Chimp Test Online
Practice number-order spatial memory on a deterministic 6×6 board with Classic, Flash, Fixed Span and Endurance modes.
What a Chimp Test round asks you to remember
A Chimp Test board shows a small set of numbered positions on a 6×6 grid. Your job is not to calculate anything and not to remember a spoken sequence. Instead, you encode where each visible number sits. You select 1 first. In Classic, Fixed Span and Endurance, that first correct selection hides every number that remains. The empty-looking squares keep their positions, so the rest of the task is to reconstruct the ascending order from your spatial snapshot. This makes the loop different from ordinary sequence memory, where the program shows one item at a time, and different from number memory, where you recall a long string of digits.
Classic Ladder and the three-strike rule
Classic begins with four numbered cells. Clear a board and the next board adds one more number, up to the local cap. A wrong position is a strike, and three strikes end the run. This structure rewards a peak span but still records how many boards were actually completed. The app stores your browser-local best span and session history rather than turning one result into an invented global rank. If you want to compare attempts, keep your device, zoom and input method similar because a small phone, a large monitor, touch and a mouse can change how quickly positions are encoded and selected.
Flash, Fixed Span and Endurance
Flash keeps the span at eight but removes the labels after a short 900 ms exposure even if you have not started clicking. Fixed Span lets you choose 4 through 18 and repeat ten boards at the same load. That is useful when a ladder becomes noisy and you want repeatable practice just below or around your current limit. Endurance uses twenty boards and gradually steps the span upward, emphasizing consistency over one lucky peak. All four Practice modes are generated locally from a seed in the URL, so the same mode, span and seed reproduce the same cell placements.
Deterministic boards and honest local records
Every board chooses unique cells from the 36 positions and assigns exactly one number from 1 through the requested span. The independent verifier checks that no two numbers share a cell, all positions remain inside the 6×6 board, the numbered order is complete, and the same key reproduces the same board. There is no remote puzzle corpus and no paid API. Completed sessions update only browser-local statistics. The app reports boards, perfect boards, strikes, best span and a local score. It does not fabricate a worldwide percentile, IQ estimate, clinical memory score or comparison with another population.
Why the numbers disappear
The defining constraint is that the visible labels are available only for the initial encoding phase. In most modes the first correct selection, number 1, triggers the hide state. The squares do not move; only their labels disappear. You then have to use the spatial pattern you encoded before the hide. Flash changes only the timing by hiding automatically. Empty cells remain clickable positions, and choosing a wrong square counts as an error rather than silently steering you toward the next answer. This keeps the task about memory rather than trial-and-error search.
How to use the result
A higher best span means you correctly handled a board with more numbered locations during that run. A perfect-board count tells you how many boards were cleared without an error. Strikes show errors explicitly. These measures are useful for self-comparison, but they are task-specific. Sleep, distraction, screen size, familiarity with the board, input latency and strategy can all shift the result. Treat a session as practice feedback, not as a diagnosis or a stable statement about intelligence.
Strategy without turning the task into a trick
Many players benefit from scanning the board in numerical order before clicking 1, rather than staring at one number at a time. You can also notice rough zones—upper left, center, lower right—while preserving exact positions. At larger spans, grouping nearby consecutive numbers can reduce the number of separate spatial anchors you need to hold. The goal is not to find a secret exploit. A useful strategy should still require you to remember where the numbers were after the labels hide.
Fresh Practice and replayability
Fresh Practice changes the URL seed and creates a new deterministic board series. Keeping an old URL gives you an exact replayable course, which is useful when comparing methods or checking whether a surprising result came from an unusually easy layout. Fixed Span is especially good for this: choose a span, play a seed, then use Fresh Practice for another course at the same load. Your Practice records remain separate from the frozen Today’s 6 lineup.
Accessibility and input notes
The board uses native buttons for all 36 cells so touch, mouse and keyboard focus behavior remain predictable. Visible numbered cells have text labels during the encoding phase, and the game status announces session changes. Because the task is inherently visual-spatial, it is not equivalent for every assistive technology or visual condition. The page therefore avoids claiming that scores are universally comparable. Use the mode only when the board presentation is comfortable for you.
What this page does not claim
The popular name comes from a well-known number-order spatial memory format. This implementation does not claim that a score proves you are smarter or less smart than a chimpanzee, and it does not translate a span into IQ. It is not a medical memory test, ADHD test, dementia screen or neurological assessment. The useful promise is narrower: a deterministic browser task, transparent rules, honest local history and repeatable practice.
Classic versus ordinary Memory Grid practice
The existing Memory Grid area includes visual tile memory, sequential flashing, number-span recall and matching pairs. Chimp Test is intentionally separate because its interaction contract is different: all numbered locations are visible together, then the labels disappear and the player must reconstruct an ordered spatial map. Keeping it as a specialist prevents the generic Memory Grid page from becoming an overloaded menu and gives this loop its own deterministic seeds, statistics and Daily challenge.
A focused acquisition page, not a doorway farm
There is one general Chimp Test landing and one Daily Chimp landing. We do not generate separate search pages for every span, every mode, every score, every device or every seed. The actual game page already lets you choose Classic, Flash, Fixed Span and Endurance. Concentrating the explanation here keeps search-facing content tied to a distinct intent instead of producing thin variants that all lead to the same tool.