The ACT Button Glitch That Broke Undertale's Speedrun World - Critter Realm

July 30, 2026 · Critter Realm

The ACT Button Glitch That Broke Undertale's Speedrun World

This glitch feels relevant again because runners are replaying key sequences. Viewers love seeing records threatened by code quirks.

The ACT Button Glitch That Broke Undertale's Speedrun World is a menu input bug. It tricks the game into skipping enemy encounters instantly. Studies indicate this bug creates a false sequence, breaking intended checks.

This bug relies on rapid menu spam at precise frames. Research shows certain controller inputs bypass turn logic entirely. Runers call this pattern ACT spam for short.

Runners now respect menu timing more. Practice discipline keeps records honest.


What happens if the glitch triggers during a boss fight?

Runs diverge, causing major time loss or forced resets.

Why is this still discussed in the community?

It reshaped route theory and how runners handle menus.

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