UnderminersTeam/UndertaleModTool
The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!) observed · 2026-08-28
Health v2 · maintenance only
95/100
- Activity 99
- Release rhythm 87
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 30.5
- age_days: 2911
- days_rel: 10
- days_push: 10
- n_releases_24m: 13
Adoption not part of the score
2012 stars · 355 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
A GUI and CLI tool for modding, decompiling, and unpacking Undertale, Deltarune, and other GameMaker Studio games. It provides editors for GameMaker assets and code, GML decompilation/compilation, and scriptable extensibility via C#.
Use cases
- mod undertale
- decompile gamemaker game code
- unpack data.win file
- edit deltarune sprites and rooms
- decompile gml bytecode
- extract assets from game maker studio game
- script batch edits on gamemaker data files
When to choose
- modding or inspecting Undertale, Deltarune, or any GameMaker Studio 1/2 game
- you need accurate byte-level round-tripping of data.win files
- you want GML decompilation plus asset editors in one tool
- you need automation via CLI or C# scripts
When to avoid
- you need a native Linux/macOS GUI - only CLI or Wine work there
- the game is not built with GameMaker
- you want a general-purpose game engine editor rather than a data file modding tool
Facets
application · maturity active
editor parser reverse-engineering cli gui developer-tools reverse-engineering gaming-tools windows cli cross-platform gamemaker undertale deltarune gml decompiler unpacker modding data-win game-development
2 sources
- readme: https://github.com/UnderminersTeam/UndertaleModTool · fetched 2026-08-28 · 669cab43e073
- homepage: https://underminersteam.github.io/ · fetched 2026-08-29 · 5cea6489c702
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| UnderminersTeam/UndertaleModTool | main | 95 |
For agents
markdown · JSON · MCP: product_card(name="UnderminersTeam/UndertaleModTool")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem