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How to Generate a Dungeon Map Worth Playing
Manesh Jayawardhana
CIO & Co-founder
A generated dungeon gives you thirty rooms in two seconds. Then you run it and the session drags, because the layout is a branching tree — every corridor is a dead end that has to be walked back down, and players spend more time retracing than exploring.
The geometry a generator produces isn’t neutral. Some layouts play well and some don’t, and the difference is a small number of structural properties.
What makes a layout play well
Loops. A dungeon where corridors reconnect lets players circle round, approach a room from two directions, and retreat without walking back through everything they’ve cleared. A pure tree forces backtracking, which is the single most common complaint about generated dungeons. This observation is central to Jaquaying the dungeon — the idea that non-linear, interconnected layouts produce far better play than branching ones.
Choices at junctions. A three-way junction where all three paths are unknown is a decision. A corridor with one door is a corridor.
Vertical connections. Stairs, shafts and balconies connect areas that aren’t adjacent on the map, which makes the space feel like a place rather than a diagram.
A reason for the shape. Rooms arranged because someone built them for a purpose read completely differently from rooms arranged because an algorithm placed them.
Size it for the session
Eight to twelve rooms is roughly one evening of play for most groups, fewer if rooms are set pieces with substantial encounters.
Generating thirty rooms produces twenty that get skipped, or a dungeon that spans four sessions and loses momentum. It’s tempting because more feels like better value; in play it isn’t.
| Rooms | Play Time | Best For |
|---|---|---|
| 5–8 | Half a session | A focused site, one objective |
| 8–12 | One session | The standard useful size |
| 20+ | Multiple sessions | A campaign location, revisited |
What the generator can’t do
Geometry is the easy half. What makes a dungeon memorable is the fiction: who built it, what it was for, why it’s abandoned, and what’s changed since.
That’s not decoration. It determines the answers to every question players ask. Why is this door reinforced? Why is there a kitchen next to a shrine? Why does the corridor stop? A layout with an explanation answers those consistently; a layout without one makes you improvise, and improvised answers contradict each other by the third room.
Take the generated map as a floor plan and spend ten minutes deciding what the building was. The rooms will suggest most of it.
Common mistakes to avoid
- Using a generated tree layout without adding at least one loop.
- Generating far more rooms than the session can use.
- Placing the entrance at the far end from everything interesting.
- Treating the room numbers as a running order — players won’t visit them in sequence.
- Leaving the map unexplained, then improvising contradictory reasons for its features.
How to do it with Dungeon Map Generator
The Dungeon Map Generator produces layouts with loops and connections rather than pure branching trees.
- Pick a size that matches your session length — eleven rooms is about one evening.
- Choose a style: caverns for organic shapes, constructed layouts for straight walls and consistent doors.
- Check for loops. If the layout is a tree, connect two dead ends.
- Spend ten minutes deciding what the place was built for, then let the rooms follow from that.
Other tabletop tools are in the tools directory.
Frequently asked questions
What makes a dungeon layout good to play?
Loops and choices. A branching tree forces players back down corridors they’ve already cleared; a loop lets them circle round and keeps the pressure on.
How many rooms fit in one session?
Eight to twelve for a typical evening, fewer if rooms are set pieces. Generating thirty usually produces twenty that get skipped.
Should I use the map exactly as generated?
Use it as a skeleton. A generator gives you geometry; the reason each room exists is what turns it into a place, and that part is yours.
Final thought
Check for loops before you run it, and know what the building was for. Those two things separate a dungeon that plays well from a grid of rooms with monsters in them.