Stunningly remastered campaign:

• Relive the award-winning adventure that defined "Halo: Combat Evolved" as one of the best games of the decade with breathtaking next-gen graphics and audio remastered for the Xbox 360. Engage in epic-scale battles against the backdrop of the eponymous "Halo" ringworld, and relive nostalgic memories with the ability to toggle Classic mode to play the original version.

Online campaign co-op:

• For the first time, experience the story that started it all with a friend on Xbox LIVE and launch a cooperative assault against the Covenant, whether you live across the street or halfway around the world. [Xbox LIVE Gold membership required for online multiplayer]

Classic "Halo" multiplayer maps reimagined:

• Wage battle on six detailed remakes of some of the most beloved "Halo" multiplayer maps of all time, and bring the fight to the Covenant on a stunning and resonant new Firefight map.1 Remastered in the "Halo: Reach" engine and inspired by maps from "Halo: Combat Evolved" and "Halo 2," these iconic battlefields reignite the heart-pounding multiplayer action of the original favorites and let you relive epic confrontations like you've never experienced them.
• Developed in collaboration with Certain Affinity, the new multiplayer maps are included on the "Halo: Anniversary" game disc, which means players will not need to own the original "Halo: Reach" game to play. The first of the new remakes to be revealed at E3 Expo 2011 will be the fan-favorite map Damnation.

New challenges and enhanced story:

• Unlock up to 1,000 Achievement points as you clash with online opponents and battle through the campaign, and uncover never-before-revealed backstories told in motion-graphic form that foreshadow new mysteries in the story of "Halo 4."