Number Memory Test

🕹️ How to play

1. How to play the number memory test: Tap Start and a string of digits appears in the middle of the screen while a bar counts down underneath it. When the bar empties the digits vanish for good, so use those seconds to memorise them.
2. How to answer: Empty slots replace the digits. Type them back in the original order on the keypad below, use backspace to fix a slip, and submit a partial answer if that is all you kept.
3. How the digit count grows: Tap the check mark to submit; only a perfectly ordered answer counts. Two correct in a row adds a digit, two misses in a row ends the run, and the HUD light tells you which one is at stake before you type.

📖 Rules & variants

Core rule: each string is shown exactly once and cannot be replayed. You have to type every digit back in its original order — there is no partial credit. Round one is 3 digits and the first digit is never 0.

How the length moves: length is the only difficulty axis. Two correct answers at the same length promote you by one digit. A miss neither demotes you nor ends the run; it simply deals another string at the same length. Two misses in a row end the run. 12 digits clears the game, and an optional endless run continues up to 20.

Display time: the window is length x 800ms + 1000ms, capped at 12 seconds, so longer strings get proportionally longer looks — the difficulty is memory load, not reading speed. The bar turns amber for the final second. The display cannot be skipped and there is no replay button anywhere.

Scoring: your score is the longest string you recalled correctly in that run, shown next to the furthest length you reached. Tier names are deliberately coarse and playful (warm-up, holding steady, the seven barrier, sharp, rare, cleared, endless); there is no comparison to other players and no age conversion. A run that never lands a single string writes no record at all.

After a miss: the verdict card lines your answer up under the correct string in the same groups of three, strikes through the digits that do not match, and names the error family — order swapped, digits missing, digits added, or wrong value — with the exact positions. That is the only feedback worth practising against.

Where it runs and where scores live: it plays in the browser with no download and no sign-up, and the game itself makes zero network requests. Answers go through a keypad drawn on the page rather than a text field, so no system keyboard ever pops up on a phone. Your best length, today's best and the last 20 runs live only in this browser, are never uploaded, and can be wiped from the settings drawer.

Practice mode and two players: practice mode lets you pick the display speed (1200 / 800 / 500 ms per digit), start anywhere from 3 to 12 digits and switch on colour distraction — and it records nothing. In the two-player pass-the-phone mode you take turns setting each other's strings over 6 rounds whose lengths are fixed at 4, 4, 5, 5, 6, 6, so nobody can hand out a 12-digit monster. A correct recall scores for the recaller, a miss scores for the setter, and ties go to overtime in symmetric pairs of rounds up to 12 digits.

❓ FAQ