Your mission in this strategy game is to build and upgrade turrets, power stations, refineries, use air raids to defend command center from attacking enemy forces. Everything you need to know is described in the tutorial, I recommend you to check it out. I learned that it is sometimes better to upgrade guns than buy new ones - and buying a laser turret instead of the plasma one is sometimes better - it costs less to upgrade to the same strength as the plasma one. Use YOUR MOUSE to control the game. Have fun!