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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 While i was opening the data.win, it suddenly shows this message [Screenshot 2025-11-04 165556.png](https://drive.google.com/file/d/15wayfnb24XcCiCtGS_6fl35Cm0q79Yns/view?usp=sharing) , yesterday I just changed 2 sprites and I also saved the...

bug

--------------------------- Save error --------------------------- An error occurred while trying to save: Bad tile list length, should be tile count * frame count at 0174C058 while writing object UndertaleModLib.Models.UndertaleBackground in chunk...

bug

### Which component should be improved? Compiler ### Describe your feature suggestion in more detail this is minor but why is it specifically called ubuntu when it's just the default...

enhancement

### Which component should be improved? UI/UX ### Describe your feature suggestion in more detail The Selection grid for tile-sets is automatically set to 16x16 when it should be 20x20...

enhancement

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 5. Release notes Sourced from actions/upload-artifact's releases. v5.0.0 What's Changed BREAKING CHANGE: this update supports Node v24.x. This is not a breaking change per-se but...

dependencies

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6. Release notes Sourced from actions/download-artifact's releases. v6.0.0 What's Changed BREAKING CHANGE: this update supports Node v24.x. This is not a breaking change per-se but...

dependencies

Added CSV Import/Export scripts

### Which component should be improved? Compiler ### Describe your feature suggestion in more detail I want a simple tutorial on how to install on linux or just publish it...

enhancement

### Which component should be improved? Other ### Describe your feature suggestion in more detail Heya. I wasn't entirely sure whether to do a bug report, feature request, or both...

enhancement

Audiogroup support fixes Moving sounds between audiogroups Bug fixes ## Description 1. The script now allows you to move sounds between audio groups if you accidentally added music to the...