I used this adventure in my HackMaster 4th campaign and the truth is that it has very good. Interesting challenges and good treasure for a group of 7 players.

Mark Taormino is like some sort of mad genius. I love his Maximum Mayhem Dungeons and each one "delivers the goods" in terms of hitting that nostalgia feel. What if the Keep on the Borderlands was destroyed and then humans came in and built a new keep on top of the ruins. Let's also say the caves of Chaos have been cleared, but not all the monsters were killed. Where did they go? What did they do? Now invite the Slave Lords from the A series over. You would get Villains of the Undercity! This adventure is an ode and homage to the great dungeon crawls of the day. While this adventure fits the gonzo style of the other Maximum Mayhem Dungeons this one can also be played straight. Well...sorta. There is a crazy Halfling Illusionist Assassin, but that is for the players to figure out. With this one anyone that has ever been inside a classic dungeon will find something to love. There are lots of deadly traps, monsters and puzzles to figure out. Of course plenty of treasure too. This adventure is also the one that I can see fitting into a larger campaign, even with adventures from other publishers. I was mentally placing it in Greyhawk or even Dolmvay. Just really a lot of fun.