It’s simple:
A set of dominoes has 28 tiles. We take those 28 tiles, and we assign each a pair of rooms. Arrange the tiles as you like. (I don’t know how to play dominoes. Fuck it.) This gives you 56 rooms, including special hallways (the blank tiles).
I used the d6 drop table procedure from Cairn 2e for this, but ended up modifying the order slightly. (0 Hallway; 1 Special; 2-3 Lore; 4-5 Trap; 6 Monster.) So, you can use the d20 tables in that to generate what’s actually in the rooms. Or, modify that original d6 list and tailor the distribution to your heart’s content. (Honestly, “Treasure” should be an option here, but I already made the table.)
This table is formatted so you can write up what’s in your rooms on the right.
Would love to hear ideas about how to make this better. Hit me up on bsky or tag me on Discord; I’m in all the cool OSR servers (@onslaughtsix).
