サプリメント

• Cthulhu Britannica
• Cthulhu Britannica Avalon
• Cthulhu Britannica Folklore
• Cthulhu Britannica Shadows over Scotland
• Cthulhu Britannica London The Curse of Nineveh
• Secrets of Japan
• Secrets of Kenya
• Secrets of Los Angeles
• Secrets of Morocco
• Secrets of New York
• Secrets of New Orleans
• Secrets of San Francisco
• Secrets of Tibet
• 1920s Investigator Companion
• Beyond the Mountains of Madness
• Pulp Cthulhu
• Delta Green Targets of Opportunity
• Delta Green Eyes Only
• Horror Roleplaying in 1890s England（Cthulhu by Gaslight）
• Japan - Empire of Shadows
• Investigator Handbook
• Keeper Tips
• Investigator Weapons Volume2

シナリオ集

• Doors to Darkness
• Shadows of Yog-Sothoth
• Spawn of Azathoth
• The Two-Headed Serpent（Pulp Cthulhu）
• The Masks of Nyarlathotep