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CASTLE OLDSKULL - The Classic Dungeon Design Guide IV


The Ultimate Compendiums for Mega-Dungeon Design.

Book Four in the Mithral Medal Bestselling Series.


Continuing in the Underworld delving spirit of the Mithral Medal Bestseller, The Classic Dungeon Design Guide as well as The Oldskull Dungeon Generator, author and RPG designer Kent David Kelly is proud to introduce The Classic Dungeon Design Guide IV for all your netherworld creation needs.

This book embodies and unifies the lessons from the original trilogy of Classic Dungeon Design Guide tomes (I-III), empowering you to create the sprawling first level of any mega-dungeon, in order to challenge adventurers of experience levels 1 to 3. The threat levels of the monsters, traps, tricks, and treasures within this volume all reflect that difficulty level.

You can use this book to design any number of unique dungeons, and if your group is patient you can even use the Fast Play Guides during play. You will also find some simple solitaire rules here, and advice for solitaire Game Mastery, if you want to practice the dungeon crawling by yourself!

The dungeon design master system in this volume is comprised of powerful branching D100 and D1000 tables. Sub-systems are provided to generate: [1] dungeon level starting areas, [2] random doorways, [3] corridors, [4] dead ends, [5] level connectors (stairs etc.), [6] unusual ascents and descents (teleporters, slides, etc.), [7] monster lairs, [8] monster-guarded treasures, [9] room sizes and dimensions, [10] room exits and locations, [11] unusual doors or apertures, [12] room content themes (lair, trap, trick, etc.), [13] side passages, [14] traps, [15] tricks, and [16] unguarded treasure hoards. A full treasure generation system for character levels 1 to 3 is provided as well.

Tiers of flexible complexity are built into every system, attending to various readers’ needs. You can use this book to create a solitaire environment for inspiration or storytelling, or to begin a mega-dungeon campaign for your favorite Moldvay-compatible Basic and Expert game. Through abstraction, you can use this book to create a subterranean environment for any game or system edition that you like.

So what are you waiting for? The tools to create an infinite number of dungeons for your swords and sorcery adventures are ready for you to wield.

Another fine creation from Kent David Kelly and Wonderland Imprints, Only the Finest Works of Fantasy. (92,000 words, 294 pages.)

To view the entire library of available titles for Castle Oldskull, Hawk & Moor, Old School Essentials compatible supplements, and more, please visit Kent David Kelly's Wonderland Imprints publisher page.

File Size: Please note that the file is about 81 MB in size, so if you have a slower computer or limited connection, you might have download difficulties. There are four files in this product, consisting of the full book (81 MB) and a duplicate version that is split into three pieces (<40 MB each) for those with limitations. You only need the full book single file version if you can download it effectively; the three-piece version has the same exact material.

Disclaimer: This product contains assets that were procedurally generated with the aid of creative software powered by machine learning.


Full Color Softcover and Hardcover Print Edition

This book is also now available in a full-color 8.5”x11” print edition, in both paperback and hardcover formats, at the author's Amazon page.


