A 15 Puzzle (Game of Fifteen)

A 15 Puzzle is a sliding puzzle game consisting of frames of numbered squares in random order with one square missing.

The goal of A 15 Puzzle is to place the squares in ascending order from left to right and from top to bottom, starting with number 1 in the upper left corner and ending with a blank space in the lower right corner.

  It exists of four different sizes, 3×3, 4×4, 5×5 and 6×6 squares.

  It is played by placing the squares in increasing number order by making sliding moves
  that use the empty space.

  It can use photos from your smartphone.

  It can also use coloured squares.

  It has a score board with the best score result.

With A 15 Puzzle you can leave an ongoing game at any time and start again from this point.