Test your number memory
The Human Benchmark classic: digits appear, vanish, and you type them back — one digit longer each round.
Tools used in this guide
The job
Working memory holds about 7 ± 2 items for most adults — this test puts a number on yours. Level 1 shows 3 digits; each success adds one.
Watch and retype
Digits display for ~1.1 s plus 0.75 s per extra digit, then hide. Type them exactly — a single wrong digit ends the run and reports your length.
Worked example
Reaching 9 digits means your buffer held '4 8 2 9 1 5 7 3 0' long enough to retype — around the 80th percentile on public benchmarks.
Where it stops
Chunking helps: '104729' as '10-47-29' is a legitimate strategy, so the score measures effective memory, not digit-span purity. Results aren't stored or compared against others.