About Sliding Block Puzzle
The Sliding Block Puzzle — the classic 15-puzzle — is a single tile short of a full grid. Slide tiles into the gap one at a time to arrange the numbers in order (or to rebuild a scrambled picture). Easy to start, tricky to finish neatly.
How to play
- Tap a tile next to the empty space to slide it in.
- Only tiles adjacent to the gap can move.
- Arrange all tiles into the goal order to win.
Tips & strategy
- Solve the top row and left column first, then shrink the puzzle.
- Finish the last 2×2 block by rotating tiles around the gap.
Frequently asked questions
What is the 15 puzzle?
A 4×4 sliding puzzle with 15 numbered tiles and one gap; you slide tiles to put the numbers in order.