Memory Match

Flip cards to find every matching pair. Train your memory and finish in as few moves as you can.

Concentration is one of the oldest card games still played, and it is the standard task for measuring visuospatial working memory — which is the psychological term for how many locations you can hold at once. The usual finding is about four items, far fewer than people assume.

Optimal play is not simply remembering everything. When you flip a card you have not seen, the best move depends on whether you already know a match for it, and there are positions where deliberately revealing a card you cannot pair is stronger than taking a known match immediately, because it denies your opponent information.