, (state, action) => {
+      const workspaceLocation = getWorkspaceLocation(action);
+      state[workspaceLocation].updateUserRoleCallback = action.payload.updateUserRoleCallback;
     });
 });
diff --git a/src/commons/workspace/WorkspaceTypes.ts b/src/commons/workspace/WorkspaceTypes.ts
index ea9f137a9e..5511dec4d2 100644
--- a/src/commons/workspace/WorkspaceTypes.ts
+++ b/src/commons/workspace/WorkspaceTypes.ts
@@ -1,3 +1,4 @@
+import type { CollabEditingAccess } from '@sourceacademy/sharedb-ace/types';
 import type { Context } from 'js-slang';
 
 import type {
@@ -85,7 +86,7 @@ export type WorkspaceState = {
   readonly programPrependValue: string;
   readonly programPostpendValue: string;
   readonly editorSessionId: string;
-  readonly sessionDetails: { docId: string; readOnly: boolean } | null;
+  readonly sessionDetails: { docId: string; readOnly: boolean; owner: boolean } | null;
   readonly editorTestcases: Testcase[];
   readonly execTime: number;
   readonly isRunning: boolean;
@@ -106,6 +107,7 @@ export type WorkspaceState = {
   readonly debuggerContext: DebuggerContext;
   readonly lastDebuggerResult: any;
   readonly files: UploadResult;
+  readonly updateUserRoleCallback: (id: string, newRole: CollabEditingAccess) => void;
 };
 
 type ReplHistory = {
diff --git a/src/commons/workspace/sharedb-ace.d.ts b/src/commons/workspace/sharedb-ace.d.ts
deleted file mode 100644
index cc0d68acbf..0000000000
--- a/src/commons/workspace/sharedb-ace.d.ts
+++ /dev/null
@@ -1 +0,0 @@
-declare module '@sourceacademy/sharedb-ace';
diff --git a/src/features/sourceRecorder/SourceRecorderTypes.ts b/src/features/sourceRecorder/SourceRecorderTypes.ts
index 74030ea2cd..016c501746 100644
--- a/src/features/sourceRecorder/SourceRecorderTypes.ts
+++ b/src/features/sourceRecorder/SourceRecorderTypes.ts
@@ -1,4 +1,4 @@
-import { Ace } from 'ace-builds/ace';
+import { Ace } from 'ace-builds';
 import { Chapter } from 'js-slang/dist/types';
 
 import { ExternalLibraryName } from '../../commons/application/types/ExternalTypes';
diff --git a/src/features/sourceRecorder/sourcecast/SourcecastReducer.ts b/src/features/sourceRecorder/sourcecast/SourcecastReducer.ts
index f47bf97f78..1ebd9eb34e 100644
--- a/src/features/sourceRecorder/sourcecast/SourcecastReducer.ts
+++ b/src/features/sourceRecorder/sourcecast/SourcecastReducer.ts
@@ -1,4 +1,5 @@
 import { createReducer } from '@reduxjs/toolkit';
+import { castDraft } from 'immer';
 import { defaultWorkspaceManager } from 'src/commons/application/ApplicationTypes';
 
