Number Memory
A number flashes up. Type it back.
A number flashes up. Type it back.
Each level adds one more digit. Most people manage about seven — the classic limit of short-term memory. Grouping the digits in pairs helps more than staring harder.
Private by design. This tool runs entirely in your browser. Your input is processed on your own device and is not uploaded by DO101.
About the Number Memory
Each level adds one more digit to remember. Most people stop somewhere around seven, which is the classic figure for how much short-term memory holds at once — chunking the digits into pairs is the trick that pushes you past it.
How to use it
- 1Watch the number while the bar runs down.
- 2Type it back exactly.
- 3Each correct answer adds another digit.
What you get
- One extra digit per level
- Display time grows with the number
- Shows the number you missed
- Average person reaches about 7 digits
- Personal best saved on your device
Frequently asked questions
How many digits can most people remember?
About seven, which matches the well-known research on short-term memory span. Anything above ten is genuinely unusual without a memorisation technique.
Any tips for going further?
Chunk. Reading 4 8 2 9 3 1 as "48 29 31" turns six items into three, and three is easy. Saying them aloud helps too.
Is my score sent anywhere?
No. Your best is stored in your own browser and never leaves the device.
Keep going
People who use this tool usually reach for these next.
Squares flash on a grid. Tap them all back.
Repeat a growing sequence. How many can you hold?
Click the numbers in order — after they vanish.
Unscramble as many words as you can in 90 seconds.