Memory Card Game

A memory card game — flip two face-down cards at a time to find matching pairs. Remember card positions to clear the board in fewer tries.

Pick a difficulty (6, 8, or 12 pairs), then click cards to flip them. Flip two in a row — if they match, they stay open; if not, both flip back after a short delay. Once all pairs are matched, your move count and time are shown. Use New game to reshuffle the same difficulty.

Moves, time, and your best record are stored only in your browser (localStorage) and are never sent to a server.

Psychologist George Miller's famous 1956 paper argued that people can hold roughly 7±2 items (5 to 9) in working memory at once. Mapped onto this game's difficulty levels, Easy (6 pairs = 12 cards) has only 6 distinct images, comfortably inside that range, so you can track card positions without much strain. Hard (12 pairs = 24 cards) jumps to 12 distinct images, which clearly exceeds that range — memorizing every card individually gets noticeably harder, which is why the 12-pair board tends to demand a different approach than simple rote memorization.

Miller's paper also introduced chunking — grouping individual items into larger meaningful units to remember more effectively. Applied here, instead of memorizing all 24 cards (12 pairs) one by one, you can divide the board into regions and remember them as groups — "the top-left block had an apple and a banana" — which reduces the number of units you actually have to track. A mismatched pair also flips back automatically after 800ms, giving you a brief window to rehearse the positions and fold them into a chunk before your next attempt, which can cut down your move count over time.