 import * as SourceRecorderActions from '../SourceRecorderActions';
@@ -11,23 +12,23 @@ export const SourcecastReducer = createReducer(defaultWorkspaceManager.sourcecas
       state.description = action.payload.description;
       state.uid = action.payload.uid;
       state.audioUrl = action.payload.audioUrl;
-      state.playbackData = action.payload.playbackData;
+      state.playbackData = castDraft(action.payload.playbackData);
     })
     .addCase(SourceRecorderActions.setCurrentPlayerTime, (state, action) => {
       state.currentPlayerTime = action.payload.playerTime;
     })
     .addCase(SourceRecorderActions.setCodeDeltasToApply, (state, action) => {
-      state.codeDeltasToApply = action.payload.deltas;
+      state.codeDeltasToApply = castDraft(action.payload.deltas);
     })
     .addCase(SourceRecorderActions.setInputToApply, (state, action) => {
-      state.inputToApply = action.payload.inputToApply;
+      state.inputToApply = castDraft(action.payload.inputToApply);
     })
     .addCase(SourceRecorderActions.setSourcecastData, (state, action) => {
       state.title = action.payload.title;
       state.description = action.payload.description;
       state.uid = action.payload.uid;
       state.audioUrl = action.payload.audioUrl;
-      state.playbackData = action.payload.playbackData;
+      state.playbackData = castDraft(action.payload.playbackData);
     })
     .addCase(SourceRecorderActions.setSourcecastDuration, (state, action) => {
       state.playbackDuration = action.payload.duration;
diff --git a/src/features/sourceRecorder/sourcereel/SourcereelReducer.ts b/src/features/sourceRecorder/sourcereel/SourcereelReducer.ts
index b3637def5e..b9ecafb672 100644
--- a/src/features/sourceRecorder/sourcereel/SourcereelReducer.ts
+++ b/src/features/sourceRecorder/sourcereel/SourcereelReducer.ts
@@ -1,4 +1,5 @@
 import { createReducer } from '@reduxjs/toolkit';
+import { castDraft } from 'immer';
 import { defaultWorkspaceManager } from 'src/commons/application/ApplicationTypes';
 
 import { RecordingStatus } from '../SourceRecorderTypes';
@@ -11,10 +12,10 @@ export const SourcereelReducer = createReducer(defaultWorkspaceManager.sourceree
       state.playbackData.inputs = [];
     })
     .addCase(SourcereelActions.recordInput, (state, action) => {
-      state.playbackData.inputs.push(action.payload.input);
+      state.playbackData.inputs.push(castDraft(action.payload.input));
     })
     .addCase(SourcereelActions.resetInputs, (state, action) => {
-      state.playbackData.inputs = action.payload.inputs;
+      state.playbackData.inputs = castDraft(action.payload.inputs);
     })
     .addCase(SourcereelActions.timerPause, (state, action) => {
       state.recordingStatus = RecordingStatus.paused;
diff --git a/src/pages/academy/adminPanel/subcomponents/assessmentConfigPanel/AssessmentConfigPanel.tsx b/src/pages/academy/adminPanel/subcomponents/assessmentConfigPanel/AssessmentConfigPanel.tsx
index ef091afd65..d00ef3cd92 100644
--- a/src/pages/academy/adminPanel/subcomponents/assessmentConfigPanel/AssessmentConfigPanel.tsx
+++ b/src/pages/academy/adminPanel/subcomponents/assessmentConfigPanel/AssessmentConfigPanel.tsx
@@ -267,7 +267,8 @@ const AssessmentConfigPanel: WithImperativeApi<
         setHasVotingFeatures,
         setHoursBeforeDecay,
         setIsGradingAutoPublished,
-        setIsManuallyGraded
+        setIsManuallyGraded,
+        setIsMinigame
       ]
     );
 
diff --git a/src/pages/playground/Playground.tsx b/src/pages/playground/Playground.tsx
index c85310f359..b664d3b24d 100644
--- a/src/pages/playground/Playground.tsx
+++ b/src/pages/playground/Playground.tsx
@@ -2,6 +2,7 @@ import { Classes } from '@blueprintjs/core';
 import { IconNames } from '@blueprintjs/icons';
 import { type HotkeyItem, useHotkeys } from '@mantine/hooks';
 import type { AnyAction, Dispatch } from '@reduxjs/toolkit';
+import type { SharedbAceUser } from '@sourceacademy/sharedb-ace/types';
 import { Ace, Range } from 'ace-builds';
 import type { FSModule } from 'browserfs/dist/node/core/FS';
 import classNames from 'classnames';
@@ -91,6 +92,7 @@ import {
   desktopOnlyTabIds,
   makeIntroductionTabFrom,
   makeRemoteExecutionTabFrom,
+  makeSessionManagementTabFrom,
   makeSubstVisualizerTabFrom,
   mobileOnlyTabIds
 } from './PlaygroundTabs';
@@ -283,6 +285,7 @@ const Playground: React.FC<PlaygroundProps> = props => {
       chapter: playgroundSourceChapter
     })
   );
+  const [users, setUsers] = useState<Record<string, SharedbAceUser>>({});
 
