Number Memory
A number flashes for a moment. Type it back. One more digit every round.
What is number memory?
Number memory tests your digit span — how many digits you can hold in short-term memory and repeat back correctly. It is one of the oldest and most reliable measures of working memory, used in cognitive testing for over a century. Here a number flashes on screen, disappears, and you type it back. Each time you get it right, the next number is one digit longer, so the game keeps pushing until it finds your limit.
How many digits can most people hold?
The famous "magic number" is 7 plus or minus 2 — psychologist George Miller's finding that most people hold about seven items in short-term memory. In practice, average digit span is around 7, most people land between 5 and 9, and reaching 10 or more almost always means you are chunking: grouping the digits into pairs or triples, the same trick that makes phone numbers easy to remember.
- 4-5 digits - below average; easy to improve with chunking.
- 6-7 digits - the normal human range.
- 8-9 digits - sharp working memory.
- 10+ digits - excellent, and almost certainly using a memory technique.
Tips to remember more digits
- Chunk the number into pairs or triples instead of single digits — "4 9 2 7 1 8" becomes "492" and "718".
- Say the digits to yourself on a rhythm as they appear; the sound reinforces the memory.
- Turn groups into something meaningful — a year, an age, a familiar date — so they stick.
- Do not panic when the number gets long. Stress is what breaks working memory first.
How this test works
A number appears for a moment, then hides. Type what you saw and submit. Get it right and the next round adds a digit; get it wrong and the game ends at your highest perfect length, which becomes your score. Your best and daily streak are stored in your browser only, with no sign-up and nothing sent to a server.
Test the rest of your brain and reflexes: memory flash, the reaction time test, or thetyping speed test.
FAQ
What is the average number memory span?
Average digit span is about 7 digits, with most people landing between 5 and 9. This matches the classic '7 plus or minus 2' finding about the limits of short-term memory.
How can I remember more digits?
Chunk them into groups of two or three, say them on a rhythm, and turn groups into meaningful numbers like years or ages. Chunking is how people reach 10+ digits — you are remembering three or four chunks, not ten separate digits.
What score do I get?
Your score is the longest number you type back perfectly. When you miss, the game ends at your best length so far.
Is this the same as an IQ test?
No. Digit span is one component of working memory and correlates loosely with some cognitive measures, but a single browser test is a fun benchmark, not an IQ score or a diagnosis.
Is my score saved or shared online?
No. Your best and streak live only in your browser via localStorage. There is no account, and sharing only happens if you tap the share button yourself.