Unblock Me Free is the free version of Unblock Me, a simple but stylishly made puzzle game in which you solve spatial challenges involving rectangular wooden blocks.
The gameplay and interface are fittingly simple: you use your touch screen to slide blocks back and forth inside a tight grid (only left and right, or up and down, depending on the block's placement), maneuvering them around in sequence so that you can slide a red block out of the grid. This setup is the same on every level, but each time you have to move a different set of blocks in a different order so that the red block can "escape." The free version comes with 800 short puzzles--more than enough for hours of play, at Beginner, Intermediate, and Advanced levels--and two game modes, a free-form "Relax" mode, and a "Challenge" mode that counts your moves and gives you a rating (one to three stars) for each puzzle.
The App Store has countless puzzle games, but Unblock Me is one of the most elegant. The free version is an excellent value for fans of this genre.