   // Playground hotkeys
   const [isGreen, setIsGreen] = useState(false);
@@ -297,6 +300,10 @@ const Playground: React.FC<PlaygroundProps> = props => {
     [deviceSecret]
   );
 
+  const sessionManagementTab: SideContentTab = useMemo(() => {
+    return makeSessionManagementTabFrom(users, editorSessionId, sessionDetails?.readOnly || false);
+  }, [users, editorSessionId, sessionDetails?.readOnly]);
+
   const usingRemoteExecution =
     useTypedSelector(state => !!state.session.remoteExecutionSession) && !isSicpEditor;
   // this is still used by remote execution (EV3)
@@ -663,25 +670,36 @@ const Playground: React.FC<PlaygroundProps> = props => {
     [store, workspaceLocation]
   );
 
+  const handleSetEditorSessionId = useCallback(
+    (id: string) => dispatch(setEditorSessionId(workspaceLocation, id)),
+    [dispatch, workspaceLocation]
+  );
+
+  const handleSetSessionDetails = useCallback(
+    (details: { docId: string; readOnly: boolean; owner: boolean } | null) =>
+      dispatch(setSessionDetails(workspaceLocation, details)),
+    [dispatch, workspaceLocation]
+  );
+
   const sessionButtons = useMemo(
     () => (
       <ControlBarSessionButtons
         isFolderModeEnabled={isFolderModeEnabled}
         editorSessionId={editorSessionId}
         getEditorValue={getEditorValue}
-        handleSetEditorSessionId={id => dispatch(setEditorSessionId(workspaceLocation, id))}
-        handleSetSessionDetails={details => dispatch(setSessionDetails(workspaceLocation, details))}
+        handleSetEditorSessionId={handleSetEditorSessionId}
+        handleSetSessionDetails={handleSetSessionDetails}
         sharedbConnected={sharedbConnected}
         key="session"
       />
     ),
     [
-      dispatch,
-      getEditorValue,
       isFolderModeEnabled,
       editorSessionId,
-      sharedbConnected,
-      workspaceLocation
+      getEditorValue,
+      handleSetEditorSessionId,
+      handleSetSessionDetails,
+      sharedbConnected
     ]
   );
 
@@ -775,21 +793,26 @@ const Playground: React.FC<PlaygroundProps> = props => {
 
     if (!isSicpEditor && !Constants.playgroundOnly) {
       tabs.push(remoteExecutionTab);
+      if (editorSessionId !== '') {
+        tabs.push(sessionManagementTab);
+      }
     }
 
     return tabs;
   }, [
     playgroundIntroductionTab,
     languageConfig.chapter,
-    output,
     usingRemoteExecution,
     isSicpEditor,
-    dispatch,
+    output,
     workspaceLocation,
+    dispatch,
     shouldShowDataVisualizer,
     shouldShowCseMachine,
     shouldShowSubstVisualizer,
-    remoteExecutionTab
+    remoteExecutionTab,
+    editorSessionId,
+    sessionManagementTab
   ]);
 
   // Remove Intro and Remote Execution tabs for mobile
@@ -933,7 +956,9 @@ const Playground: React.FC<PlaygroundProps> = props => {
     externalLibraryName,
     sourceVariant: languageConfig.variant,
     handleEditorValueChange: onEditorValueChange,
-    handleEditorUpdateBreakpoints: handleEditorUpdateBreakpoints
+    handleEditorUpdateBreakpoints: handleEditorUpdateBreakpoints,
+    setUsers,
+    updateLanguageCallback: chapterSelectHandler
   };
 
   const replHandlers = useMemo(() => {
diff --git a/src/pages/playground/PlaygroundTabs.tsx b/src/pages/playground/PlaygroundTabs.tsx
index 95aac5c5da..518688df62 100644
--- a/src/pages/playground/PlaygroundTabs.tsx
+++ b/src/pages/playground/PlaygroundTabs.tsx
@@ -1,7 +1,9 @@
 import { IconNames } from '@blueprintjs/icons';
+import type { SharedbAceUser } from '@sourceacademy/sharedb-ace/types';
 import { InterpreterOutput } from 'src/commons/application/ApplicationTypes';
 import Markdown from 'src/commons/Markdown';
 import SideContentRemoteExecution from 'src/commons/sideContent/content/remoteExecution/SideContentRemoteExecution';
+import SideContentSessionManagement from 'src/commons/sideContent/content/SideContentSessionManagement';
 import SideContentSubstVisualizer from 'src/commons/sideContent/content/SideContentSubstVisualizer';
 import {
   SideContentLocation,
@@ -22,6 +24,24 @@ export const makeIntroductionTabFrom = (content: string): SideContentTab => ({
   id: SideContentType.introduction
 });
 
