HALO: EVOLUTIONS will feature a wide variety of tales set across the span of the Halo universe.
Halo ActionClix: WizKids will be debuting exclusive Halo 3 content as part of the debut of its Halo® ActionClix™ Collectable Miniatures Game.
HALO 3 RECON: Developed exclusively for Xbox 360 by acclaimed developer Bungie, Halo 3: ODST is a stand-alone expansion that extends the award-winning Halo 3 experience with hours of new campaign and multiplayer gameplay.
HALO 3: by DigitalPh33r For reasons unknown to Master Chief, Halo 3 multiplayer is exceptionally laggy and decides to give Devil May Cry 4 and Call of Duty 4 a shot, demonstrating a whole new level of suckage.
I wouldn't call Killzone 2 a "halo killer" because Killzone is on a totally different level than the overrated Halo series (especially Halo 3), nonetheless Call of Duty: Modern Warfare 4 already nuked Halo 3 out of this world