Quick Scoop

“Undo” for Flash in Slap Battles is the mastery move that lets you press R shortly after teleporting to return to your previous spot and refresh the teleport for a second use. It also removes the black veil and makes the teleport instant once mastered.

How it works

• Use Flash’s teleport.
• Press R within about 1 second.
• You snap back to where you started, and your teleport is ready again.

Common use

Players use it to chain movement, escape danger, or set up a fast double- teleport combo. One example is teleporting in, slapping, undoing, then teleporting again for another hit.

If you meant the mastery task

If you were asking how to unlock Flash mastery, the documented tasks include teleporting 100 times in a row without getting slapped, ambushing enemies 750 times, and teleporting 1,500 times total.

Short version

• Undo key: R.

• Timing: very soon after teleporting.

• Effect: returns you to the start point and gives a second teleport.