Halo 3 online question...?

[Karma]

Can people playing halo 3 odst online play with ppl with just halo 3? map are same so i dunno?..
i am indeed

 

[Icamaiga]

Yea you can but how do you get the last 3 skulls for halo 3??? I have ODST and Halo 3 but I can't seem to find the maps themselves!!! It's so frustrating!!!

 

[Chucknorrisll7]

Yea but it depends which maps though and are you the Pro Karma???