Object: Re-create the starting position (which shows nine monochrome squares).
 
At first click anywhere on the board to randomize the setup. You can then either click the centre of a square or a circle to rotate the colours in it. The rotation is always clockwise.
 
Variant 2 is played on a torus (imagine the top edge is connected with the bottom edge and the left border with the right one). The buttons at the border and at the corners are now also active.
 
 
More freeware as well as real puzzles and games at http://karl.kiwi.gen.nz.