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After comparing dungeon stocking in B/X D&D and Labyrinth Lord, I went hunting for a detailed list of differences between the two games. I couldn’t find one (still looking!), but I did come across a post about stuck dungeon doors by Peregrin on noting that there might be a difference there. There is one, and it’s fascinating.

Why do stuck dungeon doors matter? It sounds like such a little thing, but it’s surprisingly significant. The nature of dungeon doors plays a big role in defining the character of the dungeon.

To get there, we first have to walk back the cat a little bit — specifically, all the way back to OD&D.

OD&D dungeon doors

Here’s what Book III says about doors:

Generally, doors will not open by turning the handle or by a push. Doors must be forced open by strength, a roll of a 1 or 2 indicating the door opens, although smaller and lighter characters may be required to roll a 1 to open doors. There can be up to three characters attempting to force open a door, but this will disallow them rapid reaction to anything awaiting them on the other side. Most doors will automatically close, despite the difficulty in opening them. Doors will automatically open for monsters, unless they are held shut against them by characters.

There are three cool things in that excerpt:

  1. Most dungeon doors are stuck
  2. PCs have to force them open, but monsters don’t
  3. Most doors automatically close behind the PCs

My favorite interpretation of why that might be comes from D&D blogger Philotomy, whose site has vanished from the web. Fortunately, “Philotomy’s Musings” have been preserved (in several formats). Hit that link and scroll down to “The Dungeon as a Mythic Underworld,” and you’ll find this theory:

Similarly, characters must force their way through doors and have difficulty keeping them open; however, these same doors automatically open for monsters. This is a clear example of how the normal rules do not apply to the underworld, and how the underworld, itself, works against the characters exploring it.

I love that! The dungeon itself is working against intruders. It’s a fun theory on its face, it explains a lot, and it highlights something compelling and quirky about OD&D.

Even if you don’t buy the “mythic underworld” concept, though, dungeons in OD&D do work differently for monsters than they do for PCs. With that in mind, let’s peek at the B/X D&D Basic Set.

B/X D&D dungeon doors

Here’s the B/X version:

Doors in a dungeon are usually closed, and are often stuck or locked. A lock must usually be picked by a thief. An unlocked door must be forced open to pass through it. To force open a door, roll Id6; a result of 1 or 2 (on Id6) means that the door is forced open. The roll should be adjusted by a character’s Strength score adjustment. The number needed to open a door can never be less than 1 nor greater than 1-5.

Once a door is opened, it will usually swing shut when released unless it is spiked or wedged open. Doors will usually open automatically for monsters, unless the door is held, spiked, or closed with magical spells.

The mechanics are a bit different, but it’s not the mechanics I’m interested in — it’s the “active dungeon” element. Most doors are stuck (or locked), stuck doors aren’t stuck for monsters, and they close automatically behind PCs. Like dungeons in OD&D, dungeons in B/X work against the PCs.

Ready for LL’s take?

Labyrinth Lord dungeon doors

Labyrinth Lord on dungeon doors:

Labyrinths often have many doors, some secret and others obvious. Many are locked, and a thief will need to attempt to pick locks. However, characters can attempt to break a door down. In this case, the player rolls 1d6. A result of 2 or less means the door has been broken down. Strength adjustments apply, but no matter what the adjustment there must always be a chance of success or failure. Bonuses cannot take the success range above 5 or below 1 on 1d6. For example, if a character has a STR of 15 he receives a +1 to open doors. He would instead need to roll 3 or less on 1d6 to succeed. A character with STR 5 has -2 to open doors, but since the odds cannot go below 1, if the player rolls a 1 on 1d6, he succeeds in breaking down the door.

Setting side the die rolls, which aren’t my focus, that’s quite different!

Stuck doors aren’t mentioned at all, and locked doors can only be broken down (rather than forced open). Also absent are doors that close automatically behind PCs, but not monsters — doors are just doors, and they work the same way for everyone.


Many small differences between B/X and Labyrinth Lord can be chalked up to maintaining a certain amount of “legal distance” from D&D, or to limitations based on what’s available in the SRD, or both. I’m not sure if this difference falls into that category, but I thought that looking at Swords & Wizardry (which emulates OD&D) might help.

S&W notes that “Stuck doors (and many doors in an ancient dungeon may be stuck closed) require a die roll on a d6 to force open.” That’s part of what OD&D says about stuck doors, but not all of it. It seems odd to me that the rest of OD&D’s rules for stuck doors would be off-limits legally, but I guess it’s not out of the question.

But whatever the reason, Labyrinth Lord dungeons don’t work against the PCs in the same way that B/X (and OD&D) dungeons do. A by-the-book Labyrinth Lord dungeon will have a different character than a B/X or OD&D dungeon, and it will play by the same rules for monsters and PCs.

The differences between B/X and LL dungeon stocking were pretty minor, the most notable being a slightly upped chance of a room being special/unique in LL. That gives LL dungeons a subtly different flavor than their B/X counterparts. The dungeon door difference feels more significant, and it surprised me.

Whether that’s a good, bad, or neutral thing comes down to personal preference, of course — and if you like the B/X approach, it’s just a house rule away.

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