20 numbers spread randomly across the screen. Tap 1, then 2, then 3 — all the way to 20, as fast as you can. Simple concept. Brutal execution. Your time is your score.
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No — they're fixed. Only your eyes need to move.
Mental math at full speed. 90 seconds. No calculator.
The circle turns green. Tap it as fast as you can. 10 rounds.
The word says RED but it's written in blue. Tap the ink colour, not the word.
Targets appear and shrink to nothing. Tap them before they disappear.