Control your black hole, eating up everything on your way. The bigger you get, the larger structures you are able to suck in. Keep an eye on the opponents’ size, too. They can eat you.
Control your round hole and consume everything on your path: cars, houses, people! Engage in battles with other holes in the same city. Grow bigger and more powerful but beware of other players and their holes may be bigger than yours and pull you in.