React on go and stop on no-go
Wait for a cue, make the right decision, then review the whole run.
Respond only to GO. A STOP cue passes when you leave it alone.
Use Space, or the GO button. Tab hides and focus loss discard the run.
Your run
Scoring method: 2026-09-19.2. How this score works
Responding and withholding
A GO response records its time. Missing GO is an omission. Responding to STOP is a false response. Waiting through STOP is correct withholding.
The run contains 12 cues with equal counts of each type in shuffled order. Each cue stays for up to 2 seconds. An early press retries that cue and does not consume a round.
Compare your own decisions
The headline counts correct decisions. The median uses correct response times only, so mistakes remain visible beside speed. Compare the same challenge on the same device. This is a game, with no cognitive or medical interpretation.
For a cue without a choice, use the simple reaction test. See the timing and scoring rules.
Try the related task
- Reaction time test: Respond to randomized cues, catch false starts, see every attempt plus median and best, then share or retry.
- Choice reaction test: Match the arrow with the correct direction, then see response times, wrong choices and your own best. Try another round instantly.
- Memory hub: Try sequence, visual, number, word and number-order memory tests, then compare your own bests and choose the next challenge.