- Unseen Blade
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- Intrepid Heroic Member
Yes, you will play others on Halo 3 from ODST and vice versa, as well as people on the same disc.
Example:
I'm playing Halo 3: ODST.
My friend is playing Halo 3
My other friend is playing ODST with me in Firefight.
I can go back to the lobby, invite my friend, and switch the game mode to matchmaking and play with him. I just won't be able to play ODST exclusive features like the maps, campaign, or Firefight mode.
[Edited on 06.02.2009 12:50 PM PDT]