Two maps, one entered into the Bungie map competition, a level from a scenario to be released later (at this point, presumed deceased). Hit the switch, wait for the door to open, kill stuff, find another switch, wait for the door to open... and so on. And so on. And so on. Until you finally say "that's enough, thanks" and quit. (The author could use a bit more humbleness in his readme, given the quality of the map.) The other map is a rather convoluted netmap. (He's not kidding when he says "I'm not on the net, so I don't know s*** about net-levels".)