How To Turn On Hellfish Mode?

Posted in Donut Mod
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How do you activate the hellfish mode in the donut mod?
RMB the Donut Mod in the mod launcher, and click "Settings" in a pop-up menu
Gordon's right, but here's an image just for more context:

You can also click "Mod Settings" in the side. The difficulty setting can be changed without affecting save files, so if you find it too difficult, you can switch it on/off for missions. It will require you to close and reopen the game however.