Game System
- Cryptic: A Puzzles and Pathways Adventure30
- Cryptid Codex3
- Cryptozoic1
- Crypts & Things1
- Crystal Clans1
- Crystallized7
- Crystallo17
- Cthulhu22
- Cthulhu Awakens1
- Cthulhu Dark30
- Cthulhu Dark Age1
- Cthulhu Dark Ages34
- Cthulhu Gloom4
- Cthulhu Invictus1
- Cthulhu LIVE1
- Cthulhu Live141
- Cthulhu Live 2
- Cthulhu Live - Modified with house rules1
- Cthulhu Live (Homebrew)3
- Cthulhu Live (Simplified)1