reactiontime
Five red lights come on one by one. When they all go out, press Space, click or tap as fast as you can. The lights turn green when you react. A round is five starts, and your score is your average reaction time, lower is better. Press too early, or not at all, and the lights turn amber: that start counts 1 second and the next one begins. Press Escape to pause.
How to play
Five red lights come on one by one. When they all go out, press Space, click or tap as fast as you can. The lights turn green when you react. A round is five starts, and your score is your average reaction time, lower is better. Press too early, or not at all, and the lights turn amber: that start counts 1 second and the next one begins. Press Escape to pause.
About reactiontime
Play reactiontime free in your browser. Wait for the five lights to go out, then react as fast as you can. No download, no sign-up.
Top 10
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