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The most complete tool for modding, decompiling and unpacking Undertale (and other Game Maker: Studio games!)

Results 554 UndertaleModTool issues
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### Describe the bug Using ImportGraphics many, many times has caused a large build-up of embedded textures, which (as far as I know) only has one solution: using ReduceEmbeddedTexturePages. (NewTextureRepacker...

bug

### Describe the bug The GitHub build actions copy the "GameSpecificData" folder to the output directory, but the "UndertaleModLib" project already copies that on build (`dotnet build`), and it results...

bug
lib
github page

## Description Legacy tiles didn't have a scale transform at all, so I added one. This should fix tile rotation problems in Undertale Yellow. ### Caveats None ### Notes None

### Describe the bug For some odd reason, whenever I attempt to import edited sprites into Chapters 3 and 4 of Deltarune, they end up stretched, tiny, miscolored, or in...

bug

### Describe the bug when i make a room it does this loading error and makes me unable to open the game ### Reproducing steps 1.make a room can be...

bug

### Describe the bug Trying to import sounds, they play in UMT but not in DELTARUNE. ### Reproducing steps 1. Find a sound to replace, and replace it (ive been...

bug

## Description This PR enables you to move game objects in the "Game objects (from all layers)" in GMS2 games. This should change the instance creation order. ### Caveats None...

## Description This is a script that tries to export all the sprites within the game as sprite sheets, with a two-pixel gap between each frame. Here is an example:...

### Describe the bug When it asks if you want to open the dropped file, the popup doesn't show on top. ### Reproducing steps 1. Drag and drop a "data.win"...

bug
gui

## Description This is a script meant to automatically remove the date and time check for the So Sorry Encounter in Undertale. The best way I found to do that...