+export const makeSessionManagementTabFrom = (
+  users: Record<string, SharedbAceUser>,
+  playgroundCode: string,
+  readOnly: boolean
+): SideContentTab => ({
+  label: 'Session Management',
+  iconName: IconNames.PEOPLE,
+  body: (
+    <SideContentSessionManagement
+      users={users}
+      playgroundCode={playgroundCode}
+      readOnly={readOnly}
+      workspaceLocation="playground"
+    />
+  ),
+  id: SideContentType.sessionManagement
+});
+
 export const makeRemoteExecutionTabFrom = (
   deviceSecret: string | undefined,
   callback: React.Dispatch<React.SetStateAction<string | undefined>>
diff --git a/src/pages/sicp/subcomponents/__tests__/SicpExercise.tsx b/src/pages/sicp/subcomponents/__tests__/SicpExercise.tsx
index 0c499b7936..5f369b132b 100644
--- a/src/pages/sicp/subcomponents/__tests__/SicpExercise.tsx
+++ b/src/pages/sicp/subcomponents/__tests__/SicpExercise.tsx
@@ -1,6 +1,6 @@
 import { render, screen } from '@testing-library/react';
+import type { UserEvent } from '@testing-library/user-event';
 import userEvent from '@testing-library/user-event';
-import { UserEvent } from '@testing-library/user-event/dist/types/setup/setup';
 import { renderTreeJson } from 'src/commons/utils/TestUtils';
 
 import SicpExercise, { noSolutionPlaceholder } from '../SicpExercise';
diff --git a/src/routes/routerConfig.tsx b/src/routes/routerConfig.tsx
index 4c13425b43..97582096ff 100644
--- a/src/routes/routerConfig.tsx
+++ b/src/routes/routerConfig.tsx
@@ -138,7 +138,7 @@ export const getFullAcademyRouterConfig = ({
         { path: 'welcome', lazy: Welcome, loader: welcomeLoader },
         { path: 'courses', element: <Navigate to="/" /> },
         ensureUserAndRole({ path: 'courses/:courseId/*', lazy: Academy, children: academyRoutes }),
-        ensureUserAndRole({ path: 'playground', lazy: Playground }),
+        ensureUserAndRole({ path: 'playground/:playgroundCode?', lazy: Playground }),
         { path: 'mission-control/:assessmentId?/:questionId?', lazy: MissionControl },
         ensureUserAndRole({ path: 'courses/:courseId/stories/new', lazy: EditStory }),
         ensureUserAndRole({ path: 'courses/:courseId/stories/view/:id', lazy: ViewStory }),
diff --git a/src/styles/SideContentSessionManagement.module.scss b/src/styles/SideContentSessionManagement.module.scss
new file mode 100644
index 0000000000..bf443ee438
--- /dev/null
+++ b/src/styles/SideContentSessionManagement.module.scss
@@ -0,0 +1,69 @@
+@import '_global';
+@import '@blueprintjs/core/lib/scss/variables';
+
+.span {
+  display: inline-flex;
+  margin-block: 0.5rem;
+}
+
+.left-cell {
+  min-height: 40px;
+  display: flex;
+  align-items: center;
+}
+
+.right-cell {
+  vertical-align: middle !important;
+}
+
+.switch {
+  margin-bottom: 0px;
+}
+
+.default-switch {
+  display: inline-block;
+  margin-left: 5px;
+}
+
+.table {
+  padding-inline: 0px !important;
+}
+
+.table-container {
+  padding-top: 1rem;
+  padding-inline: 1rem;
+}
+
+.session-code {
+  color: $blue4;
+  margin-left: 5px;
+  display: flex;
+  column-gap: 5px;
+}
+
+.session-code:hover {
+  cursor: pointer;
+  color: $blue5;
+}
+
+.user-icon {
+  margin-right: 5px;
+}
+
+.side-content-tab-alert {
+  -webkit-animation: alert 1s infinite;
+  -moz-animation: alert 1s infinite;
+  -o-animation: alert 1s infinite;
+  animation: alert 1s infinite;
+}
+
+@keyframes alert {
+  0%,
+  50% {
+    background-color: rgba(200, 100, 50, 0.5);
+  }
+  51%,
+  100% {
+    background-image: rgba(138, 155, 168, 0.3);
+  }
+}
diff --git a/src/styles/_workspace.scss b/src/styles/_workspace.scss
index df4cbddc40..08c7e4da9d 100755
--- a/src/styles/_workspace.scss
+++ b/src/styles/_workspace.scss
@@ -745,6 +745,34 @@ $code-color-notification: #f9f0d7;
     }
   }
 
