Once you have completed your map, compiled it, etc, you go to the multiplayer start server... you don't see your map anywhere in site?

You need an arena file.


Go to your /main folder and create a folder called mp

Go into notepad and copy and paste..(this is an example only.)

{
	map		"mp_sdtest"
	longname	"Search and Destroy Test Map"
	gametype	"dm tdm sd"
}

Where it says map put YOURMAPFILENAME. Example: Your map is named mp_testmap in the editor. Put that name.

Under longname, put what your map would be called. A more realistic name. Example: Normandy, France

under gametype list all the gametypes your map is mapped for(must have all the spawns etc in map. if it doesnt have tdm then do not add tdm to the gametype) DO NOT ADD COMMAS TO LIST!

Gametypes allowed: dm tdm sd hq ctf

Save your file as yourmapfilename.arena in the mp folder!

Now your map will appear in the start server config!

Screenshot:
http://img178.imageshack.us/img178/1632/untitled3dm.jpg

-Courtesty of VIP

Enjoy!

added to the tutorials section

thanks!