Up to two players can play in the Co-Op Campaign mode on Halo: Combat Evolved.
You and a friend IRL or over XBOX Live work through the Halo : Reach campaign missions
You can play 4 player co-op on Halo 3, but not all on the same Xbox. To play 4 player co-op on Halo 3 you can either have 4 people all on different xbox's and use xbox live, or have 2 people on each Xbox and either use Xbox live, or System link to join the parties together.
On the Xbox version you can play up to four players in split screen or 16 with system link. Only multi player mode, there is no cooperative play. There is also no online play for the Xbox version. The P.C. version does however support online play.
you don't
Be player 2 in the halo 3 co-op campaign. Or, play the Arbiter levels in halo 2.
yes it can
You can have more you can have up to 4
Reyyy probably mate ruuuuuuuuuuuu imagine if it was one player hu hu hu x
yes
yes u go to play multiplayer and then u go to co op then u press a then u play the lvl u want to
Probably not ONLY covenant, but Halo 2 already has about half of its levels where you play in the life of the Arbiter, one of the Elites shamed after losing the first Halo ring. Both Halo 2 and Halo 3 allow you to play as an Elite in Multiplayer, and Halo 3's co-op allows you to play as the Arbiter for the second player. I hope this answered your question.