About the game
The reaction time test measures, in milliseconds, how quickly you can click the moment the screen switches from red to green. Your final result is the average of five rounds, so a single lucky click will not carry you — steady concentration will.
A typical adult's visual reaction time falls between 200 and 300 ms, and anything under 250 ms is respectable. The waiting period is randomized every round, so memorizing a rhythm and clicking early will not work: click before the green appears and that round simply restarts. Find out your average, then keep coming back to beat your own best.
How to play
- Tap (click) the test area or press Space to begin.
- Wait through the red screen, then click the instant it turns green.
- After 5 rounds you will see each measurement and the average.
Rules
- The waiting time is random, between 1.2 and 3.8 seconds each round.
- Clicking before the green appears shows 'Too soon!' and the round is retried.
- Your final result is the average of 5 valid measurements in ms.
- Lower is better; your lowest-ever average is stored as the best record.
Strategy & tips
React to the change, not the color
If you wait to verify 'that is green' before clicking, you are already late. Train yourself to fire on the instant the brightness shifts — detecting change, not identifying color, is the key to a fast record.
Keep your finger pre-loaded
Rest your finger lightly on the mouse button or screen, held just short of a press. The simple act of lifting a finger before pressing costs 20 to 30 ms.
Fix your gaze at the center of the area
Do not try to read the text. Staring blankly at the middle of the test area lets your peripheral vision catch the change fastest.
Manage your condition and setup
Reaction speed is affected by fatigue, caffeine and screen refresh rate. If you are serious about a record, attempt it well-rested, at your most alert time of day, after several warm-up runs.
FAQ
What is a normal average reaction time?
Roughly 200-300 ms for a visual stimulus in adults. Below 200 ms is very fast, and some professional gamers record averages in the 150s. Age, fatigue and hardware all shift the numbers, so treat them as a guide.
Does the measurement include device latency?
Yes. Display refresh rate and touch input delay can add anywhere from a few to tens of milliseconds. Comparing your own records on the same device is the most meaningful use of the numbers.
What happens if I click too early?
The round is voided and retried after a short pause. There is no penalty, but you need five valid rounds to produce an average.
Is PC or mobile better for records?
A PC with a gaming monitor and mouse usually has lower input latency. The gap is tens of milliseconds at most, though, so the best practice is simply to measure consistently on one device.
