Waiting for the green flash
Press the panel and it turns red, telling you to hold. Then, after a pause of random length so you can never time it, it flips to green. The instant you see the color change, you tap, and the game clocks the gap between green appearing and your finger landing, measured in milliseconds, a thousand of which make a single second. Jump early, while it is still red, and the round resets, since there is no rewarding a guess. Five rounds give you an average, and your quickest single tap is kept as your best.
Reacting, not guessing
The trap everyone falls into is trying to predict the green rather than react to it, which almost always means tapping too soon and restarting the round. Keep your eyes on the panel and your finger hovering, but let the color, not a hunch, pull the trigger. Oddly, staying loose helps: a relaxed hand fires faster than a tense one braced to pounce. Play a handful of rounds and watch the average creep down.
What milliseconds can teach
This little test is a friendly way into the idea that time can be measured in slivers far smaller than a second, and that practice actually moves the number. A typical human reaction lands around a quarter of a second, and seeing your own figure, then watching it shrink over a few tries, makes an abstract unit feel real. It is quick and a touch addictive, which is exactly what makes it a good ten-second break between longer activities.
Frequently asked questions
How does the Reaction Time test work?
Wait for the screen to turn green, then tap as fast as you can. The game measures how many milliseconds it took you to react. You play 5 rounds and get your average time and your best time.
What is a good reaction time?
A typical reaction time is around 250 milliseconds, and it gets faster with practice. Children are often a little slower at first and speed up quickly. The goal is to improve your own best.
Does tapping early count in the Reaction Time test?
No, and that is the point. If you tap before the screen turns green the game flags it as too early and makes you wait again, so you cannot cheat by guessing. The only way to a fast score is to genuinely react to the color change, which is exactly the skill the test measures.