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Study the numbers, tap 1, then finish the sequence after every remaining label disappears. Clear a round and the next one gets harder.
Press Start when you are ready.
No completed Practice sessions on this device yet.
We save literal local results: boards cleared, strikes, best span and elapsed time. We do not fabricate a population percentile, IQ estimate or medical interpretation.
Display size, input device, familiarity and interruptions can affect performance, so compare your own runs under similar conditions.
Start at four numbers. Tap 1 and the remaining labels vanish. Each successful board adds one number. Standard mode gives three strikes.
Eight positions hide automatically after 900 ms. Complete ten deterministic boards.
Repeat ten boards at one chosen load from 4 through 18. The URL keeps the seed for exact replay.
Twenty boards begin at span six and step upward every four boards, rewarding consistency rather than one peak attempt.
Each date maps to eight deterministic boards spanning 5 through 12. Daily history is local and separate from Today’s 6.
Enter starts or replays, P pauses, F toggles Focus and M toggles sound.
Run fixed, reproducible Chimp Test trials and inspect exactly where recall breaks down by span, preview speed and board layout. Evidence stays in this browser.