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For Source-based games (Counter Strike: Source, Team Fortress 2, Left For Dead), how do I change the map rotation on my own server?
You'll want to go into the cstrike or tf folder and create/edit the mapcycle.txt file.
Simply make a list of maps separated by newlines.
Note: You can't have L4D have a mapcycle because the campaign is decided by the people that will play on your server.