"Move 15" problem at the end of 1878 in the United States invented by the Anonymous. The next "15 Problems" hot start in early 1879, the same year craze swept Europe. That is a slider from the rearrangement of the 19th century, foreign 15 games, about 15 disorderly arrangement of the figures, the game will be a picture divided into 16 identical boxes, random arrangement, which has a box at the beginning of the game before the hidden, so that other boxes use the box moving in the right location to form a complete shape. the game with nearly more than 30 paintings for users to choose sheets, image-rich, that is, develop intelligence, then entertainment, is 100 play not tire of a game.