How do I play lone wolves on Halo 3?

[Sam N]

When I try to start a ranked match, it says not all players have these map packs.

 

[aslan]

Are you playing with someone else on one xbox? Guests can't play ranked matches. If not, then you probably don't have the maps. Go to Halo 3 on xbox live and download all the free maps. You need all the free maps to play there.

 

[Sparton117]

u need to buy maps on the marketplace its the the legendary pack