The original working title of this post was "Mega, my ass!" But that was way too confrontational for the vibe I like to maintain around here. Like my previous post on 3-D dungeon design, I'm not trying to call anyone out here. God forbid Joe or Mike do anything different on my account. And those of you who have mastered the art of painting dungeons on grains of rice don't owe me a damn thing. I just want to offer an alternative. And that alternative goes something like "Holy friggin' crap! How big did the DM make this level?!"
How big can we make a dungeon and get away with it? I think the answer is a lot bigger than we usually work with. Upping the scale of the dungeon map obviously costs in the ability to graph fine detail, so just deciding that one square equals 30' isn't going to get the job done. Here are a couple ways you can make the dungeon bigger:
Here's a page from First Fantasy Campaign, Arneson's not-completely-successful attempt to organize his campaign notes for public consumption. The level 4 Castle Blackmoor map (at 10' per square) nestles into this larger scale (30'/square) map of the tunnels in and around the castle. The cool thing is that I'm not sure the players have any way of knowing when they've left the dungeon proper. Here's an easy peasy example of how you can use this at home:
Levels 1a through 1e and 2a are all basically one whole page in size, at 10' square. Level 1x is a "crossroads", which you could flesh out as a mini level. One or two dungeon geomorphs would probably be all you need for 1x.
Whole dungeons can easily fit into one hex when your scale is one mile each! Obviously the dungeon becomes an even bigger logistical challenge if you're going to underground for weeks or months. Wise players might want to adopt a protocol like "If we go 1000' with no change in a corridor, we immediately turn around. Exploring that passage can wait for a dedicated expedition."
Another nifty example of a vast underground wilderness (almost Journey to the Center of the Earth in scope) is the Underworld of the computer game Ultima V. I wasn't fond of U5. It seemed like a step down from the pinnacle achieved in its immediate predecessor. But the first time my rowboat went over a waterfall and ended up in the renfair fantasy equivalent of the Land of the Lost? Priceless. To this day I still fear mongbats.
Finally here's a cheap trick for making your dungeon more spacious:
The main difficulty here is that in the middle of a run you might forget that room 10 and room 7 aren't really 30 feet away from each other. That can be very important to remember for teleport, locate object, rings of x-ray vision, etc. For low level dungeons it's not as critical. My own copy of Keep on the Borderlands is marked up to add about 300' between many of the caves.
"Man, is there anything Jeff CAN'T do when it comes to gaming? This guy is like a critical 20 every roll. Jeff can bite the heads offa five game geeks, including their sorry-ass DM, and spit 'em into a large duffel bag ONE AT A TIME!...that's just the kind of messed up bastard he is! You think yer a gamer, punk? Well..do ya? Jeff will depants your weasel-ass right in front of your grandma."