Rat-o-Tron 1.0 by Genghis Games

Dominate the sewer pipes and be the biggest rat in town. Lead your rodents to the light of day and neighborhood garbage cans. Breed new rat soldiers, secure control of cellars and backyards, eat up (literally) rival rat gangs. Beware of alligators, snakes, and canal workers but keep in mind: they all are a potential food source. Every bit as good as farm animals, cats, and dogs. And yes: that also means puppies. Be ruthless and paranoid or your minions will find you too to be a good food source.