The campaign
1)download a UI.map and insert into the folder maps
Singleplayer
1)add -console to destination of haloce connection
2)press in game "\" and write map_name namemap for example my map is dead_halls so i write map_name dead_halls and i press enter
a example of a singleplayer map is this:
download:
http://www.mediafire.com/?02rr5q35ab67w00bye