The n-puzzle is known in various versions, including the 8 puzzle, the 15 puzzle, and with various names. It is a sliding puzzle that consists of a grid of numbered squares with one square missing, and the labels on the squares jumbled up. The goal of the puzzle is to unjumble the squares by only making moves which slide squares into the empty space, in turn revealing another empty space in the position of the moved piece.

Now a mobile version of the puzzle is available for Nokia S60 3rd Edition mobile devices called Sixteen Puzzle for S60 (although it is in effect a Fifteen Puzzle game). This version supports screen rotation as well as moving puzzle tiles by tilting the device using the in-built accelerometer sensor. The idea of the mobile game is to shuffle the pieces and re-order them from 1 to 15, leaving the empty space at bottom right corner (#16).

Here are the keyboard shortcuts to use on your mobile device:

1 - Preview the image to construct
2 - 2×2 tiles
3 - 3×3 tiles
4 - 4×4 tiles
5 - 5×5 tiles
6 - 6×6 tiles
* - Full or Normal size display
# - Show or hide numbers
Left arrow - Move one tile leftwards
Right arrow - Move one tile rightwards
Up arrow - Move one tile upwards
Down arrow - Move one tile downwards

Click here to download 16 puzzle for Nokia S60 3rd Edition and place it in the Python scripts folder on your memory card.