15 Puzzle - Version 4.0 In this puzzle you must move squares round a grid to place them in order. If you can't solve the puzzle, it will solve itself before your very eyes. With this program you can transform your favorite pictures (in bmp, gif, jpeg, pcx, png, tiff, or xpm format) into classic sliding puzzles. Also contains the Rate your mind pal puzzle. A clever variant of Sam Loyd's famous 14-15 puzzle. We made this program just for fun and you can use it for free! The algorithm is developed and programmed by students of THRijswijk (now part of The Hague University).