A Memory Card Matching Game With CSS 3D Flip and Immutable State Memory / concentration / 神経衰弱 — every culture has a name for the same game. Flip two cards, see if they match, try to clear the board. The game logic is about 100 lines of pure functions; the interesting bits are the CSS 3D flip animation and the state machine that handles "two cards showing but not yet matched". Matching games a