Object: Recreate the original position.
 
To start playing, click the board to randomize the position.
Around the center there are two coloured rings. All positions in these rings move one step at a time. To achieve this, you click one of the round arrows at the bottom.
Also, the middle row and column of squares can be shifted.
 
You win if you can recreate the original position.
 
Variants : more complicated setups (and more difficult to solve).
 
 
More freeware as well as real puzzles and games at my homepage http://karl.kiwi.gen.nz.