Build units in your Starcraft-like bases and send them out to go slaughter some Zerg. Large 10M game
After starting a new game, click on your hero (in the middle of the screen) and turn "selection lock" to ON, so you can click anywhere to move.
Your first step should be to go to Barracks and buy medic or firebat.
After that, just go out of the city and enjoy watching how your squad kills some zergs.