How to solve the 15 puzzle

Sliding 15-Puzzle - Simulator and solution

15 Puzzle: 3x3 4x4 5x5 6x6 by Indygo Media

Why the 14-15 puzzle is impossible, and how to solve it anyway

Fifteen Puzzle - ThinkFun

14-15 puzzle / Boss puzzle

Solving the 15-Puzzle. The 15-Puzzle is a simple puzzle you've…, by Preston Jensen

The Fifteen Puzzle Deluxe

You'll solve a variant of the 15-puzzle, something I

Challenge VI: 15 Puzzle solved by Boorglar and mfb

Fifteen Puzzle - Copyright J. A. Storer