Copy your Undertale folder (i. e. the folder that contains UNDERTALE.exe; it can be found in "SteamLibrary/steamapps/common" if you've got the game from Steam) and ...
When in the overworld, press M to open the practice menu. The Main page contains options to enable/disable debug, savestate functionality, and (most) in-game music. The Stat page contains options to ...
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