Rotate the wheels until all colors are correclty grouped. You don't need the groups to be exaclty the same as in the image, but the central vertical intersection should be of one color.
How to play
Drag each wheel and move to rotate (with mouse pointer or by touching)
The less movements, the better the results. Each consecutive movement on the same wheel does not count as a new movement. Only when you move a different wheel a new movement is generated. You can see that the God Number is 13, so you can know that you've done the best possible solution if you don't make more than 13 steps.