+  .session-management-table {
+    table {
+      width: 100%;
+      padding-inline: 0.5em;
+      border-spacing: 0 0.5em;
+
+      th:last-child,
+      td:last-child {
+        width: auto;
+      }
+
+      td:first-child {
+        display: flex;
+        flex-direction: row;
+        gap: 5px;
+        width: 100%;
+      }
+
+      td {
+        div:first-child {
+          width: 15px;
+          height: 15px;
+          border-radius: 50%;
+        }
+      }
+    }
+  }
+
   .react-mde {
     /* Colour the borders */
     border-color: #1b2530;
@@ -913,6 +941,8 @@ $code-color-notification: #f9f0d7;
       background: $cadet-color-3;
       color: rgb(128, 145, 160);
     }
+    display: inline-block;
+    flex: 1;
   }
 
   .react-ace-green {
@@ -922,6 +952,22 @@ $code-color-notification: #f9f0d7;
       background: $dark-green;
       color: rgb(128, 145, 160);
     }
+    display: inline-block;
+    flex: 1;
+  }
+
+  #ace-radar-view {
+    display: inline-block;
+    max-width: 2%;
+    background: #2f3129;
+  }
+
+  .ace-radar-view-cursor-indicator {
+    display: none;
+  }
+
+  .ace-radar-view-wrapper {
+    width: 1px;
   }
 
