Gemlogic is a gem-based puzzle game, much like the one we all know. This one's a little different though since all moves are allowed, and the difficulty lies in getting to the highest level without your life running out. The higher the level, the more difficult it becomes.
There are three difficulties, beginner, intermediate, and veteran, each offering a different sized board (5x5, 6x6, and 7x7 respectively). Also, the higher the difficulty the faster the life meter decreases. http://www.spiffyware.net/iphone-gemlogic.php