Welcome to Halo Answers. What would you like to know?

You mean multiplayer maps? The only locked map at any point was Foundation, and it should unlock automatically now if the game is allowed to go online and update itself. Further maps past the default ones have to be downloaded or bought. Campaign levels are unlocked by beating the previous level on your profile, or by beating the level or any subsequent level in coop mode with another profile.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.