   .Autograder,
diff --git a/tsconfig.json b/tsconfig.json
index c988d3f032..2d499116a9 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,7 +10,7 @@
     "jsx": "react-jsx",
     "strict": true,
     "useUnknownInCatchVariables": false,
-    "moduleResolution": "node",
+    "moduleResolution": "bundler",
     "rootDir": "src",
     "forceConsistentCasingInFileNames": true,
     "noImplicitReturns": true,
diff --git a/yarn.lock b/yarn.lock
index ffff2f0728..59a5f3c93e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -103,20 +103,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/generator@npm:^7.27.5, @babel/generator@npm:^7.7.2":
-  version: 7.27.5
-  resolution: "@babel/generator@npm:7.27.5"
-  dependencies:
-    "@babel/parser": "npm:^7.27.5"
-    "@babel/types": "npm:^7.27.3"
-    "@jridgewell/gen-mapping": "npm:^0.3.5"
-    "@jridgewell/trace-mapping": "npm:^0.3.25"
-    jsesc: "npm:^3.0.2"
-  checksum: 10c0/8f649ef4cd81765c832bb11de4d6064b035ffebdecde668ba7abee68a7b0bce5c9feabb5dc5bb8aeba5bd9e5c2afa3899d852d2bd9ca77a711ba8c8379f416f0
-  languageName: node
-  linkType: hard
-
-"@babel/generator@npm:^7.28.0":
+"@babel/generator@npm:^7.28.0, @babel/generator@npm:^7.7.2":
   version: 7.28.0
   resolution: "@babel/generator@npm:7.28.0"
   dependencies:
@@ -330,18 +317,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/parser@npm:^7.1.0, @babel/parser@npm:^7.14.7, @babel/parser@npm:^7.19.4, @babel/parser@npm:^7.20.7, @babel/parser@npm:^7.23.9, @babel/parser@npm:^7.27.2, @babel/parser@npm:^7.27.5, @babel/parser@npm:^7.27.7":
-  version: 7.27.7
-  resolution: "@babel/parser@npm:7.27.7"
-  dependencies:
-    "@babel/types": "npm:^7.27.7"
-  bin:
-    parser: ./bin/babel-parser.js
-  checksum: 10c0/f6202faeb873f0b3083022e50a5046fe07266d337c0a3bd80a491f8435ba6d9e383d49725e3dcd666b3b52c0dccb4e0f1f1004915762345f7eeed5ba54ea9fd2
-  languageName: node
-  linkType: hard
-
-"@babel/parser@npm:^7.28.0":
+"@babel/parser@npm:^7.1.0, @babel/parser@npm:^7.14.7, @babel/parser@npm:^7.19.4, @babel/parser@npm:^7.20.7, @babel/parser@npm:^7.23.9, @babel/parser@npm:^7.27.2, @babel/parser@npm:^7.28.0":
   version: 7.28.0
   resolution: "@babel/parser@npm:7.28.0"
   dependencies:
@@ -1436,22 +1412,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/traverse@npm:^7.27.1, @babel/traverse@npm:^7.27.3":
-  version: 7.27.7
-  resolution: "@babel/traverse@npm:7.27.7"
-  dependencies:
-    "@babel/code-frame": "npm:^7.27.1"
-    "@babel/generator": "npm:^7.27.5"
-    "@babel/parser": "npm:^7.27.7"
-    "@babel/template": "npm:^7.27.2"
-    "@babel/types": "npm:^7.27.7"
-    debug: "npm:^4.3.1"
-    globals: "npm:^11.1.0"
-  checksum: 10c0/941fecd0248546f059d58230590a2765d128ef072c8521c9e0bcf6037abf28a0ea4736003d0d695513128d07fe00a7bc57acaada2ed905941d44619b9f49cf0c
-  languageName: node
-  linkType: hard
-
-"@babel/traverse@npm:^7.28.0":
+"@babel/traverse@npm:^7.27.1, @babel/traverse@npm:^7.27.3, @babel/traverse@npm:^7.28.0":
   version: 7.28.0
   resolution: "@babel/traverse@npm:7.28.0"
   dependencies:
@@ -1466,17 +1427,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/types@npm:^7.0.0, @babel/types@npm:^7.20.7, @babel/types@npm:^7.21.0, @babel/types@npm:^7.21.3, @babel/types@npm:^7.27.1, @babel/types@npm:^7.27.3, @babel/types@npm:^7.27.6, @babel/types@npm:^7.27.7, @babel/types@npm:^7.3.0, @babel/types@npm:^7.3.3, @babel/types@npm:^7.4.4":
-  version: 7.27.7
-  resolution: "@babel/types@npm:7.27.7"
-  dependencies:
-    "@babel/helper-string-parser": "npm:^7.27.1"
-    "@babel/helper-validator-identifier": "npm:^7.27.1"
-  checksum: 10c0/1d1dcb5fa7cfba2b4034a3ab99ba17049bfc4af9e170935575246cdb1cee68b04329a0111506d9ae83fb917c47dbd4394a6db5e32fbd041b7834ffbb17ca086b
-  languageName: node
-  linkType: hard
-
-"@babel/types@npm:^7.28.0":
+"@babel/types@npm:^7.0.0, @babel/types@npm:^7.20.7, @babel/types@npm:^7.21.0, @babel/types@npm:^7.21.3, @babel/types@npm:^7.27.1, @babel/types@npm:^7.27.3, @babel/types@npm:^7.27.6, @babel/types@npm:^7.28.0, @babel/types@npm:^7.3.0, @babel/types@npm:^7.3.3, @babel/types@npm:^7.4.4":
   version: 7.28.1
   resolution: "@babel/types@npm:7.28.1"
   dependencies:
@@ -2351,7 +2302,7 @@ __metadata:
   languageName: node
   linkType: hard
 
