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TitleCodeDatePublisherSystem (Setting)
Boardgame I Am Providence2014 Self PublishedI Am Providence
Boardgame I Am the Fourth Wall2019 Slinky Gibbon GamesI Am the Fourth Wall
PDF I Pray God Will Curse the Writer2016 Teapot Dome GamesI Pray God Will Curse the Writer
PDF I Want to PlayFXC-072019 Stygian FoxCall of Cthulhu (Now)
PDF I Want You to Kill the Ice Cream Man2000 Self PublishedCall of Cthulhu (Now)
Boardgame Iaa! Cthulhu! Fhtagn!2016 Sphinx SpeileverlagIaa! Cthulhu! Fhtagn!
PDF Ice Cream Man *May 2019 ChaosiumCall of Cthulhu (Now)
PDF IconoclastsAPB81382022 Arc Dream PublishingDelta Green
PDF Icons of the Mythos2024 Ad Infinitum AdventuresICONS
PDF An Ideal Society2006 Self PublishedCall of Cthulhu (Now)
PDF The Idol of ThothDec 2017 Stygian FoxCall of Cthulhu (Classic)
Boardgame Igor Ichor Promo CardMar 2009 Steve Jackson GamesMunchkin
PDF Ill Omens Art PackDec 2017 ChaosiumCall of Cthulhu (Classic)
PDF The Illumination of Aldebaran2023 Gallant Knight GamesTiny Cthulhu
Magazine Imagine13Apr 1984 TSRCall of Cthulhu (Classic), None
Magazine Imagine28Jul 1985 TSRNone, Call of Cthulhu (Classic), Daredevils
Fanzine Imazine161987 Self PublishedCall of Cthulhu (Classic)
Fanzine The Immortal Minority21987 Self PublishedCall of Cthulhu (Classic)
Fanzine The Impaler1984 Self PublishedCall of Cthulhu (Classic)
PDF The Impossible ChamberJul 2024 ChaosiumCall of Cthulhu (Regency)
Hardback Impossible LandscapesAPU81452021 Arc Dream PublishingDelta Green
PDF In a Different Lightcr30012011 Cthulhu RebornCall of Cthulhu (Classic)
PDF In Dark and Lonely WatersJul 2024 ChaosiumCall of Cthulhu (Now)
PDF In Darkness We WaitApr 2024 ChaosiumCall of Cthulhu (Now)
PDF In From the Cold *2017 Golden Goblin PressCall of Cthulhu (Classic)
Cards In Memory of DayCT272009 Fantasy Flight GamesCall of Cthulhu LCG
Softback In Search of SanityPZO901092016 Paizo PublishingPathfinder
PDF In Strange Aeons: Lovecraftian NumeneraMCG014P2013 Monte Cook GamesNumenera
PDF In Strange SeasMay 2023 ChaosiumCall of Cthulhu (Regency)
Softback In Strange Seas: The Regency Cthulhu Naval CompendiumOct 2023 ChaosiumCall of Cthulhu (Regency)
Boardgame In the Clutches of Chaos *AHC342019 Fantasy Flight GamesArkham Horror: The Card Game
PDF In the Depths of Silverstring2020 Mundus InfinitosIn the Depths of Silverstring
Cards In the Dread of NightCT282009 Fantasy Flight GamesCall of Cthulhu LCG
PDF In the Shadow of the HornsDec 2021 ChaosiumCall of Cthulhu (Classic)
Softback In the ShadowsCHA23571995 ChaosiumCall of Cthulhu (Classic)
PDF In the Violet Hour Golden Goblin PressCall of Cthulhu (Invictus)
Boardgame In Too Deep *AHC532020 Fantasy Flight GamesArkham Horror: The Card Game
