memtry
Digit Span
A number appears, then vanishes. Type it back. It grows by one digit every round you survive.
How to play
- Press Show me and memorize the number
- Type it back on the keypad, or your keyboard
- Each correct answer adds a digit
- You have 2 lives
What it trains
Working memory. Digit span is one of the oldest tools in psychology and still part of modern IQ batteries like the WAIS. Most adults land between 6 and 7 digits forward. Later work argued the true capacity is closer to 4 chunks once rehearsal and grouping are stripped away, which is why phone numbers are written in blocks.
Miller, 1956; Cowan, 2001, Behavioral and Brain Sciences.
One honest tip
Group digits into pairs or triples as they appear. 8-1-4-9-2-6 is six things; 814-926 is two.