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-"@jridgewell/gen-mapping@npm:^0.3.5":
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-  resolution: "@jridgewell/gen-mapping@npm:0.3.5"
-  dependencies:
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-    "@jridgewell/sourcemap-codec": "npm:^1.4.10"
-    "@jridgewell/trace-mapping": "npm:^0.3.24"
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-"@jridgewell/set-array@npm:^1.0.0, @jridgewell/set-array@npm:^1.2.1":
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-  version: 2.0.3
-  resolution: "@sourceacademy/sharedb-ace@npm:2.0.3"
+"@sourceacademy/sharedb-ace@npm:^2.1.0":
+  version: 2.1.0
+  resolution: "@sourceacademy/sharedb-ace@npm:2.1.0"
   dependencies:
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     event-emitter-es6: "npm:^1.1.5"
     logdown: "npm:^3.3.1"
-    reconnecting-websocket: "npm:^4.4.0"
-    sharedb: "npm:^1.4.1"
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+    partysocket: "npm:^1.0.3"
+    sharedb: "npm:^5.1.1"
+  checksum: 10c0/c66efa6085f9ec8639164a5a291dd929cb84bf4d44dd72fe534099fadd68aa126b59e95d451585c35d33c14d55c3297649f3720522d4d35f1fe29bbeb03758ae
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   resolution: "@testing-library/user-event@npm:14.6.1"
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   resolution: "@types/yargs@npm:17.0.33"
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-"@types/yargs@npm:^17.0.8":
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-  resolution: "@types/yargs@npm:17.0.32"
-  dependencies:
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-  languageName: node
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   resolution: "@typescript-eslint/eslint-plugin@npm:8.36.0"
@@ -4644,10 +4559,10 @@ __metadata:
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-"ace-builds@npm:^1.36.3, ace-builds@npm:^1.4.12":
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+  resolution: "ace-builds@npm:1.43.0"
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-"async@npm:^3.2.3":
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@@ -7385,6 +7300,13 @@ __metadata:
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+"event-target-polyfill@npm:^0.0.4":
+  version: 0.0.4
+  resolution: "event-target-polyfill@npm:0.0.4"
+  checksum: 10c0/7052b838df6509e8290f110daf94604dd05828834db4ad6fe4a12abc693da1a3274100cfd4ff3e47a941d5aa3fb7cdb8164d85402b93d85340bb3adc596d8732
+  languageName: node
+  linkType: hard
+
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   version: 5.0.1
   resolution: "event-target-shim@npm:5.0.1"
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-"fast-deep-equal@npm:^2.0.1":
-  version: 2.0.1
-  resolution: "fast-deep-equal@npm:2.0.1"
-  checksum: 10c0/1602e0d6ed63493c865cc6b03f9070d6d3926e8cd086a123060b58f80a295f3f08b1ecfb479ae7c45b7fd45535202aea7cf5b49bc31bffb81c20b1502300be84
-  languageName: node
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   resolution: "fast-deep-equal@npm:3.1.3"
@@ -7760,7 +7675,7 @@ __metadata:
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     "@sentry/browser": "npm:^8.33.0"
     "@sourceacademy/c-slang": "npm:^1.0.21"
-    "@sourceacademy/sharedb-ace": "npm:^2.0.3"
+    "@sourceacademy/sharedb-ace": "npm:^2.1.0"
     "@sourceacademy/sling-client": "npm:^0.1.0"
     "@svgr/webpack": "npm:^8.0.0"
     "@swc/core": "npm:^1.11.22"
@@ -7770,7 +7685,7 @@ __metadata:
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     "@testing-library/jest-dom": "npm:^6.0.0"
     "@testing-library/react": "npm:^16.0.0"
-    "@testing-library/user-event": "npm:^14.4.3"
+    "@testing-library/user-event": "npm:^14.6.0"
     "@tremor/react": "npm:^1.8.2"
     "@types/estree": "npm:^1.0.5"
     "@types/gapi": "npm:^0.0.47"
@@ -7792,7 +7707,7 @@ __metadata:
