The board starts with every card face down, hiding pairs of identical symbols. On each move you flip two cards: if they show the same symbol the pair stays revealed (a match), and if they differ they flip back face down after a short delay so you can remember where they were. The game is won when every pair has been matched. AnyTool tracks your moves and time as you go, and the fewer moves and the less time you take, the better your score.

Every new game builds a deck of pairs and shuffles it with a crypto-secure Fisher–Yates shuffle backed by the browser’s Web Crypto API (crypto.getRandomValues with rejection sampling). That means each possible arrangement is equally likely and there is no modulo bias — unlike tools that rely on the predictable Math.random. The shuffle runs entirely in your browser, so no layout or move is ever sent to a server.

When you win, the game compares your moves and time to your previous best for that difficulty and keeps the better result. The records are stored only in this browser’s localStorage on this device, so they persist between visits but are never uploaded, logged or tracked. Clearing your site data removes them, and best scores are kept separately for Easy, Medium, Hard and Expert.

Concentration-style matching games are an enjoyable, accessible way to practise short-term visual memory, focus and pattern recognition, and they suit all ages. That said, AnyTool Memory Game is meant as casual fun and light brain training, not a diagnostic or validated cognitive assessment — your moves and time depend on the layout, difficulty, theme familiarity and luck, so treat your scores as a personal high-score chase rather than a measure of memory ability.