Based on the popular 15 puzzle, Picture Sliding Block Puzzle consists of a frame of numbered square tiles in random order with one tile missing. The object of the puzzle is to place the tiles in order by making sliding moves vertically or horizontally using the empty space. It may overwhelm you to learn that there are more than 20,000,000,000,000 possible different arrangements with the 4x4 puzzle that the pieces (including the blank space) can assume! Features: - A challenging puzzle - 3x3, 4x4, or 5x5 dimensions - Upload your own puzzle - Add a timer and try to beat your own time or relax without one - Customize the theme colors - Try beating your high score