Number Memory Test
A number appears just long enough to read, then vanishes. Type it back from memory — each level adds a digit, and one slip ends the run.
Number Memory
A number flashes up, then disappears — type it from memory. Every correct answer adds a digit. The average person manages 7.
The classic finding is "seven, plus or minus two" — the number of items short-term memory comfortably holds, which is why most people fail around level 7–9 here. The way past it is chunking: 481529367 is nine things, but 481-529-367 is three. Everyone who scores in the teens groups digits into twos or threes and often says them silently in rhythm — the same trick that makes phone numbers memorable. Practice raises your score noticeably in days, though what you're training is mostly the chunking strategy rather than raw capacity.