What are the different online game modes in Halo 3 Odst?

[Anthony]

Iv'e already heard of firefight mode, but is that it or is there slayer, Capture the Flag etc.?

 

[Pzunnie]

yes all the same general modes halo 3 had but either made better + nicer graphics

 

[moribalken93]

Halo 3 ODST comes with a seperate disk containing Halo 3 Multiplayer. This disk has all DLC associated with Halo 3 (Legendary and Mythic Map packs) plus 3 new, bonus maps. Firefight mode is not online if I recall correctly.