🔢 Slide Puzzle

Slide puzzle to rearrange numbered tiles from 1 to 15. Click and slide tiles adjacent to empty squares. Compete for time and number of moves.

number of moves (in go, shogi, etc.)

0

time

0:00
Click on a tile to start

treatment

  • Click on a numbered tile adjacent to a blank square to slide it
  • Can also be operated with the arrow keys (blank squares move in the direction of the arrow).
  • The puzzle is completed when the bottom right corner is left blank.
  • The fewer moves and less time required, the higher the score.

What is Slide Puzzle?

A slide puzzle is a classic brain-teaser game featuring numbered tiles arranged in a grid with one empty space. Your goal is to rearrange the tiles into sequential numerical order, typically from 1 to 15. This timeless puzzle challenges both patience and logical thinking, making it an excellent way to exercise spatial reasoning and problem-solving skills.

How to Use

Simply click on any tile adjacent to the empty space to slide it into that position. Each click shifts tiles strategically as you work toward the correct arrangement. Start by organizing the first row or corner, then systematically complete subsequent sections. The game tracks your move count and elapsed time, allowing you to measure progress and compete on solving speed. Work methodically rather than randomly—planning your moves ahead prevents getting stuck.

Use Cases

Slide puzzles serve multiple purposes:
• Quick mental breaks—five-minute brain exercises during work or study sessions
• Skill development—training spatial reasoning and planning abilities essential for logical thinking
• Friendly competition—challenging friends and sharing completion times
• Stress relief—meditative gameplay that reduces anxiety through focused, methodical problem-solving

Tips & Insights

Experienced solvers use systematic strategies, working in sections rather than solving randomly. Complete one corner fully before moving to adjacent areas. Mathematically, only half of all possible tile configurations are solvable—the puzzle's state determines whether a solution exists. Corner and edge pieces should be positioned first, as rearranging them later creates complications.

Frequently Asked Questions

How to operate?

Click on a numbered tile adjacent to a blank square to slide it. You can also use the arrow keys.

Can the shuffle always be solved?

Yes, the shuffle algorithm only generates patterns that are always solvable.

What is the difference in difficulty level?

Easy is 3x3 (8 puzzles), normal is 4x4 (15 puzzles), and hard is 5x5 (24 puzzles).

How is completion determined?

The list is ordered from 1 to 1, and if there is a blank space in the lower right corner, it is cleared. A message is displayed when it is cleared.

Can I undo my moves?

No, this tool doesn't support undo functionality. Each move is permanent once made, so think carefully before sliding tiles. This keeps the puzzle challenging and forces you to plan ahead strategically.

What's the minimum number of moves needed to solve a puzzle?

The optimal solution varies depending on the shuffle, but typically ranges from 20-60 moves for standard 15-tile puzzles. You can challenge yourself to solve it in fewer moves by planning a sequence before executing it. Some shuffles have mathematically shorter solutions than others.

Can I play with different grid sizes?

This tool focuses on the classic 4×4 (15-tile) puzzle format. Larger or smaller grids may be available depending on the implementation, but the standard version uses the traditional 15-tile configuration that's been popular for over a century.

Is there a time limit for solving the puzzle?

No, there's no time limit. You can solve at your own pace without pressure. However, some difficulty levels may track your solve time to compare with other players' records.

Can I share my best score with others?

Sharing features depend on the implementation, but you can typically take a screenshot of your completion screen. Some versions allow you to compete on leaderboards or share results on social media.

What happens if I close the browser during a game?

Your game progress is not saved by default, and you'll start a fresh game when you return. This tool uses client-side functionality without persistent storage, so each session is independent.