You don't have the Halo 2 Multiplayer Map Pack. You need that to download new maps onto your XBOX's memory. I don't know how much it costs, and I don't know what stores sell it now. It doesn't only give you foundation, though, but it also gives you a whole bunch of other maps. I got it and loved it.
Halo2-halo2-halo2-halo2-halo2
yes
You have to buy the multiplayer map pack for black ops to unlock the zombies map ascension
The map, Foundation, does not exist in Halo 3 and is only available in Halo 2.
to unlock the map so you can look at it
No.
the only map you can unlock is the captain falcon map by playing at least 50 times
get an A ranking on each merc map, if you get a B you unlock the next map
Buying the Map packs will also unlock one of the Nazi zombie maps. For example, the map pack 2 will unlock the map Shi no numa.
You can't unlock items, you have to download map packs off of Xbox Live. Like the Heroic map pack, the Legendary map pack and the Mythic map pack.
"DOA" unlock Dead Ops. "ZORK" Unlocks an achievement. "3ARC UNLOCK" unlocks a Zombie map
You cant