Superman – Metropolis Defender Flash Game at Y8 Flash. The daily planet has gotten news that meteors are going to hit Metropolis! Your mission is to help Superman smash the meteors before they hit the ground. For each missed meteor, the danger bar goes up. Be careful, some meteors are made of Kryptonite and can only be destroyed with your heat vision. Hit meteors to destroy them before they hit the ground. Touching Kryptonite meteors drains Supermans’s energy.Use your heat vision to destroy them.