You must control the rotating coloured Magic Cristals. All you have to do is make sure that the floating coloured Magic Cristals meet with the correct colour of your rotating Magic Cristals to clear each level.
To control the position of your self rotating Magic Cristals simply use your mouse.
Clean up all the floating Magic Cristals in order to get to the next level.
Clear all levels to win! Addictive? Barely legal!!