Number Memory Test
Remember a number that grows by one digit every round.
Remember the number
A number appears for a moment. Type it back once it disappears. Each correct answer adds one digit. One mistake ends the test.
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Each number stays on screen for 1 second plus 0.5 seconds per digit.
How to use
Press Start. A 3-digit number appears with a bar that empties while it is on screen.
When the number disappears, type it into the field and press Enter or Submit. On phones the numeric keypad opens when you tap the field.
A correct answer brings the next number, one digit longer. Each number stays up for 1 second plus 0.5 seconds per digit.
One wrong answer ends the run. The result shows the longest number you remembered and compares the last number with what you typed, digit by digit.
FAQ
How many digits can most people remember?
A span of about 7 items, plus or minus 2, is the figure most often linked to George Miller's 1956 paper on short-term memory. Later research suggests the core capacity is smaller, around 4 chunks, and that longer spans come from grouping digits. Your result depends a lot on the strategy you use.
Can I use memory tricks?
Yes. Grouping digits into chunks, saying them in a rhythm, or linking them to dates and numbers you know are common strategies. Using the same strategy each time makes your results easier to compare.
How long is each number shown?
1 second plus 0.5 seconds for every digit, so a 3-digit number is shown for 2.5 seconds and a 10-digit number for 6 seconds.
Why does one mistake end the test?
The test measures the longest number you can recall exactly. Ending at the first miss keeps the score simple: it is the length of the last number you got right.
Are the numbers random?
Yes. Every digit is random, except that the first digit is never 0, so the number always has the length shown. Nothing is uploaded, and your personal best is saved only in this browser.