Prepare your defense against the oncoming waves of creeps. Don't let them complete the path. Do that by building your base that consists of defense towers along the way.
Humans are all dead and only zombies are alive who have now turned on each other for food. You're one of the zombie factions and must destroy others to survive now.
Across the world terrorist threats are becoming a serious problem. Every country in the world today is deploying special forces to eliminate and neutralize terrorist threats. Destroy terror camps that are training terrorists.
Help the space rebellions to drive the evil spacelord out of the Minoria system. Deploy, defend and attack their solar systems to take control of the galaxy.