The Wonderland Imprints Swords & Sorcery Library


Supplement Title

Primary Game Topics


The Classic Dungeon Design Guide I

Dungeons / Lore / Random Tables


The Classic Dungeon Design Guide II

Dungeons / Lore / Random Tables


The Classic Dungeon Design Guide III

Dungeons / Lore / Random Tables


Oldskull Dungeon Generator

Dungeons / Solo Gaming Tools


The Book of Dungeon Traps

Dungeons / Random Tables


Oldskull Dungeon Tools

Generators / Solo Gaming Tools


Game World Generator – Deluxe Edition

Game World / Random Tables


Oldskull Adventure Generator

Game World / Random Tables


Chaotic Descriptor Table

Generators / Random Tables


Dungeon Delver Enhancer

Characters / Lore / Random Tables


Oldskull Warriors

Characters / Classes / Lore


Oldskull Knights

Characters / Classes / Lore


Oldskull Anti-Paladins

Characters / Classes / Lore


Oldskull Plague Doctors

Characters / Classes / Lore


Oldskull Gonneslingers

Characters / Classes / Lore



Characters / Races


Oldskull Half-Ogres

Characters / Races


Oldskull D100 NPC Generator

Characters / Generators


Character Tables

Gameplay / Tabletop Reference


Combat Tables

Gameplay / Tabletop Reference


Dungeon Monsters & Treasures Level 1

Monsters / Treasure


Oldskull Dungeon Encounters

Lore / Monsters / Treasure


Oldskull Dungeon Bestiary

Monsters / Random Tables


Oldskull Dragons

Monsters / Treasure


Oldskull Trolls

Lore / Monsters / Races


Oldskull Monster Generator

Generators / Lore / Monsters


Oldskull Treasure Trove

Random Tables / Treasure


The Oldskull Deck of Strangest Things

Lore / Random Tables / Treasure


City State Encounters

Random Tables / Urban Adventures


The Order of the Scarlet Tabard

Characters / Lore / Random Tables


Captains of the Scarlet Tabard

Characters / Lore


Oldskull Tyrrhenia Map Pack

Game World / Lore / Realm Maps


333 Realms of Entropy

Game World / Lore / Monsters


1,000 Rooms of Chaos

Dungeons / Solo Gaming Tools


1,000 Rooms of Chaos II

Dungeons / Solo Gaming Tools


The Pegana Mythos

Characters / Game World / Lore


The Oldskull Necronomicon

Characters / Game World / Lore


Lords of Oldskull: Krampus

Classes / Lore / Monsters


Character Creation

Basic / Expert (B/X) Characters


1977 Bestiary

Basic / Expert (B/X) Monsters


Adventurer’s Arsenal

Basic / Expert (B/X) Equipment


Turn Tracker

Basic / Expert (B/X) Gameplay


Oldskull Grid War

Basic / Expert (B/X) Gameplay


Hawk & Moor Book I

TSR / Gary Gygax History 1973


Hawk & Moor Book II

TSR / Gary Gygax History 1974


Hawk & Moor Book III

TSR / Gary Gygax History 1975


Hawk & Moor Book IV

TSR / Gary Gygax History 1976


Hawk & Moor Book V

TSR / Gary Gygax History 1977


The Steam Tunnel Incident

TSR History / 1980s


(And more can be found at the Wonderland Imprints publisher page.)

Don't know where to begin?

Each of the Wonderland Imprints series has an acclaimed first introductory volume. You can start there, and then journey further as you choose.

Series include the Black Label Editions (unillustrated tabletop volumes), Castle Oldskull (old school RPG supplements), The Classic Dungeon Design Guides (system neutral dungeon crafting), Hawk & Moor (Dungeons & Dragons history), Old School Essentials (supplements for Gavin Norman's B/X game), Oldskull Innovations (unique experimental products), and the Oldskull Library (classic weird fiction), as well as many Free Supplement Releases.

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Discussions (2)
Customer avatar
Chad B June 05, 2023 9:46 pm UTC
What sets this book apart from CO1-CO4?
Customer avatar
Kent K June 05, 2023 10:09 pm UTC
Hi, while the first three guides are focused on abstract idea generation, this one (by request) is more driven toward direct concrete application. So it deals with the lengths of corridors, map construction, specific monsters and treasures in a room, the exact play nature of traps, monster behaviors, an over-arching dungeon background theme, and so forth. It takes the first trilogy and some of my other books (traps, dungeon generator, Scarlet Tabard, etc.) and turns them into a cohesive room-by-room construction system for GMs who want full guidance on how to use the tools to create playable results.
Customer avatar
Peter L June 05, 2023 7:45 pm UTC
FYI, my computer found your file too big to download. Thank you.
Customer avatar
Kent K June 05, 2023 10:11 pm UTC
Hi Peter, sorry to hear that. Thanks for the report. I'll try splitting the file into two pieces, but that will affect its game tool functionality a bit, so the pieces will be in addition to the full version since I don't have any other reports of file difficulty as of yet.
Customer avatar
Peter L June 06, 2023 12:34 am UTC
Thank you very much for doing this. The first file downloaded fine, but for the second one, I received the same message: "File Too Large."
Customer avatar
Kent K June 06, 2023 1:40 am UTC
Hi, sure thing. I split part 2 into two parts, so now it's in 3 sections. You might want to ask for a refund though - not sure how useful the book will be in segmented form.
Customer avatar
Peter L June 06, 2023 2:01 am UTC
Thanks again!
Customer avatar
Juho P June 06, 2023 7:35 am UTC
You could try a plaintext version too. It's hard to say anything definitive from this end, but I'd hazard a guess that the new visual direction is swelling up the file sizes. I've been finding it pretty distracting and off-putting, anyway - even actively pushing me away from several of your products I'd have bought in an eyeblink otherwise. You're clearly excited by the possibilities of the new technology and how easy it is to fill the pages with stuff, but I liked how the old artwork would inspire me a little bit and then stay politely out of the way while I try to read.

I'll probably buy this one in the end anyway: I've been looking forward to it almost as much as the continuation of the Mythic World class line. I hope you're still working on those too. bards pls
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File Size:
170.62 MB
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File Last Updated:
June 05, 2023
This title was added to our catalog on June 04, 2023.