⚡ Reaction Lab

How to play Reaction Lab

Wait for green, then strike. How fast are your reactions? Use space / tap to play on supported devices. Your local personal best is automatically remembered in this browser. An account is optional but required to join the online rankings.

Keep improving

Try a fresh run and compare your latest score to your best. If you have an ArcadeHarbor account and the online database is configured, your top score can also appear on the public leaderboard.