Wait for the screen to turn GREEN, then click as fast as you can.
Clicking early on RED = foul.
Average human: ~250ms. Gamer: ~180ms. What about you?
Average human reaction time sits around 250ms. Trained gamers get closer to 180. This free test strips the whole thing down to one click: wait for green, then go. Jump the gun on red and it doesn't count, so it's not just about speed.