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CASTLE OLDSKULL - Oldskull Grid War


Can the valorous fighters and dwarves protect the party’s spell casters from twenty onrushing orcs?

Can the heroes outflank and Charge to strike at the orc chieftain?

Can the party actually battle in formation before they’re completely surrounded?

How many men-at-arms can move through a doorway into melee in a single round?

How many dragon slayers can really attack the dragon?

What is the range to the enemy spell caster?

How many archers can fire at the thief hiding behind a pillar?

What happens when the heroes counter-fire arrows into melee?

Has “theater of the mind” descended into chaos and player confusion?

Is it fair to kill a hero because the player misunderstood the Game Master’s description of the battlefield?

And just how big is a Fire Ball, anyway?

If these types of questions have ever vexed your game, Oldskull Grid War might be for you.

This tactical supplement clarifies the existing Basic/Expert rules with demonstrations of miniatures on a battle grid. Instead of adding more rules, Grid War clarifies the existing often-confusing guidelines through multiple levels of optional complexity. It does not turn the RPG into a boardgame; rather, it provides explanatory support for every combat maneuver, monster, spell, and magic item in the B/X OSE game. The role-playing focus of the adventure remains intact, with enhanced visuals that turn the game’s action scenes into exciting play-by-play freezeframes of strike, maneuver, and counterstrike.

Instead of waiting “for their turn” and stating a simple action, Grid War allows the players to work as a team to develop tactics, formations, holding actions, zones of control, aisles of movement, and cooperative defender facing. Players can see who needs help, where everyone is, what everyone is doing, and they can focus on the visuals of monster positions, vulnerable targets, terrain, doorways, and opportune areas for mass attack and defense. Spell casting is no longer guesswork, it is a demonstration of player skill, tactical decisions, line of sight, range, and area of effect.

You can use this supplement with fully-painted miniatures and sculpted terrain; or, you can use pawns on a chessboard. Lego, erase boards, glass beads, and computer screens can all benefit from the rules and visual examples featured throughout this tome. If you want your players to be fully engaged, without losing control of the state of play, Oldskull Grid War will give you the tools you need for full-on tactical battle gaming.

Another classic Old-School gaming supplement from Kent David Kelly and Wonderland Imprints, Only the Finest Works of Fantasy.

Requires Old-School Essentials Core Rules.


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.

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
Jonathan F April 11, 2022 6:08 am UTC
oh cool, this one is for OSE. Do the other supplements work well for OSE?
Customer avatar
KEVIN D October 12, 2021 4:16 am UTC
This looks like the tactical shot in the arm B/X could really use for the crunchier style play groups. Your supplements to the older editions really enhance the game Mr. Kelly.
Customer avatar
Kent K October 12, 2021 4:38 am UTC
Thanks Kevin, I hope you enjoy it. I tried to strike a balance between playability and complexity, so I hope it's fun for other groups to experiment with.
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File Last Updated:
October 11, 2021
This title was added to our catalog on October 11, 2021.