Simple but Addictive game!
This app can be enjoyed by adults as well as children.

The rule is simple.
Slide the number tiles into a blank space, and arrange them in numerical order.
There are three different levels; 8-puzzle(3x3), 15-puzzle(4x4), and 24-puzzle(5x5).

This app is the lite version of NumPuzzleAndPicPuzzle. The first 5 pictures are available.
Though the rule is the same as NumPuzzle, you will find it wholly different from NumPuzzle, and might think it is unexpectedly difficult.