Game System
- Conspriracy X/Unisystem5
- Continuum5
- Cortex System5
- Cortex+5
- Cosmic Encounters5
- Countdown: Special Ops5
- Cranium5
- Crazy Uncle Charlie5
- Critical: Foundation5
- Cthulhu Wars 5
- Cults Across America5
- Curios5
- Current Number of the Beast5
- CyberPunk 20205
- Cyberworld: Dark Ages of the 21st Century5
- D&D Minis5
- D12 Showdown5
- DE BELLIS ANTIQUITATIS5
- DE BELLIS ANTIQUITIES by WRG5
- DOCTOR WHO Game by FASA5