PDF In Xanthic TermsOct 2023 ChaosiumCall of Cthulhu (Now)
PDF The Incredible Dr QuinnJan 2022 ChaosiumCall of Cthulhu (Now)
PDF The Incriminating Letter2003 Self PublishedCall of Cthulhu (Classic)
Boardgame Indescribable Underworlds2025 Everything Epic GamesSecrets of the Lost Tomb
PDF INDIGO: Advancement PointsMay 2024 ChaosiumCall of Cthulhu (Now)
PDF Indigo: After the End of the WorldFeb 2018 ChaosiumCall of Cthulhu (Now)
PDF The Infaernum of Cthulhu2024 Mind's VisionInfaernum
PDF InfestationMar 2022 ChaosiumCall of Cthulhu (Classic)
Boardgame Infinite Gulfs of Darkness2021 LudonovaArkham Noir
PDF Inglorious Victorians2020 BendjinnCall of Cthulhu (Gaslight)
PDF InheritanceFS032007 Self PublishedCall of Cthulhu (Rising)
PDF Inheritance2019 ChaosiumCall of Cthulhu (Classic)
PDF Inhuman TraffickingSep 2023 Xipe Totec PressCall of Cthulhu (Now), Cthulhu Dark, Trail of Cthulhu, Cthulhu Obscura, Delta Green
Cards Initiations of the FavoredCT422011 Fantasy Flight GamesCall of Cthulhu LCG
PDF Injury CardsPELGY01IC2019 Pelgrane PressThe Yellow King
PDF Inncommers2016 Xipe Totec PressCthulhu Dark, Trail of Cthulhu, Delta Green, Call of Cthulhu (Now)
PDF An Inner CallSep 2020 ChaosiumCall of Cthulhu (Classic)
Softback An Inner DarknessGGP20012020 Golden Goblin PressCall of Cthulhu (Classic)
PDF The Inner LightJan 2024 ChaosiumCall of Cthulhu (Classic)
Boardgame Innsmouth 322020 GameWick GamesInnsmouth 32
Boardgame The Innsmouth Conspiracy *AHC522020 Fantasy Flight GamesArkham Horror: The Card Game
Boardgame The Innsmouth Curse2024 Self PublishedThe Innsmouth Curse
Softback The Innsmouth Cycle *CHA60172006 ChaosiumCall of Cthulhu (Classic)
Boardgame Innsmouth EscapeTLC34012008 Twilight CreationsInnsmouth Escape
PDF Innsmouth Handout Pack2021 base113 GamesCall of Cthulhu (Classic)
Boardgame Innsmouth Horror ExpansionVA572009 Fantasy Flight GamesArkham Horror
PDF The Innsmouth Lighthouse2009 Self PublishedRisus
Boardgame Innsmouth Mystery2023 Self PublishedInnsmouth Mystery
PDF The Innsmouth Papers2020 Self PublishedThe Innsmouth Papers
PDF Innsmouth Poster Maps2015 Lore Wise GamesCall of Cthulhu (Classic)
Softback Innsmouth: The Stolen Child2022 Blue Fox PublishingInnsmouth: The Stolen Child
Novelty Inperium RomanumCHA23115map2009 ChaosiumCall of Cthulhu (Invictus)
PDF Insanitarium2019 ChaosiumCall of Cthulhu (Classic)
Fanzine Intellect Devourer11987 Self PublishedCall of Cthulhu (Classic)
Fanzine Intellect Devourer7Jun 1988 Self PublishedCall of Cthulhu (Now)
Magazine Interface61992 Prometheus PublishingCall of Cthulhu (Cyberpunk)
Softback Interface 19.40MUH050027AC2015 Modiphius EntertainmentInterface Zero, Call of Cthulhu (Achtung!), Savage Worlds (Achtung!)
