Fifteen Puzzle-7

This is a sliding puzzle that consists of a frame of numbered square tiles in random order with one tile missing.

The object of the game is to place the tiles in order by making sliding moves that use the empty space.

Game features:
* There are five variants of puzzle with different size of the game field from very easy to hard level: 3*3, 4*4, 5*5, 6*6, 7*7;
* Move tile or group of tiles as in real game;
* Unlimited undo moves;
* Fast restart.