Tap to test your reaction time
Tap to start, then wait for the panel to turn from red to green at a random moment — tap the instant it changes. Tap too early and you'll need to start the round over.
Average human reaction time to a visual cue is around 200–250 milliseconds; anything under 200ms is genuinely fast. It's a good one-tap way to check whether you're alert or running on empty, and unlike most of the other games here, it rewards being quick rather than being calm — a nice change of pace. Your personal best is saved.