Blocked - Rescue the Block! ($0.99) is the first entry in the Kindle Active Content arena for Nice Games. It looks interesting and the price is right (and the only low review is another whine from outside the US, where no Active Content can be sold).
Game Description
Blocked is a sliding block puzzle game.
The object of Blocked is to slide a single marked block off of the board. However, your way is blocked by a series of other blocks. You must slide the other blocks in the right order to clear a path for the marked block to exit.
You can choose from four different difficulty levels: Easy, Medium, Hard and Very Hard. Each difficulty level increases the number of blocks you must manipulate before solving the puzzle. Each of the four difficulty levels has 36 puzzles, for a total of 144 total puzzles to choose from. While easy levels have fewer blocks and can be quick, more difficult levels with many blocks can be quite challenging.
Each puzzle tells you the minimum number of moves required to solve the puzzle. Challenge yourself to finish all of the puzzles with the fewest moves!
Puzzle lovers of all ages will enjoy Blocked!