Got custom maps working in multiplayer with the ingame editor.
First make a map in the ingame editor, with a start and exit. Setup some objectives.
Now close the client.
Look under X:\Steam\SteamApps\common\alien swarm\swarm\maps
You'll see some files called Output with some extensions.
Feel free to rename all those to something else thats not Output so you don't overwrite your masterpiece later. (Editor only saves maps as Output)
Now start up an online game.
Then open the console and type map Whatever
The map should load, have friends join you and enjoy the pain you are about to beset unto them.
Note: Everyone needs the SDK installed for this to work.
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