You and a friend IRL or over XBOX Live work through the Halo : Reach campaign missions
Actually, you can play with up to 4 players co-op.
I don't think there is. You can only play campaign and the player vs. player modes.
no halo "campaign" is a single player game
Kinda, you get Halo Reach, but you are limited to playing the Anniversary Map Pack. All game modes are on except Campaign and you only play Maps from the Add On.
When in the campaign menu press Y to change your network settings to local Xbox instead of Xbox Live.
Be player 2 in the halo 3 co-op campaign. Or, play the Arbiter levels in halo 2.
you do apparently have an illegal version of Halo. get the legal version of halo to play the campaign.
you can if you play coop campaign mode. The second player will be the arbiter
Another Spartan
What do you mean "How do you play solo campaign on Halo 3?" Just go to the Main Menu and select campaign and start Solo Campaign.
If I understand you correctly, you want to play the entire Halo: Combat Evolved campaign on a trial version of the game. That is impossible. The trial version of Halo: CE was "packaged" with only the single-player mission "The Silent Cartographer", and the multi-player map "Blood Gulch". If you wish to play the entire campaign, you must purchase the full game at a store like Best Buy, Target, or online.
Up to two players can play in the Co-Op Campaign mode on Halo: Combat Evolved.
The second player will also play as Master Chief in a co-op game.