Do you think you are smart enough??? Then try and win in the ultimate 15 Puzzle Challenge! Become the ONLY master of the classic puzzle game! Invented more than 100 years ago this simple puzzle game remains popular among puzzle lovers around the world. The object of the puzzle is to place the numbered tiles in order in a 4x4 square by making sliding moves that use the empty space. 15 Puzzle Challenge is offering you great chance to refresh your skills in the well-known puzzle game. All of us