How to Enable Undertale Debug Mode
To enable debug mode in Undertale, you’ll need to edit the game’s code. Go to the file called "data.win" (or a similar name depending on your version) and open it with a hex editor. Search for the string [DEBUG] and change the value to 01. It's a bit tricky, so make sure to back up your files first!
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Hex editor, data.win, change debug to 01. Simple!
Just use a hex editor on the "data.win" file and change the debug flag to 01 - done this myself and it works!
Open the "data.win" file with a hex editor and change [DEBUG] to 01. Easy-peasy.
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