About the Sliding Puzzle
The 15 puzzle is a classic sliding tile puzzle invented in the 1870s. Fifteen numbered tiles sit in a 4×4 frame with one empty space; slide tiles into the gap until they read 1 to 15 in order. Our shuffle always produces a solvable arrangement, so every game can be finished.
Is every shuffle solvable?
Yes. The board is scrambled by making many random legal slides from the solved state, which can never create an unsolvable arrangement.
How is my best score measured?
By the fewest moves to solve. Your best is saved locally in your browser. The timer is shown for reference and to help you race yourself.