As a united military forces of the whole planet, hold the line at all the directions from the green meadows of Europe and snowy Siberia to the burned cities. Use all the resources to protect your world from aliens.
Defend the space carrier with a turret by gunning down as many enemy spaceships as possible. Get additional help by sending out carrier fighters of your own.
Defend yourself and eliminate all your enemies to survive by placing towers at available spots in Antarctica. Use strategy and upgrade wisely. Best of Luck!
