How to Reset Undertale on Steam?
Just delete the 'undertale.ini' file in the game's installation directory! Path should be something like C:\Program Files (x86)\Steam\steamapps\common\Undertale.
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I've done this: Go to C:\Users\[Your Username]\AppData\Local\UNDERTALE and delete all the files in there. Worked like a charm for me!
Navigate to the Undertale folder in your Steam directory, then just delete the 'file0', 'file9', and 'undertale.ini' files. Easy peasy!
Just uninstall and reinstall the game. Quick fix!
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