you do apparently have an illegal version of Halo. get the legal version of halo to play the campaign.
In my opinion, Halo 3, because the storyline is better (partially because it continuing the story from 1 and 2). Halo Reach's campaign is still good, but should've been a bit longer. Anyway, don't let me decide for you, make your own decision :)
You get the Halo 3 ODST campaign and Halo 3 multiplayer. Nothing else.
Yes, you can mod campaign mod on the Halo trial.
no halo "campaign" is a single player game
get a new halo 3 disc
Finish the Halo 2 single player campaign.
i own it and halo reach is way shorter (but harder) then halo 3.
Be player 2 in the halo 3 co-op campaign. Or, play the Arbiter levels in halo 2.
There is no way to get it without the Halo 3: ODST Campaign disk.
Yes
there might be now because there is a new campaign on halo 3