[url=http://www.youtube.com/watch?v=t9EjglYJrtcI]50 "Secret" Unused Gametypes and Medals[/url] that were found in the game.
Some of these include infection, race, juggernaut, and assault.
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I barely know anything about game design, so somebody tell me if I'm wrong, but since Halo 4 is based off of the Reach engine and previous hardware, wouldn't it make complete sense that some things were accidentally kept? Oh, and the [i]"GOOOOAAAAALLL!"[/i] sound effect was hilarious.