How Do You Create Your Own Game Variant In Halo 3?

Question

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Answer 1

Well you go into the Custom games lobby (where you play infection capture the flag etc.) Now you press X (blue) to get up the options (for infection zombie settings). Choose your options before going back to the options screen (when you first press X) And press X, Which is to save the game-type. You can choose what game-type it is by selecting though in the lobby under the switch lobby title.

:D