While cruising the void, you suddenly encounter waves of spinning discs. Some are minding their own business, but others are coming straight for you, trying to rip your ship to bits. You must remove these mechanical threats from existence.
Using an energy beam to increase the momentum of the blades, you try to have two similar discs to spin at the same frequency. When you succeed, the blades will make a connection that will finally have them self-destruct.