Earthlings have prepared a powerful air defense, since an alien invasion has become a matter of time after alarming reports from astronomers. The complex was called NOVAGUARD and you will manage it. Watch out for dangerous and unidentified objects appearing in the sky. First, stones will fall from the sky, and behind them small and then larger alien devices will appear. Point your sight and a rocket will be launched there. Don't allow a breakthrough, the target's explosion can trigger a chain reaction and nearby falling objects in NOVAGUARD will be destroyed.
