15 Puzzle
Slide numbered tiles into order.
Moves: 0Goal: 1-15 in order, blank bottom-right
Click a tile next to the blank to slide it. Arrow keys also work.
About
The classic sliding puzzle. 15 numbered tiles on a 4x4 grid with one empty space. Slide adjacent tiles into the empty space until they're in order 1 through 15.
How to use
- Click an adjacent tile to slide it.
- Get them in order from 1 to 15.
FAQ
Is it always solvable?+
Half of all random arrangements are unsolvable. This generates only solvable boards by shuffling from the solved state.
What's the optimal worst-case?+
80 moves for a 4x4 board. Solving from any state takes at most 80 moves with perfect play.