picPuzzle is a fairly easy game to learn and it challenges your problem solving abilities. Each game you are given a picture that is randomly mixed. The picture is divided into 16 squares and one square is blank. You must rearrange the picture to form the original picture.
To move a square in any direction you tap on the block that is adjacent to the blank square.
The initial setting has the the help feature on. You can change the game setting to display the square number on each square. The game ends when you have completed the puzzle.