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- 1970-73 – Editor-in-Chief, Guidon Games (publisher of Wargaming rules and wargames)
- 1973-83 – Partner of TSR and then President of TSR Hobbies, Inc.
- 1983-85 – President, DUNGEONS & DRAGONS Entertainment Corporation
- Co-Producer, DUNGEONS & DRAGONS Animated Television Show
- 1983-85 – Chairman of the Board of Directors and President (1985 only) of TSR, Inc.
- 1986-88 – Chairman of the Board of Directors, New Infinities Productions, Inc.
- 1988-94 – Creator/author under contract to Omega Helios Limited
- 1995-... – Creator/author under contract to Trigee Enterprises Corporation
- 1999-... – Partner, Hekaforge Productions
Boot Hill - role-playing elements in the Wild West, with Brian Blume, 1975
Dungeons & DragonsEdit
- Greyhawk (with Rob Kuntz)
- Eldritch Wizardry (with Brian Blume)
- Swords & Spells
- The Book of Marvelous Magic (with Frank Mentzer)
- The Keep on the Borderlands
Advanced Dungeons & DragonsEdit
- Rule books:
- Dungeon Geomorphs (3 sets)
- Outdoor Geomorphs
- Monster & Treasure Assortments (3 sets)
- D1 Descent Into the Depths of the Earth
- D2 Shrine of the Kuo-Toa
- D3 Vault of the Drow
- EX1 Dungeonland
- EX2 The Land Beyond the Magic Mirror
- G1 Steading of the Hill Giant Chief
- G2 Glacial Rift of the Frost Giant Jarl
- G3 Hall of the Fire Giant King
- Q1 Queen of the Demonweb Pits (with Dave Sutherland)
- S1 Tomb of Horrors
- S3 Expedition to the Barrier Peaks
- S4 The Lost Caverns of Tsojcanth
- T1 The Village of Hommlet
- T1-4 The Temple of Elemental Evil (with Frank Mentzer)
- WG4 The Forgotten Temple of Tharizdun
- WG5 Mordenkainen's Fantastic Adventure (with Rob Kuntz)
- WG6 Isle of the Ape
- Mythus – (with Dave Newton), Game Designers Workshop, 1992
- Mythus Magick – Book II of the MYTHUS Game (with Dave Newton), GDW, 1992
- Epic of Ærth – Companion Volume to the MYTHUS Game, GDW, 1992
- Necropolis – Adventure Scenario, GDW, 1993
- Mythus Bestiary, Ærth Animalia – (with Dave & Michele Newton), GDW, 1993
- Changeling – Weird Science Fantasy Role-Playing Game, published in part in Mythic Masters Magazine (see Periodicals)
- Rule books:
- Lejendary Rules for All Players - Hekaforge Productions, 1999
- Lejend Master's Lore - Hekaforge Productions, 2000
- Beasts of Lejend - Hekaforge Productions, 2000
- World Setting sourcebooks:
- Legendary Earth Gazetteer - Part 1, Hekaforge Productions, 2002
- Noble Kings & Dark Lands - Part 2, (with Chris Clark) Hekaforge Productions, 2003
- The Mysterious Realms of Hazgar – Part 3, (with Chris Clark) Hekaforge Productions, 2005
- Living the Lejend - Campaign Setting & Expansion for the LA Essentials Boxed Set, Troll Lord Games (2005)
- Forlorn Corners - included serially as a part of the Author’s and Collector’s Editions of the three core rules noted above (1999-2000)
- Hall of Many Panes – Module Boxed Set with D20 stats included, Troll Lord Games 2005
- Lejendary Adventure Essentials - Primer Boxed Set for the LA RPG, Troll Lord Games, 2005
Castles & CrusadesEdit
For Castles & Crusades, the Castle Zagyg series is a planned series of seven sourcebooks based on the Castle Greyhawk from Gygax's original campaign. For trademark reasons they are not actually published under the name of Greyhawk.
- Castle Zagyg, Vol. 1: Yggsburgh Troll Lord Games, 2005 (ISBN 1-931275-68-8)
Generic d20 SystemEdit
- A Challenge of Arms - (Chris Clark with Gary Gygax) generic adventure module, Inner City Game Designs, 1999
- Ritual of the Golden Eyes - (Chris Clark with Gary Gygax) generic adventure module, Inner City Game Designs, 2000
- The Weyland Smith Catalog - ("Joke" Magic Items), short version, Hekaforge Productions, 1999
- Gygaxian Fantasy Worlds Series from Troll Lord Games. Volumes IV, V, VI are edited by Gygax.
