Recomp / RE tooling / Multi

UndertaleModTool

Tool for decompiling, unpacking and modding Undertale and other GameMaker games.

Tool Human-led released
Stars2.1k
Commits, 30 days0
Latest release0.9.2.0Aug 23, 2026
Last pushSep 7, 2026

GitHub figures as of 2026-10-14, refreshed daily.

Facts

Original
GameMaker games (Undertale)
Platform
Multi
Method
Tool
Provenance
Human-led · Repo created 2018, predates AI coding tools (GitHub) what this means
Status
released
Licence
GPL-3.0
Team
UnderminersTeam
Started
2018-09
Runs on
Windows
Needs the original
Yes: you supply your own legally obtained copy

How to get it legally

This project ships code only. Build or download it from the official repository, then supply data from a copy of GameMaker games (Undertale) you own. Recomp never links to ROMs, discs or game data.

This project was rebuilt by UnderminersTeam. Facts last checked 2026-10-14.

Sources

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