Scavenger Hunts! I love Scavenger Hunts. And riddle dungeons, somewhat like Quarn but more setup like the treasure dungeons.
Can you imagine playing that one "that door is lying but I'm telling the truth" famous riddle in a dungeon to progress or get kicked out? That would be awesome!

OOOH or Escape Room Dungeons. Ones you have to figure things out to escape, or fail when the time runs out. =D