- Volume I Gary Gygax’s The Canting Crew, explores the underworld of city life, "Gygaxian Fantasy Worlds, Volume II"
- Volume II Gary Gygax’s World Builder, a collection of organized definitions, lists, tables and charts, (with Dan Cross) – 2003
- Volume III Gary Gygax’s Living Fantasy, Everyday Life, – 2003
- Volume IV Gary Gygax’s Book of Names by Malcolm Bowers
- Volume V Gary Gygax’s Insidiae by Dan Cross 2004
- Volume VI Gary Gygax’s Nation Builder, by Michael J. Varhola – 2005
Rules for miniatures/table top battle gamesEdit
- Cavaliers and Roundheads (English Civil War, with Jeff Perren)
- Chainmail (Medieval and Fantasy, with Jeff Perren)
- Classic Warfare (Ancient Period: 1500 BC to 500 AD)
- Don't Give Up The Ship! (Sailing Ship Battles c. 1700 to 1815, with Dave Arneson & Mike Carr)
- Tractics (WWII to c. 1965, with Mike Reese & Leon Tucker)
- Foreword to the 2004 Skirmisher Publishing LLC edition of H.G. Wells' Little Wars
- Alexander the Great (Ancient, the Battle of Arbela) – Guidon Games and reprinted by Avalon Hill
- Alexander's Other Battles – Panzerfaust Publishing, 1972 – a Supplementary Kit For The Guidon Game Alexander the Great
- Baku (WW II, Extension of The Avalon Hill Company’s Stalingrad board wargame), Panzerfaust Publications
- Crusader (Medieval, Battle of Ascalon) – Panzerfaust Publications
- Dunkirk (World War II) – Guidon Games
- Little Big Horn (Western) – TSR Hobbies, Inc.
- Another of Gary Gygax's creations was Dragon chess, a three-dimensional fantasy chess variant, published in Dragon Magazine #100 (August 1985). It is played on three 8x12 boards stacked on top of each other - the top board represents the sky, the middle is the ground, and the bottom is the underworld. The pieces are characters and monsters inspired by the Dungeons and Dragons setting: King, Mage, Paladin, Cleric, Dragon, Griffin, Oliphant, Hero, Thief, Elemental, Basilisk, Unicorn, Dwarf, Sylph and Warrior.
- Fidchell – Not to be confused with the historic board game of fidchell (various spellings) from Ireland.
- Greyhawk Adventures Series of Novels (from TSR, Inc., featuring Gord the Rogue)
- Saga of Old City (1985)
- Artifact of Evil (1986)
- Gord the Rogue Adventures (from New Infinities Productions, Inc., also published in Italian)
- Sea of Death (1987)
- Night Arrant (1987) – a collection of short stories
- City of Hawks (1987)
- Come Endless Darkness (1988)
- Dance of Demons (1988)
- released under publisher Penguin/Roc
- The Anubis Murders (1992)
- The Samarkand Solution (1993)
- Death in Delhi (1993)
Misc books & short storiesEdit
- Sagard the Barbarian Books (HEROES CHALLENGE Gamebook Series, co-author Flint Dille (with assistance from Ernie Gygax) - from Archway/Pocket books):
- The Ice Dragon
- The Green Hydra
- The Crimson Sea
- The Fire Demon
- Role-Playing Mastery - instructional book, Perigee/Putnam (trade paperback bestseller)
- Master of the Game - sequel to Role-Playing Mastery from Perigee/Putnam
- "At Moonset Blackcat Comes" (Fantasy short story featuring Gord the Rogue appearing in Dragon Magazine #100)
- "Pay Tribute" (Science Fiction short story in The Fleet anthology)
- "Battle off Deadstar" (Science Fiction short story in Fleet Breakthrough anthology)
- "Celebration of Celene" (Fantasy short story published in Michael Moorcock’s Elric, Tales of the White Wolf anthology) - White Wolf, Inc., 1994
- "Duty" (Fantasy short story in Excalibur, anthology) – Warner Books, 1995
- "Get on Board the D Train" (Horror short story in Dante’s Disciples anthology) – White Wolf, Inc., 1996
- Evening Odds" (Fantasy short story with Gord the Rogue sharing Michael Moorcock’s Eternal Champions universe) – White Wolf, Inc., 1997
- The Crusader – magazine, column on the creation of the D&D game beginning 2005
- Dragon Magazine - author to 1985, and a columnist therein 1999 to 2004
- Journeys Journal (GDW) - contributor in each of six issues published through 1993
- Lejends (Total Reality Studios) – magazine, major contributor, 2001 to 2003
- Mythic Masters (Trigee) - magazine, primary author of entire 64-page magazine for each of six issues published through 1994
- The Strategic Review (Tactical Studies Rules) – newsletter, primary author of entire magazine for each of the initial four issues, and a major contributor to the balance of all issues until DRAGON Magazine came into print.
- La Vivandiere (Palikar Publications) – defunct wargaming magazine, contributing author (1974), significant contributions include "Fantasy Wargaming and the Influence of J.R.R. Tolkien", in which he defends D&D's inclusion of non-Tolkien fantasy into the game.
- Uncredited (November 1985). “TSR Profiles: Gary Gygax”. In Kim Mohan ed. Dragon #103 (TSR, Inc.), p. 56.
- Allen Varney (June 1998). “ProFiles: Gary Gygax”. In Dave Gross ed. Dragon #248 (TSR, Inc.), p. 120.
- "An Interview with Gary Gygax" by Christopher Smith on the Legendary Adventure website.
- Gygax at Troll Lord Games is a listing of the Gary Gygax branded products sold by them.
- "Interview: Gary Gygax" at Kittenpants.org
- Q&A with Gary Gygax at Dragonsfoot
- "The Ultimate Interview with Gary Gygax" at thekyngdoms.com