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Reaction time test

What's measured

The screen changes colour after a random wait. Your reaction time is how long it takes you to tap after the change, in milliseconds (ms). Tap too early and the round restarts.

What's a good time?

Many people score around 200–300 ms. Your device and screen add a little delay, so the best comparison is your own personal best.

Tips

  • Rest your finger just above the button, look at the centre of the box, and don't guess the timing — the wait is random on purpose.
  • Take a few tries; the first is usually slower.