The Secret Mercy Glitch That Beats Undyne the Undying instantly - Felix Cat Insurance

July 28, 2026 · Felix Cat Insurance

The Mercy Glitch That Skips Every Boss Fight

Sites push this trick because speedrunners share fresh clips. Players rediscover old quirks that break expected limits.

The Secret Mercy Glitch That Beats Undyne the Undying instantly targets enemy mercy phases. This shortcut uses coded timing to skip animations. Reviews describe it as sequence breaking via mercy abuse.

During boss mercy, specific input cancels attack frames. Frames shift because menu choices load early variables. Research shows menu delays change encounter state early. Studies indicate input buffers exploit these waits to skip transitions.

Skip the grind by forcing enemy surrender before damage.

Can this break your save or ban you online?

  • Single player offline use keeps saves safe. Multiplayer modes usually block this exploit automatically.

  • Some communities restrict sequence breaks in timed runs. Check rules before using shortcuts in public events.

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