Choose the gamemode Slayer (Not Classic Slayer) and play that one, or choose invasion, to play Spartans against elites, or choose infection, for Spartans and elites to fight infected Spartans and elites. there may be other ways, but they are not yet known.
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Call it Elite Elimination. You can set all of the enemy's to be Elite's. Plus, you can get A decent amount of credits. The other options are up to you.
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!
In any Pokemon game, you must defeat the elite four and the champion.
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.
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.