Memory Match

Memory Match is a card-pairing game with four difficulty tiers that change both the grid and the pressure: Easy lays out 6 pairs on a 4x3 board with 3 Peek hints and a 120-second limit, Medium uses 8 pairs on 4x4 with 2 hints (90s), Hard packs 12 pairs into a 6x4 grid with a single hint (60s), and Extreme crams 16 pairs into an 8x4 grid with zero hints and only 45 seconds. Cards are dealt by a Fisher-Yates shuffle of duplicated emoji and you flip two at a time; a non-match flips back after 1 second while a match locks in after 500ms. You also pick from eight emoji themes - animals, food, sports, nature, faces, travel, flags, and tech - so the same board can be re-skinned for vocabulary practice or just variety, and your difficulty, theme, and mode choices persist in localStorage between sessions.

Four game modes reshape the goal. Classic has no clock; Timed runs the difficulty's countdown and ends the game at zero; Speed both counts down and weights the score toward fast finishes; and Zen is a relaxed mode that deliberately records no statistics. Scoring is an explicit formula rather than just a move counter: each match is worth 100 base points, a move bonus rewards efficiency as max(0, (pairs x 2 - moves) x 10), and a time bonus is applied - in Speed mode it is (timeLimit - seconds) x 5, otherwise max(0, 500 - seconds x 2). The whole sum is then scaled by a difficulty multiplier of 1x for Easy, 1.5x for Medium, 2x for Hard, and 3x for Extreme, so harder boards are worth proportionally more. There is a combo system on top: matching two pairs in a row within 3 seconds increments a combo multiplier that adds combo x 50 bonus points and triggers a larger 10-emoji particle burst (versus 6 for a normal match).

Two limited power-ups assist you mid-game: Peek briefly reveals every unmatched card for 1.5 seconds (consuming one of the difficulty's hint allotment), and Shuffle re-randomizes only the still-unmatched cards in place, leaving matched pairs fixed - useful for breaking a mental block without restarting. A turn is now a value with three states rather than a list rebuilt on every click: nothing face up, one card waiting for a partner, or two face up while you look at them. That matters more than it sounds. Each click used to compute the pair from the render it was dispatched in, so two clicks landing before the page could re-render both saw an empty list and the second replaced the first: measured on 2026-09-07 by firing both clicks in one task, the shipped version left TWO cards face up with zero moves counted and the turn never completed. The machine refuses an illegal click by name instead, and the same test now completes the turn correctly.

The deal itself was already right, which is worth saying: it is a real Fisher and Yates shuffle rather than the sort-with-a-random-comparator that appears elsewhere, and measured over 60,000 deals every card reached every position with a chi-square of 4.5 where 37.7 would be cause for suspicion, and a pair landed side by side one time in six exactly as a fair deal predicts. Peek also no longer fights with a turn in progress: it is a separate flag the board reads rather than something that sets and unsets the face-up state of every card.

All sound effects (flip, match, mismatch, combo, victory, a ticking warning under 10 seconds, and a fail buzz) are generated live with the Web Audio API by creating oscillators at specific frequencies rather than loading any audio files, so the game ships with no media assets and sound can be toggled off. Outside of Zen mode, a persistent statistics panel tracks games played, win rate, total matches, perfect games (winning in exactly 'pairs' moves), current and longest win streaks, max combo, and per-difficulty best scores and best times, all stored in the browser via localStorage.