How the Reaction Test works
Click the panel to begin. It turns red and, after a random delay, flips to green — the instant it does, click again. The game measures how many milliseconds it took you to react. Click too early, while it's still red, and the round resets.
Tips
- A typical human reaction time is around 200–270 ms — anything under 200 is excellent.
- Watch for the colour change rather than trying to predict the timing. Your best time is saved.
More brain games: try Simon Says or Color Match, or see all games.