Picture for reference.
Defiant map pack was done by Certain Affinity
CEA graphics rework was done by Saber Interactive
CEA music rework was done by Skywalker symphony
Anniversary map pack was done by Certain Affinity
Halo 4 forge was done by Certain Affinity
Halo 4's CGI cutscenes were done by Digic Pictures or something
Majestic and Castle map pack were done by Certain Affinity
Spartan Assault was done by Vanguard Games or whatever it was called
So will 343 develop Halo 5 by themselves or will there be stuff outsourced like there already has been?
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Outsourcing part of your game development is really stupid. If your that undedicated that you have to give off portions of your game to be made by others.. it shows. Look at Aliens: Colonial Marines.. Perfect example of why you should NOT outsource your game.