Softback The Intermountain Matrix Newsletter5Mar 1991 Self PublishedCall of Cthulhu (Classic)
Fanzine Interregnum30May 1999 Self PublishedCall of Cthulhu (Classic)
PDF Intersections2016 Xipe Totec PressCthulhu Dark, Trail of Cthulhu, Delta Green, Call of Cthulhu (Now)
PDF The Interstellar Colonial Marine Corps2008 Self PublishedCall of Cthulhu (Rising)
PDF Into a Dark HeartAug 2021 ChaosiumCall of Cthulhu (Classic)
Cards Into TartarusCT512011 Fantasy Flight GamesCall of Cthulhu LCG
PDF Into the GothicOct 2023 ChaosiumCall of Cthulhu (Classic)
Boardgame Into the Maelstrom *AHC582021 Fantasy Flight GamesArkham Horror: The Card Game
PDF Into the UnknownApr 2022 ChaosiumCall of Cthulhu (Strange Aeons) [2052]
Boardgame The Invasion *2021 Petersen GamesCthulhu Wars
Softback Invasive ProceduresPELG092011 Pelgrane PressTrail of Cthulhu
PDF InversionFeb 2024 ChaosiumCall of Cthulhu (Now)
Boardgame Investigator Expansion Pack2020 Purple Meeple GamesCultistorm
Novelty Investigator Mug SetCHA9303 ChaosiumNone
PDF Investigator Passports2019 base113 GamesTrail of Cthulhu, Call of Cthulhu (Classic)
Boardgame Investigator Promo Cards *2017 Fantasy Flight GamesElder Sign
Softback Investigator SheetsCHA51111993 ChaosiumCall of Cthulhu (Classic)
Softback Investigator Weapons Volume 1: The 1920s and 1930s60-IHB012012 Sixtystone PressCall of Cthulhu (Classic)
Softback Investigator Weapons Volume 2: Modern Day60-IHB022015 Sixtystone PressCall of Cthulhu (Now)
Softback Investigator Weapons Volume 3: Gaslight Era60-IHB03Jan 2023 Sixtystone PressCall of Cthulhu (Gaslight)
PDF The Investigator's Companion2020 M T Black GamesWhispers in the Dark
Softback Investigator's Guide to the Secret WarMPS01031CS2013 Modiphius EntertainmentSavage Worlds (Achtung!), Call of Cthulhu (Achtung!)
Hardback Investigator's Guide to the Secret War *MUH517402019 Modiphius EntertainmentCall of Cthulhu (Achtung!)
Hardback Investigator's HandbookCHA231362015 ChaosiumCall of Cthulhu (Classic)
Boardgame Investigators2019 Petersen GamesCthulhu Wars
Softback Investigators Kit *CHA5102 ChaosiumCall of Cthulhu (Classic)
Boardgame The Investigators of Arkham Horror *NAHCE12016 Fantasy Flight GamesArkham Horror: The Card Game
PDF Investigators of Horrors!Oct 2019 ChaosiumCall of Cthulhu (Classic)
PDF Invisible FiresDec 2023 Librarians and LeviathansCthulhu Eternal
PDF An Invitation in YellowFeb 2018 ChaosiumCall of Cthulhu (Classic)
PDF Invitation OnlyWitD12020 Saturday Morning ScenariosWhispers in the Dark
PDF Ira IncensaMar 2021 ChaosiumCall of Cthulhu (Classic)
PDF Ire of the Void *EAH122017 Fantasy Flight GamesArkham Horror
Boardgame Ire of the Void *NAH122017 Fantasy Flight GamesArkham Horror: The Card Game
PDF Irrational Express *2003 Self PublishedCall of Cthulhu (Classic)
PDF The Island *SKP011102011 Skirmisher PublishingCall of Cthulhu (Classic)
PDF The IslandJul 2024 ChaosiumCall of Cthulhu (Classic)
PDF Island 256May 2019 ChaosiumCall of Cthulhu (WWII)
PDF Island GetawayDec 2023 Modiphius EntertainmentAchtung! Cthulhu
PDF The Island of Dagon2021 One Shot RPGOne Shot RPG
Softback The Island of IgnoranceGGP13012013 Golden Goblin PressCall of Cthulhu (Classic)
PDF Island of Ignorance2023 Just Crunch GamesThe Cthulhu Hack
PDF Isle of MadnessDec 2017 ChaosiumCall of Cthulhu (Classic)
Softback It Came From Cthulhu2012 Planet Pulp ProductionsPulp Adventure
PDF It Came from the Wild Blue Yonder2010 Self PublishedIt Came from the Wild Blue Yonder
Softback The Ithaqua CycleCHA60211998 ChaosiumCall of Cthulhu (Classic)
Boardgame Ithaqua the Wind-Walker2023 CMON LimitedCthulhu: Death May Die (Fear of the Unknown)
PDF The Itinerant HotelMay 2021 ChaosiumCall of Cthulhu (Classic)