Number memory
See a number, then type it back. It grows.
Length 3 digits
How to play
- Watch the digits.
- When they hide, type them in order.
- Each success adds a digit.
- One miss ends the run. The score is the longest length you recalled.
What this measures
Most people find a cliff somewhere between about 5 and 9 digits on a first serious try. Chunking, not staring harder, is what moves the cliff.
This is not a clinical digit-span exam. The timing and the interface are Mindz's.
Digit span, as a game
Number memory shows a string of digits, hides it, and asks you to type it back in order. Each success adds a digit. One miss ends the run. The score is the longest length you recalled, not the length you failed on. That distinction matters: the first miss should not be described as if you had held the longer string. Mindz keeps the best length on this device. The timing and the interface are ours. This is not a clinical digit-span exam, and it should not be quoted as one in school, work, or a medical visit.
Most people, without a special strategy, find a cliff somewhere in the middle single digits on a first serious try. That cliff is famous because working memory is a narrow bench, not a warehouse. The warehouse is long-term memory. The bench is what you can hold and work on for a few seconds. Researchers argue about the exact model. You do not need the diagram to feel the limit. Chunking is what moves the cliff. The number that looks like two years is easier than the number that looks like eight strangers. The bench did not get bigger. The code got shorter.
Strategy is allowed
Saying the digits quietly, grouping them in threes, or attaching them to a rhythm are all legal. Staring harder is the strategy that feels serious and usually fails. If you chunk, you are doing the interesting version of the game. Write down what the grouping was when you beat a level, because next time you will think the level was magic. It was a code. The article on working memory is the longer version of this paragraph, and the article on why we forget explains interference: new material bumps the string off the bench.
A notification during a trial is not a cognitive identity. Sleep, anxiety, and interruption explain a lot of ordinary failure. If forgetting is new, severe, or paired with other changes in daily function, that is a medical conversation. A game-over screen is not the conversation. Retake once after a pause before you treat a short run as a trait. Practice will improve your score. Most of that improvement is task learning. Mindz does not claim a general cognitive upgrade, and it will not dress this game up as brain training that raises IQ.
This number is not your mental age
Mental age is a self-report scale. Number memory is a span task. They belong on the same site because people who are curious about one are often curious about the other, and because both need a paragraph that says what they are not. A long digit span does not mean your Mindz age is young, old, wise, or quick. A short span does not mean the opposite. If you only have time for one activity, take the mental age test. Come back to digits when you want a toy that pushes a limit you can feel in under a minute.
Visual memory flashes a grid instead of digits. Sequence memory uses shapes and order. People often discover they have a preferred code: verbal, spatial, or rhythmic. That preference is a practical fact about study and about this site's games. It is not a hemisphere myth and not a personality type. The thinker quiz will happily offer you a type if you want one later. Keep it lighter than the span you just felt fail, because the failure was more informative than the nickname.
After the cliff
Stop at the cliff for the day. Coming back tomorrow tells you whether the chunking survived sleep, which is a better experiment than ten angry retries. Favorite the game if you want it listed. Try mental math if you want speed with sums instead of span. Try the memory test if you want words plus a grid. Try the focus timer if the lesson you actually wanted was a container for work, not a longer number.
The dashboard stores the best beside your other scores, your mental age if you have one, and your streak. That page is a view of this browser, not an account. A different phone will look empty. That is the trade for not handing the answers to a server. When you are done exploring, the mental age reading is the piece worth rereading. The digits were a game. The age is the metaphor the rest of Mindz is arranged around, with the disclaimer kept in the same breath as the number.
Stay with Mindz
Mental age is the main mirror. These games, tools, and quizzes look at one habit at a time, and they stay on this device.
Test
Mental age test
An entertaining estimate of thinking style, mapped to an age.