Headhunter: This mode is similar to Oddball mode where players drop skulls when they die. The object is to grab as many as you can and drop them off in a deposit zone. It seems you can carry multiple skulls at a given time, but if you get fragged you drop them for others to pick up. Headhunter can be either played as a team game or free-for-all.
Stockpile: This mode is Halo's version of Capture the Flag. Flags points appear randomly across the map and the object is to grab them and return them to their capture points.
Generator Defense: This is the game mode which appears only for the Overlook map within the Beta. Basically it's Spartans pitted against Elites in 3 on 3 action. The Elites try to destroy generators that are defended by the Spartans.
Invasion: Looks like Bungie is tight lipped on this game mode, sorry.
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