Goal

One cell in the 5×5 grid lights up green at a time. Tap it before it fades. Keep going for 60 seconds.

Rules

• Only the green cell counts — tapping any other cell while it's lit costs points.
• Miss the window entirely and your streak resets.
• The window shrinks as your score climbs — Normal → Fast → Rapid → MAX.

Scoring

Every hit earns 2 points, plus a speed bonus (the faster you tap, the more), plus 2 for every 5 hits in a row (up to +4). Your reaction time shows on each hit. A missed cell or a wrong tap costs 5.

Reaction Speed

Reacting to a randomly placed target under a shrinking time window trains visual search and simple reaction time — the same fast perception-to-action pathway used in driving and sports.