Quake 4 - Xbox 360

Play as space marine Matthew Kane, an elite commando with a mysterious (and possibly checkered) past whose reputation as a tough soldier precedes him. Kane has been drafted into Rhino Squad, one of the squads of space marines currently assaulting the planet Stroggos, home of the strogg aliens.
Collect incredible new weapons -- from the standard shotgun and grenade launcher to the new Dark Matter Gun
Fight with the support of an elite squad, using tactical skills to prevail over a deadly enemy
Battle outdoors using tanks and walkers
Compete online in fast action arena-style multiplayer games