Often abreviated OO][. You are a frontiersman / frontierswoman in a post-nuclear holocaust world-on-the-brink. Very original design, especially the first use of the concept of both short- and long-range weapons, and the unusual "linear" attack interface. Lands of Devistations just doesn't do it for me the way OO][ did.
It was a very Nethack/Moria type deal with a text-based overhead view of the "wasteland". You wandered, from your base to other bases trying to blow the living hell out of other players, NPCs and what have you.
Funny, I don't recall that there was ever an Operation: Overkill part 1.