Game Introduction: SA is a study of extraterrestrial biology biotechnology companies, they privately plan to do some evil, and now you must go to SAC2 base and investigate the theft of antibody ~ Dick, your code is 21, Emma, the code you are 12 ... In this set, they finally smoothly into the SA, and get the antibody, but Emma is hurt, you must enter alone to protect her ... the first person 3D shooting game Double cooperation is very cool, very fun ~ Play: Players 1, mouse shooting, player 2, enter key (Note: Game has 8M, load please be patient, get stuck, please refresh or change lines)