Choose from two roles.Defenders, who defend the town from the attacking force.Defenders start inside the town and protect refinery towers on top of buildings.If the attackers destroy all the refinery towers then the town has been captured.
Attackers start south of town and must cross a bridge way before entering the town.Use both air and ground units to attack.You create units like the many matrix defense games.Your units spawn in your starting area for your use.
Build bunkers and missle turrets to hold ground.Limited use of all 3 races.Most terran units, dragoons, and zerglings are buildable.
Game starts with about 4 minutes to build up forces and create a defense.After so a new timer will start beginning the siege.Attacker must destroy the refinery towers within this time limit.
Attackers dont get tanks, but are able to build more units than the defenders.Attackers will get more money to use, but the defenders have the advantage of a defensive position.Attackers can overwhelm defending forces... but how agressive your attacks depend on how you win.