How to Fix Corrupted Undertale
First, try verifying the game files if you're on PC. Open Steam, right-click on Undertale, go to Properties, and then select the Local Files tab. Click on 'Verify Integrity of Game Files' to have Steam check and repair any corrupted files.
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If you're playing on console, try uninstalling and reinstalling the game. This usually fixes corrupted game issues. Just make sure to back up your save data if possible!
You can try deleting the 'UNDERTALE' folder in your AppData, but be cautious as you might lose your save files. Back them up first!
Honestly, just reinstall the game. Easiest solution, works 99% of the time. Save your progress first tho!
My game got corrupted once, and I just downloaded the latest patch again. Fixed everything right up for me.
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