Last updated 26 August 2026
Why the wait is random
The delay before the box turns green is randomized every time, so there's no way to predict the moment and click on a guess — a click before the color changes is flagged immediately as a false start rather than scored, since it isn't a genuine reaction to anything. Typical human reaction time to a simple visual cue sits around 200-250 milliseconds; it has a real physiological floor, so scores don't keep dropping indefinitely with practice.
Common questions
Why does the wait time change every attempt?
A random delay stops you from anticipating exactly when the color will change and clicking on a guess rather than a real reaction — without it, the test would measure timing prediction instead of reflexes.
What counts as clicking too soon?
Any click before the box turns green. It's flagged immediately as a false start rather than scored, since a click before the cue appears isn't a reaction to anything — tap again to restart.
What's an average human reaction time?
Around 200-250 milliseconds for a simple visual cue is typical. Trained athletes and gamers can get somewhat faster, but reaction time to a simple visual stimulus has a real physiological floor — it can't keep improving indefinitely.