The Number Memory Test measures how long a number you can hold in short-term memory. A number flashes on screen, then you type it back from memory — and every time you get it right, the next number is one digit longer.
How the test works
Each round shows a randomly generated number for a brief moment, with longer numbers displayed slightly longer so the challenge is recall rather than reading speed. When the number disappears, an input box appears; type exactly what you saw. A correct answer advances you a level and adds a digit, while a single mistake ends the run and reveals the level you reached.
What your score means
The level you reach is effectively your digit span — the longest number you could recall in one go. Most people manage around seven digits, the classic short-term memory limit identified in memory research. Reaching ten or more usually means you are chunking the digits into groups, a common and effective memory strategy.
Improving your score
Try grouping the digits into pairs or triples as you read them, the way you naturally remember a phone number. Saying the number to yourself, staying relaxed, and avoiding distractions all help your working memory hold on a little longer.