Every dungeon should have a maze level. Imagine one where you dump the players in unaware that their characters have been killed (or possibly merely had their bodies paralysed while their minds are transported to his new level). So they can't interact with any inanimate physical objects, and when they eventually find other living things, the encountered creatures flee from them in fright.

For bonus fun, use this actual map, and see how long until they figure it out.

In the real world of the Pac-Mans & Power Pellets universe, of course, Pac-Man doesn't exist. That's the premise of this entire comic, after all. But most of the other things we know and love (such as ghost-filled mazes) do, albeit modified by the lack of Pac-Man:

• Powerballs is a serious documentary about lotteries around the world.
• Bill Pac-ston is known (barely) for doing voiceovers for poorly selling computer games, but gains widespread fame after his appearance in the first Futurama movie.
• Toru Iwatani is known primarily for his role as designer of Cutie Q.
• Nerdy guys make YouTube videos of themselves engaging in cooking contests instead of running down corridors dodging ghosts.
• Without the success of Pac-Man to spark interest in video games, Pokémon was never revisited with numerous TV shows and movies, and remains an obscure Game Boy cartridge game.
• Super Mario Brothers was never made into a movie. Fans of Nintendo never had it so good.
• The maze exploration background that pervades all of Western culture is Mazes and Monsters, despite it never being much good. The original was adapted recently into a new, updated tabletop roleplaying game with a bigger budget, high-tech computerised graphics, and edgy writing. And it sucked.
• Throughout the 1980s, all the greatest youth pastimes were making extra money by delivering newspapers and doing odd jobs for people.
• The Comic Irregulars exist and are making a screencap comic based on It's a Mad, Mad, Mad, Mad World.

Transcript

Blinky: Okay guys, looks like the coast is clear. Let's go.
Blinky: Hmmm. Lots of corridors and intersections.
Pinky: Oh, great. A maze level. There's gonna be a minotaur, I know it.
Pinky: What are all these dots on the floor? Why can't we pick them up?
Clyde: Uh... the door closed behind us! We're trapped!.
Inky: I think I see a way out here.
Pinky: Wait, did we die in that trap on the last level and not realise it? Are we incorporeal? Are we ghosts??
Clyde: Stop freaking me out, and don't split the party!
SFX: waka waka waka waka...
Clyde: What's that?!
Pinky: Doesn't sound like a minotaur...
Inky: Ah, crap. It's a teleport. We're gonna need more graph paper!