Slide Puzzle: Buffalo

These Fifteen need to collect images of bison. Make it is not easy, because the picture is composed of individual fragments, which are rigidly attached to each other. Each of the pieces has a square shape. In this puzzle there is one blank cell, which can be moved next fragments. On-site displaced fragment is formed a new, blank cell that can put another piece. Thus, portions are swapped, trying to take the right position in the figure.