There is an option on the main screen to go into Forge World. There you can pick any map that you want to create a custom game in. You get a "budget" on items you can put in the map do to only a certain amount of storage on a map. When you are done you can set the game to a certain game mode that it needs to be played on for it to work. Now if your talking about creating a game mode like team swat, fire fight, etc. you cant only Bungie does that.
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yes halo reach will have custom games. it will also have an amazing campaign, all kinds of game modes for matchmaking and custom games, and the thing i am most excited about it will have firefight with matchmaking!
Refering to halo 3 and halo reach their is a custom forge game mode, here you can build and shape your very own map creations for both custom and recreational use.
Your disc may be scratched, you can fix that by borrowing the game from a friend and install the game (from the game library tab) and then return it and it should work.
right now the newest halo game is "halo reach" I got it today. You should get it
To play local on halo reach, start at the title screen when you start up the game. Hit main menu, then custom games. That is local gaming. (Meaning people on your xbox, not system link. For system link I don't know how.)