Sam Loyd, America's puzzle-expert, claimed himself to be inventor of this popular number puzzle which "drove the whole world crazy" around 1890's. A slide puzzle with square pieces can only be solved when the number of exchanges necessary to solve the puzzle is even, making it a very challenging game. Now play this game on your iPhone/iPod/iPad.
What's New in Version 1.1
A completely redeveloped more appealing USER INTERFACE.