Number Span

Digits flash one at a time. Type them back in order, then backwards. Clear both and the next string is one digit longer. The classic digit-span test of working memory, as a game.

3 → ∞ digits
3 lives

How to play

Watch. Digits flash one by one, starting with three.
Type. Type them back in order, with your keyboard or the keypad.
Reverse. Then type the same digits backwards, last one first.
Grow. Both right: one more digit. A miss costs a life and shows the answer. Your score is your longest span.

Quick tips

Chunk it. Group digits in twos or threes, like a phone number: 4-8-1 becomes 481.
Say them. Repeat the digits silently as they flash. The inner voice is a memory buffer.

3 more tips in the Number Span guide →