How to Fix Undertale Black Screen
Hey! Try verifying the integrity of the game files on Steam. Right-click on Undertale in your library, go to Properties > Local Files > Verify Integrity of Game Files. That might do the trick!
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Unplugging all USB devices except for your keyboard and mouse worked for me. Worth a shot if nothing else helps!
If you're on a PC, updating your graphics drivers can sometimes fix the issue. Just go to your GPU manufacturer's website and get the latest drivers.
Reinstalling might help. Just make sure to back up your save files first!
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