If your a fan of AVP then you should try this game. You get to play 3 stories, The Marines, the Aliens, the Predators. The Marines you get a few weapons to choose you get to block the enemies attacks by blocking your weapon your holding. Objective of the game is mostly kill the aliens and predators. The alien story is pretty sick you can stealth kill your enemies and plant babies. The Predator is awesome as well with all these awesome gadgets you get your basically invincible.