

This is something that's been asked for before, and while it's a very good idea, Twinreaper has suggested that it's something that probably couldn't be done within the Halo engine.
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the same type of AI players you can fight in Black Ops or Gears of War or Star Wars Battlefront, right? I think what you're asking for here are 'bots', i.e. I'm not talking about firefight this should be with AI Spartans from the campaign you should be aloud to have the same maps competitive Multiplayer would have. You would be able to change the difficulty like campaign for Noobs or even the most experienced players who want a challenge and practice there skills.
