Sliding Puzzle
PuzzleFree to playSlide tiles to complete the picture!
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How to Play
Sliding Puzzle is the classic 15-tile grid challenge. Slide numbered tiles into the empty space to reorder the board from 1 through 15 with the blank tile at the bottom right.
Only tiles adjacent to the empty cell can move. Solve in fewer moves for a personal best.
A 4×4 board has 15 tiles and one gap, which gives 15 tiles but roughly 10⁴³ reachable arrangements — and exactly half of all shuffles are unsolvable in the physical toy. This version avoids that trap: boards are built by sliding from the solved state, so every puzzle you get is guaranteed to finish.
There is no timer, so move count is the only benchmark worth chasing.
Controls
- Click tile next to empty space — Slide that tile
- Restart — Shuffle a new puzzle
Tips & Tricks
- 1Solve the top row first, then work downward
- 2Keep the empty space near the tile you are positioning
- 3Avoid moving solved tiles out of place unnecessarily
- 4Corner tiles are hardest — plan their final positions early
- 5Once you are down to the last two rows, treat each remaining 2×3 corner as a rotation rather than a set of slides
- 6Only four tiles can ever move at once, so every move is also a choice about where the gap goes next — plan the gap, not the tile
- 7Solving rows top-down means each finished row is locked; never break one back open except as part of a deliberate three-tile rotation
Frequently Asked Questions
Is every shuffle solvable?
Yes. Puzzles are generated with valid random slides from the solved state, so you never get one of the unsolvable arrangements that a physical tile shuffle can produce.
Is there a timer?
No timer — move count is your benchmark.
What size is the grid?
A 4×4 grid with fifteen numbered tiles and one empty cell.
Which tiles can move?
Only the ones orthogonally adjacent to the gap — up to four at a time, and never diagonally.
What is the goal arrangement?
Tiles 1 through 15 in reading order, with the empty cell at the bottom right.
How many moves does a good solve take?
Typical 4×4 boards take 50 to 120 moves for a careful human solve, so anything near 60 is a strong result.
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