Classic brain teaser: Move numbered tiles into order by sliding them into the empty space. Start with the beginner-friendly 3×3 and level up to 4×4 or 5×5.
Works everywhere: On desktop, click tiles. On mobile, tap tiles. Your best moves and best time are saved on this device (local-only).
New to sliding puzzles? Read the 15-puzzle guide for rules and solving tips.
Goal: Arrange tiles in order from 1 to \(N^2 - 1\), with the empty space in the bottom-right corner.
Moves: You can only slide a tile if it is directly next to the empty space (up, down, left, or right).
Strategy tip: Try solving row-by-row. Finish the first row, then the second, and so on—keeping the empty space close to the tiles you’re positioning.