How to play
- 1
Tap to start, then wait while the screen stays red.
- 2
Tap as soon as it turns green — not before.
- 3
Your score is the average of three valid trials.
What this test measures
This test measures simple visual reaction time: how quickly you respond after a clear go-signal. The wait is random so you cannot just guess; tapping early restarts that trial.
Score guide
| Grade | Range |
|---|---|
| Alien | ≤150ms |
| Lightning | 151–200ms |
| Fast | 201–250ms |
| Average | 251–300ms |
| Slow | 301–400ms |
| Sleepy | >400ms |
FAQ
- What is a good reaction time?
- Many players land around 200–300ms on this test. Under 200ms is quick; scores at or below 150ms are uncommon.
- Why are there three trials?
- Averaging three taps reduces one lucky or slow click. The mean of the three valid trials is your score.
- Why was I marked too early?
- The screen was still red. Wait for green, then tap. That trial restarts and does not count.
- Is this a medical reflex exam?
- No. It is a free online game and not a clinical assessment.