How to Change Undertale Game Files
Back up your original files first. Then, go to the game's directory, find the files you want to change, and edit them with a program like Notepad++.
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The easiest way is to mod the game using tools like UndertaleModTool! Just be careful not to break anything.
Don't! It's better to enjoy the game as it is. Changing the files might mess up your game.
Editing Undertale's game files can be done by navigating to the game's folder, usually found in your Steam directory or equivalent on consoles, and using text editors to modify the game data. I did this to change character sprites and it worked out great!
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