http://www.1up.com/do/previewPage?cId=3144354&did=1
First the good news: Rare's big-budget shooter Perfect Dark Zero is all set to debut alongside the Xbox 360 on day one of its launch, November 22. Then, the even better news: We finally got our hands on Zero for some single-player and co-op game time, and it's looking good -- both literally and figuratively.
But enough about the controls -- what we're really excited about with Zero are all the different ways to play through the single-player levels; this game has been designed from the ground up for serious replayability. Playing solo, the objectives and routes through a level change depending on which of the four difficulties you choose (Agent, Secret Agent, Perfect Agent, and the unloockable Dark Agent mode). The harder modes will add goals -- say, kill three snipers in three seconds, or grab a briefcase -- that can take you to all-new areas. In co-op (splitscreen or over Xbox Live), the second player can access more previously off-limit sections. For example, one of the Hong Kong levels begins with Joanna on a rooftop and her father Jack (controlled by the computer in single-player and by player two in co-op) on the street below. Separately they fight their way through the level, helping each other out now and then -- Joanna might take care of a few snipers before they have a chance to get a bead on Jack, and he in turn will open a few doors she can't on her own. The only way you'll ever see Jack's half of the level is by playing as him in co-op.