Open data.win with your hex editor, and find 0x725D8C (00725D8C) or 0x725B24 (00725B24) if you're running an older version of the game, and change it to 01. I personally would prefer HxD, but anything will work as long as it can hex-edit. Well, if you have already extracted UNDERTALE.exe and got data.win, you'll need a hex editor. So, you've made it this far and you want to enable debug mode.

What REALLY enables debug mode is actually in data.win. Once you're done extracting, rename the new executable (whatever).exe to UNDERTALE.exe, and replace it in your UNDERTALE directory. Once you've extracted UNDERTALE.exe, it should ask you if you want to replace a new executable with the old one. WARNING: If you go past this point without backing up your game, you may break your game. Although it's possible, I don't recommend it, as extracting it will extract a new UNDERTALE.exe, so you should try pressing 'Extract Files' and select where it should be extracted. Then, click 'Extract Here' to extract it to the folder it's currently in. Go to the folder, and right-click on the executable. [That's what I used to extract the executable. Next, you should already have a zip extractor, like WinRAR. It will then open up an explorer window leading you to the executable. Go to 'Local Content', and then click 'Browse Local Content'. This is usually found at this location:Ĭ:/Program Files(x86)/Steam/steamapps/common/ Undertale.Īnother alternative if you don't know where you've installed Steam, go to your Library, right-click on UNDERTALE and press Properties. Well, first thing's first, you're going to have to go to your local content for UNDERTALE.

So, you've read this far, and you want to get to UNDERTALE's debug mode.

If there's a bunch, it's already extracted. You can find this by checking for a bunch of. Note: You can skip this part if UNDERTALE is already extracted.

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