All the main halo games had basic customization for Spartans. Halo 1 had basic colors, halo 2 had more colors and a elite character, halo 3 had a few armor pieces to switch between for elites and Spartans and halo 4 had an assortment of armor pieces. Should there only be one spartan across all multiplayer engines? Or the same customizations as they had when the first launched to retain the feel of the original version?
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They already said they're not changing any of the engines and code. I'd bet it will be default Spartans across all games. But another theory is when you vote for say Halo 3 Team Slayer Snowbound the game will take you and the other players into Halo 3's matchmaking lobby before the game starts and you'll be able to go into the menu and customize your appearance for Halo 3 same with Halo 4. That's just one of the theories going around the internet atm. No one has really any clue how Halo CE and Halo 2 customizations will be handled if at all.