Valve as we all know, has released a new "Floating Camera" type game. This game is powered by the Source Engine and since its Source its uses Hammer. So I read up on it and found out that mapping in this game is quite a bit different.
Take a look:
http://developer.valvesoftware.com/wiki/Swarm_Mapping_basics
Take a look:
http://developer.valvesoftware.com/wiki/Swarm_Mapping_basics