A circle sits on screen. The moment it turns green, tap it. Your reaction time in milliseconds is recorded. 10 rounds — your average determines your score. Leaderboard ranked by average ms.
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Under 250ms is excellent. Under 200ms is elite.
Mental math at full speed. 90 seconds. No calculator.
The word says RED but it's written in blue. Tap the ink colour, not the word.
Numbers 1-20 scattered on screen. Tap them in order. As fast as possible.
Targets appear and shrink to nothing. Tap them before they disappear.