There are no CPU players for multiplayer in Halo Reach.
Yes
No :(
go to Marketplace, Game add ons, map packs, browse 'halo'
by getting xbox live
Yes, the NDSi and NDS can connect to play DS games
you cant
Yes, there is i played it with my Brother tons of times.
its not a mutiplayer on the ds game ,people !
all multiplayer is free...it only isn't when ur talking about live...
you can't make a firefight map using forge, only mutiplayer
Halo multiplayer is when you play Halo against a human opponent. There are several modes, including but not limited to Capture the Flag, King of the Hill, and Slayer. There are also various changes you can make to the gametypes.