Classic memory card-flipping game with difficulty levels, move counter, timer, and best score tracking.
The Memory Card Matching Game deals a grid of face-down cards onto the board, each card paired with exactly one match. A move flips two cards: a matching pair stays face up, a mismatch turns both back over. Difficulty levels change how many cards the grid holds, and the round is scored by a move counter and a timer, with the best round kept for comparison. The usual surprise: every two-card flip counts as a move, so the best possible score is exactly one move per pair, and a careless reveal costs you twice.
A concrete input and expected output from the current implementation.
Input
Play one round on an 8-pair board (16 cards) and win in 11 moves.
Expected output
All 16 cards end face up. The move counter reads 11, made up of 8 matching moves (one per pair) and 3 missed moves in which both cards flipped back. The timer shows the elapsed time, and the best-score row updates if 11 beats the saved best.
Every move flips exactly two cards, and each of the 8 pairs is matched exactly once, so 8 of the 11 moves are matches and the other 3 are mismatches. The move count can never go below the number of pairs, which is why 8 is the floor for this board.
Each move turns over two face-down cards. If the two symbols match, the pair stays face up and is removed from play; if they differ, both cards turn face down again in the same positions. The move counter adds one per two-card flip whether the pair matches or not, and the round ends when every pair is face up.
Difficulty changes the board size and with it the number of pairs to find. A timer runs from the start of play and stops when the last pair is matched, while the move counter records every two-card flip. When a round finishes, its move count is compared with the saved best, and the best-score row is replaced when the new round is better.
One move is one two-card flip, whether the two cards match or not. A mismatch still adds to the counter, so revealing cards at random is what inflates the score. The floor for any round is the number of pairs on the board, reached only when every pair is found in one move.
The clock starts with play and stops when the last pair is matched, so time spent planning before the first flip is usually free. There is no pause: reloading or closing the page abandons the round and a new one starts from a fresh shuffle. The best-score row is the only result that survives an abandoned round. If precise records matter, check the clock's start once with a stopwatch.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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