About the Sliding Puzzle

The Sliding Puzzle (also called the 15-puzzle) is a tile-arrangement classic. Numbered tiles sit in a grid with one empty space, and you slide tiles into that gap to shuffle them. The aim is to return every tile to its correct order — in as few moves as possible.

How to play

• Click or tap a tile next to the empty space to slide it across.
• Keep sliding tiles until they are all back in numerical order.
• Try to finish with the lowest move count you can.

Solving strategy

• Solve it in layers: complete the top row first, then the left column, and shrink the puzzle down.
• Set up the corners last in each row or column — they often need a small rotation to slot in.
• Plan two or three moves ahead rather than sliding tiles at random.

Why play?

Sliding puzzles are a classic test of spatial reasoning and planning — you have to think several moves ahead, which makes finishing in few moves genuinely rewarding.

Frequently asked questions

What is the goal?

Arrange all the tiles back into order using the single empty space.

What does it train?

Spatial reasoning and forward planning.

Is it free?

Yes, free to play with no sign-up.

Can I play on mobile?

Yes, on any modern browser.