Number Memory — free online memory game
About this game
The digit span test is the oldest measure of short-term memory in psychology — most people top out between 5 and 9 digits. This is the full growing-span version: one more digit every round, one mistake and the run ends.
Want your baseline first? Take the Short-Term Memory Test — a 2–3 minute standardized version of this task with a population benchmark, then come back and train on it.
How to play Number Memory
- 1A number flashes on screen — memorize it.
- 2Type it back exactly.
- 3Each round adds one digit. One mistake ends the run.
What Number Memory trains
Digit span is the raw capacity of your verbal short-term memory — the mental loop you use to hold a phone number or a PIN. Training it improves chunking: grouping digits into meaningful pieces so 4-7-1-9-3-2 becomes two chunks instead of six items. Better chunking shows up everywhere numbers appear in daily life.
Category: Working memory · Scoring: Digits in digits
Tip: Chunk digits into groups of 3–4, like a phone number.
What is a good digit span score?
The average person holds about 7 digits — the famous 'seven, plus or minus two' from Miller's 1956 paper. Reaching 9–10 digits puts you above average; memory athletes reach 20+ by chunking digits into images instead of sounds.
How do I remember more digits?
Chunk aggressively: read 529814 as 529-814 or '52-98-14', like a phone number. Rehearse the chunks out loud once, then type. Adding a rhythm to each chunk gives your brain a second cue when recall gets hard.
Is Number Memory free?
Yes — Number Memory is completely free, with no account, no signup and no downloads. Scores are saved privately in your browser, and you can install MemoryGames as an app from your browser menu if you want it on your home screen.