how to play

The 15 Puzzle (and its variants) is a classic sliding tile puzzle invented in the 1870s. Choose from 3×3, 4×4, 5×5, or 6×6 grid sizes.

Use arrow keys or swipe to slide tiles into the empty space. Only tiles adjacent to the empty space can move.

The goal is to arrange the tiles in order from 1 to N, reading left to right, top to bottom, with the empty space in the bottom-right corner.

Your score is your move count — fewer moves is better!