How to Erase All Undertale Data
If you're looking to wipe your Undertale slate clean, just delete the save files and config file located in the game's directory. This should reset everything!
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Cool hot tip: Search for the save file in AppData and delete the entire folder named 'UNDERTALE'. You'll start fresh after that!
Go to your Users folder > [Your Username] > AppData > Local > UNDERTALE and delete the files there. Easy peasy, lemon squeezy!
One word: Reinstall. Uninstalling and reinstalling the game also clears all your data.
Just nuking the save files in the AppData folder might not be enough since Undertale leaves traces in the registry. Use a registry cleaner for a true blank slate!
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