Originally created for Quake, Tyrann's classic Aggressor has been ported to numerous games -- a testament to its gameplay and build quality. The author describes the level:
"Brutal vertical action is the order of the day here. A medium sized base map that plays well with anywhere from 2-8 players, the more the bloodier."
Aggressor is an excellent level for one-versus-one games, and does just fine with small free-for-all groups too.
Type map aggressor at the console to play this map.