Infinite money.
Destroy an entire avenue littered with zombies in Zombie Avenue! Drive up and down the avenue shooting buildings with your cannon! Zombies will poor out like salt coming out of a salt shaker! Shoot and run them over while upgrading your army of vehicles! Upgrade from missiles to eventually getting a rapid fire laser! You can even get a squad of tanks and helicopters! How fast can you kill every zombie?
WASD moves.
Mouse aims, click to shoot.