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     "@types/showdown": "npm:^2.0.1"
     "@types/xml2js": "npm:^0.4.11"
-    ace-builds: "npm:^1.36.3"
+    ace-builds: "npm:^1.42.1"
     acorn: "npm:^8.9.0"
     ag-grid-community: "npm:^32.3.1"
     ag-grid-react: "npm:^32.3.1"
@@ -7821,6 +7736,7 @@ __metadata:
     i18next: "npm:^25.0.0"
     i18next-browser-languagedetector: "npm:^8.0.0"
     identity-obj-proxy: "npm:^3.0.0"
+    immer: "npm:^10.1.1"
     java-slang: "npm:^1.0.13"
     jest: "npm:^29.7.0"
     jest-environment-jsdom: "npm:^29.7.0"
@@ -8605,6 +8521,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"immer@npm:^10.1.1":
+  version: 10.1.1
+  resolution: "immer@npm:10.1.1"
+  checksum: 10c0/b749e10d137ccae91788f41bd57e9387f32ea6d6ea8fd7eb47b23fd7766681575efc7f86ceef7fe24c3bc9d61e38ff5d2f49c2663b2b0c056e280a4510923653
+  languageName: node
+  linkType: hard
+
 "immer@npm:^9.0.21":
   version: 9.0.21
   resolution: "immer@npm:9.0.21"
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-"ot-json0@npm:^1.0.1":
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@@ -11381,6 +11304,15 @@ __metadata:
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+"partysocket@npm:^1.0.3":
+  version: 1.1.4
+  resolution: "partysocket@npm:1.1.4"
+  dependencies:
+    event-target-polyfill: "npm:^0.0.4"
+  checksum: 10c0/d859bcaef5f5e8be0f383140a896a41e78c95fc2166002d2a60f09168c720d78864e8f8e3251ed5146d46bf9487102dd9c81d34893c811bfc8ea64f7236f2fed
+  languageName: node
+  linkType: hard
+
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   resolution: "pascal-case@npm:3.1.2"
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-"react-is@npm:^16.12.0 || ^17.0.0 || ^18.0.0, react-is@npm:^18.0.0":
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-  resolution: "react-is@npm:18.2.0"
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+"react-is@npm:^16.12.0 || ^17.0.0 || ^18.0.0, react-is@npm:^18.0.0, react-is@npm:^18.3.1":
+  version: 18.3.1
+  resolution: "react-is@npm:18.3.1"
+  checksum: 10c0/f2f1e60010c683479e74c63f96b09fb41603527cd131a9959e2aee1e5a8b0caf270b365e5ca77d4a6b18aae659b60a86150bb3979073528877029b35aecd2072
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-  resolution: "react-is@npm:18.3.1"
-  checksum: 10c0/f2f1e60010c683479e74c63f96b09fb41603527cd131a9959e2aee1e5a8b0caf270b365e5ca77d4a6b18aae659b60a86150bb3979073528877029b35aecd2072
-  languageName: node
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-
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   resolution: "react-konva@npm:18.2.12"
@@ -12538,13 +12463,6 @@ __metadata:
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-"reconnecting-websocket@npm:^4.4.0":
-  version: 4.4.0
-  resolution: "reconnecting-websocket@npm:4.4.0"
-  checksum: 10c0/0155223200882e123bc884eb5935bdff7ee4d2998eee578c23bba6a6fec63b68c22ccaf9ff4bdcd05284568d89f02e6a664cc40daf108872f820197848b09579
-  languageName: node
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-
 "redent@npm:^3.0.0":
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   resolution: "redent@npm:3.0.0"
@@ -13358,16 +13276,16 @@ __metadata:
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-"sharedb@npm:^1.4.1":
-  version: 1.9.2
-  resolution: "sharedb@npm:1.9.2"
+"sharedb@npm:^5.1.1":
+  version: 5.2.2
+  resolution: "sharedb@npm:5.2.2"
   dependencies:
-    arraydiff: "npm:^0.1.1"
-    async: "npm:^2.6.3"
-    fast-deep-equal: "npm:^2.0.1"
+    arraydiff: "npm:^0.1.3"
+    async: "npm:^3.2.4"
+    fast-deep-equal: "npm:^3.1.3"
     hat: "npm:0.0.3"
-    ot-json0: "npm:^1.0.1"
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+    ot-json0: "npm:^1.1.0"
+  checksum: 10c0/9e8f6726a4f31fa1df3dd4b7019de088247e1584692f61c7ca20fc198c1b8d2540eff57810bfef6ba7c879ce99a9cbc483318262cf591b5e2c651481f9991fdc
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