Is a 15-puzzle.15 puzzle will fall into sliding block puzzle.The rules of the game, block of space and one of the number 15 is placed on the screen from the first one.When you press the start button, you will be by numbers from 1 to 15 if the random.It becomes clear if it is possible to align to the state before pressing the start by using the block blank this number.15 This puzzle is difficult to clear, but you can concentrate on the puzzle minutes.So it would be really time too in no time if you play in my spare time.