Grid Recall · Number Span
Numbers appear scattered on the grid. Click 1 first — the moment you do, every tile hides its number. Then click the remaining tiles in ascending order from memory. Clear a round and one more number is added.
How to play Grid Recall
Numbers appear scattered on the grid. Click 1 first — the moment you do, every tile hides its number. Then click the remaining tiles in ascending order from memory. Clear a round and one more number is added.
What it measures
Grid Recall measures working-memory capacity for spatial-numeric positions — famously, young chimpanzees outperform most humans at this task. It's a pure, humbling test of how much you can hold at a glance.
Honest note: Inspired by the Kyoto University chimpanzee memory studies. It's a fun benchmark of raw span — not a measure of overall intelligence.
What's a good score?
Most people manage 8–10 numbers; reaching the teens is rare. The percentile we show is an estimate based on typical distributions, not a clinical norm.
FAQ
Why do the numbers disappear?
After you click 1, the rest go blank so you must recall their positions from memory.
What's my score?
The highest count of numbers you cleared in order.
Keep training
Grid Recall measures working-memory capacity for spatial-numeric positions — click 1, the numbers hide, then recall the rest in order. Famously, young chimpanzees outperform most adults on this (the Kyoto studies), which makes it a humbling, pure test of how much you can hold at a glance.
Who benefits most — no medical claims, just where the research points
Spatial working memory supports planning, mental mapping and keeping track of moving parts.
A genuinely surprising benchmark — most people are humbled, and hooked.
An engaging way to keep spatial memory active.