Picture Puzzle

We have any picture which includes certain number of pieces. When picture is presented to user, all pieces are located randomly and one of the piece is empty. Our goal is drag all randomly located pieces to correct places to complete the picture. For this, user should drag any available piece to the empty space. Each piece can only be dragged one step and each piece can only be moved in the empty space.
The game has two modes: easy mode and difficult mode.
In easy mode, we can move a piece of picture right, left, up, down and diagonally.
In difficult mode, we can move a piece of picture right, left, up and down.
It's very enjoyable memory game