There are now 21 maps on Xbox Live :

* Lockout
* Ascension
* Midship
* Ivory Tower
* Beaver Creek
* Burial Mounds
* Colossus
* Zanzibar
* Coagulation
* Headlong
* Waterworks
* Foundation
* Containment
* Warlock
* Sanctuary
* Turf
* Backwash
* Elongation
* Gemini
* Relic
* Terminal

Can I select my favorite level under optimatch? -When I select a map, to
host my own game, I can only invite friends or clan members. I can't set up
a normal open game.

If I would like to play on a specific map, on the list, in an open game,
what should I do?

PC
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GT: Tom Atmo