How to play

Four numbers appear at random positions on an eight-column grid. Study their positions for as long as you need. Selecting 1 hides the remaining numbers. Select their squares in ascending order from memory.

Complete the sequence to unlock a round with one more number, up to the grid's 40 squares. A wrong square ends your run and reveals the numbers. Your score is the largest sequence you completed in that run; missing the opening round scores zero.

Find a pattern you can remember

Try grouping nearby numbers, or tracing the route between them before selecting 1. Keep your screen, input device and study time similar when comparing runs. Your best score is stored in this browser, and Share Score lets someone else try to beat it.

What the result means

This is a number-position memory game. The familiar “chimp test” name refers to games inspired by number-masking research with chimpanzees. Our self-paced browser version is not the original laboratory experiment, and its score cannot establish a human percentile, an IQ score or a comparison with the chimpanzee Ayumu.