Up to two players can play in the Co-Op Campaign mode on Halo: Combat Evolved.
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Over XBOX Live, there can be at the most four people playing one campaign session. On a single XBOX 360, only two people can play at the maximum.
you do apparently have an illegal version of Halo. get the legal version of halo to play the campaign.
Actually, Halo Reach will allow 4 players to play through the campaign, split screen or through Xbox Live. It's perfectly possible to play with only two or three players as well. As a side note, you can play split screen with your buddy and play with two others on Xbox Live, provided both of you have a Gold Membership.
You put in your Halo 3:ODST campaign disk and go to play the BETA and download it.
No set grade, play whenever.