Remember a number that grows by one digit every round and find out how many digits you can hold in your head
How to use
Press Start. A number appears for a few seconds.
When it disappears, type the number and press Submit.
Get it right and the next number has one more digit.
One wrong digit ends the game. Your score is the longest number you remembered.
Why use this tool
A classic digit span test: The same idea psychologists use to measure short term memory: how many digits you can hold in mind at once.
Fair timing: Longer numbers stay on screen longer, and every digit is equally random, with no leading zero to trip you up.
See exactly where it went wrong: When you miss, your answer is shown under the real number with the wrong and missing digits marked.
Track your progress: Your scores are saved on your device with your best and recent average, so practice shows.
Challenge friends: Send your score as a link and see who can remember more digits.
Frequently asked questions
How many digits can the average person remember?
About 7, give or take 2, is the classic figure for short term memory. Many people reach 8 or 9 with practice, and memory athletes go far beyond that using special techniques.
How can I remember more digits?
Group them. Instead of 9 separate digits, remember three numbers of three digits, the way phone numbers are split. Saying them to yourself in a rhythm also helps.
Does this test measure intelligence?
No. It measures one part of working memory. It changes with tiredness, focus and practice, so treat it as a fun brain exercise, not a diagnosis.
Why can I not copy the number?
Copying is blocked while the number is on screen so scores stay fair when you challenge friends.