The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
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Updated
Jul 20, 2025 - C#
The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
Uma tradução PT-BR do jogo DELTARUNE, originalmente feita pelo grupo TEIARRUMA. Traduzindo Ch3&4.
A work-in-progress modding tool geared toward UNDERTALE/DELTARUNE
A tool to convert DELTARUNE Chapter 1&2 save files between PC and console editions of the game.
Український переклад гри Deltarune.
Static site for viewing Undertale/Deltarune game scripts made so we have a site to reference when citing code on Undertale/Deltarune Wiki (original by xkeeper).
web ports of pc games
Underune maker is a map maker for Undertale and Deltarune. It contains all the assets, and you can make and customize as many rooms as you want.
An archive of the "main" Google documents for the Spamton Sweepstakes dataminers
Scripts to patch Deltarune PC to work on the Nintendo Switch
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