Again, you become shoulder to shoulder with your buddy to win the clash in the co-op. UFO will toss you every move colored balls that you together with your friends have effectively broken down into such small pieces until they go away. Try not to lose your chance. Good luck! Don't forget about the cooperation mode - none of you do here things happen on their own. Only through the combined forces get rid of aliens who have decided to disrupt peace on earth. To work before it's too late!