The WORST officially released Doom map, hands down. And the tragedy is this map doesn't even have to be this awful... if the Mancubi weren't high in the Baphomet brains and the central arena wasn't designed to be so AIDS-inducing, this map would honestly be pretty fun.

Anyway, 76/77 (98%) kills is conventionally accepted as max kills on Source due to a Spectre near Romero's head being placed inside a wall and, as such, immune to splash damage. However, by positioning yourself on the skinny ledge as seen on the end of the map, it is possible to direct-hit this Spectre with rockets, killing it and netting 77/77 (100%) kills. Since this isn't too difficult, I decided I'd get 100% kills, and I genuinely think 100% kills should be required.