Logic GamesLogic & pattern practice
Zip guide
Plan a complete path through numbered checkpoints.
Puzzle practice guide
How to play 15 Puzzle
Plan sliding-tile cycles and preserve solved sections.
Practice the 15 Puzzle online by sliding numbered tiles into order. The empty cell is your working space, so each move changes both a tile’s position and your next available move. A consistent solving method is more useful than chasing whichever tile currently looks closest to home.
01 / The essentials
15 Puzzle rules
- Slide a tile next to the empty cell into that space. Only horizontal and vertical neighbors can move.
- Arrange the numbered tiles in ascending row order, with the empty cell at the bottom right.
- Tiles cannot be lifted, swapped directly, or moved diagonally. Use cycles through the empty space to rearrange them.
02 / Build the habit
15 Puzzle strategy
Solve a stable boundary
Begin with the top row, then work on the left edge of the remaining area. Once a section is correct, keep later cycles inside the unsolved region whenever possible.
Plan the final pair together
The final two tiles of a row need coordinated positioning. Placing one permanently too early can block the other. Prepare the pair in the open area, then rotate them into place together.
Track the empty cell
Before a sequence, decide where the empty cell must finish. Moving a tile nearer its target is not progress if the empty cell ends up trapped on the wrong side of the next tile.
03 / Worked example
The finish may be a short slide
If the first three rows of a 4×4 board are solved and the last row is 13, empty, 14, 15, slide 14 left into the empty cell, then slide 15 left. The result is 13, 14, 15, empty. No solved row needs to move.
04 / Put it into practice
A 15 Puzzle practice plan
- Solve a board slowly while preserving each completed boundary.
- On the next board, pause before the last two tiles of each row and plan their entry together.
- Replay for fewer unnecessary moves, then use a new board to check whether the method transfers.
A common mistake
Avoid repeatedly undoing a solved row to chase one tile. Also, an arbitrary hand-built tile arrangement may be unsolvable; use the trainer’s puzzle boards for practice.
Is the 15 Puzzle a Sudoku variant?
No. It is a sliding-tile puzzle. The numbers identify tiles and their target order; they are not row, column, and box constraints like Sudoku.
Guide updated . Rules describe the version on Logic Games.