Play · Reaction test

Lights Out

Five red lights, one per second. Then a random hold, and darkness. Go the instant they go out — not a millisecond before.

READY
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Avg (last 5)—

Last 5 attempts

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Stored only in this browser. Times include your screen and input-device lag, so a fast monitor helps.

The verdict scale

  • Under 0.150 sSuspiciously fast
  • Under 0.200 sPole sitter
  • Under 0.250 sIn the points
  • Under 0.300 sBackmarker
  • 0.300 s +Still on the grid