Reaction · click when green
Round 0 / 5
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How it works
- Click to start, then wait. The screen will turn from red to green after a random delay.
- Click as fast as you can the moment it goes green.
- Click during red = round fails, restart.
- Five rounds. We report the median (more stable than mean).
- Average human: 250 ms. Trained: 180 ms. Top fighters: 120 ms.