15 puzzle

Slide tiles on a 4×4 grid to order 1–15. Always solvable; hints point at an improving move.

Moves: 0

Slide a tile next to the empty square.

The classic 15-puzzle on a 4×4 grid. The board is always solvable — it is scrambled by random legal slides, not random placement. Hint points at one improving move.

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How to use

  1. Slide a tile next to the empty square.
  2. Order the tiles 1–15.
  3. Use Hint or New game as needed.

What it supports

The classic 4×4 15-puzzle. Scrambling is a random walk of legal slides, so every board is guaranteed solvable — it is not a random permutation. The hint suggests one move that lowers total Manhattan distance; it does not solve the puzzle for you.

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