Your goal is to help green and red cyclops get to their corresponding platforms. A Box can transform into a ball, a ball can transform into a box.
Use your mouse. First you must get the boxes transformed to balls by clicking on them. When they reached to the platforms with same color of themselves, reclick on them to get them transformed to boxes again. So they can stand still in the platform. If you are about to be failed, feel free to push "R" button to reset the level.