Test your reaction time. Tap green. Don't tap red.
About
Five rounds, one number. Wait for the screen to flash green, then tap as fast as you can. Tap too early and the round is void. Best, average, and streak tracking baked in. Daily-style shareable score card at the end. Surprisingly addictive — your reaction time is usually 220–280ms, but you'll spend twenty minutes trying to crack 200.