14 Puzzle is a variation of classic Fifteen puzzle game. Unlike Fifteen, 14 Puzzle uses triangular board making the game the most challenging Fifteen puzzle game ever. The object of the puzzle is to place the tiles in order starting from 1 at the top all the way to 14 in the bottom right by sliding tiles into empty space.
If 14 tiles is not challenging enough for you, you could always increase the size of the board and number of tiles to move. All in all the game is not just one but four puzzles (and even 5 on the iPad): "14 Puzzle", "20 Puzzle", "27 Puzzle" and "35 Puzzle".
Finally, 14 Puzzle is integrated with Facebook. Once Facebook integration is activated the time it took you to solve the puzzle is posted to your Facebook wall so you could brag how fast your brain is and challenge your Facebook friends.