How to fix Undertale not launching
Try running the game as an administrator. Right-click on the Undertale icon, select 'Run as administrator,' and see if it launches.
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I once had this problem, and verifying the integrity of the game files on Steam fixed it. Open Steam, go to your library, right-click on Undertale, choose Properties, then Local Files, and click Verify Integrity of Game Files.
First, make sure your graphics drivers are up to date! A quick update can work wonders.
Disable your antivirus temporarily. Sometimes, antivirus programs get a bit overprotective and block games from launching.
Hot take: Reinstalling the game is a surefire way to fix most problems. Last resort but it works!
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