Sonic II and this isn't it. Asterons sit on walls in the Metropolis Zone waiting for someone to come past - and when they do, the star-shaped creatures explode, loosing off five missiles in different directions. Sonic and Tails can't destroy Asterons, they can only avoid their shots. Luckily these shooting stars have to wait so long between visitors that many of them are fast asleep. Only the ones that move are dangerous.