Click to start
Wait for green, then click as fast as you can
Average human reaction: ~250 ms. Gamers often hit 150–200 ms. Don't click too early!
How it works
Reaction time: click as soon as the box turns green — your millisecond score is the time between the color change and your click. Five rounds, best of five shown.
Click speed (CPS): click the box as many times as you can in 5 seconds — your CPS is clicks ÷ 5.