Uh, sorry to tell you, but that's illegal. To play halo Custom Edition you must have the original Halo and a product key (genuine)
Either their is something wrong with your internat or your halo custom edition is stuffed because it does let you play maybe you need to reinstall halo custom edition.
From what I heard, yes.
MAPS
i is quite hard.i used the disk once and then it worked without the disk.you could borrow or hire a halo disk.but i think you may be able to download somthing off the internet to replace the disk.
Yes, in a way. Halo Custom Edition has most of the features that Halo Combat Evolved has, except the custom edition is made only for online-play, and in the multiplayer setting, people can design their own maps with certain programs and play in the user-created maps with the whole Halo community.
You install it then play it from the shortcut.
I don't think that Halo 3: Legendary Edition is a game.
you cant unless you have mods
no
There is no way to get it without the Halo 3: ODST Campaign disk.
Not without hacking, no.
Yes, you can play firefight in Halo 3 ODST without Xbox live.