Game System
- Carcassone: The Discovery1
- Card-to-Card1
- Castle Merchants1
- Caylus Magna Carta1
- Changeling: The Dreaming1
- Chess1
- Chill 1
- Cineplexity1
- Circus Magicus1
- Circus Maximus1
- Citadels/BattleLore1
- Classic Battletech Quick-Strike Rules1
- Classic Dungeons and Dragons1
- Cloud 91
- Conan the Roleplaying Game1
- Cover Up1
- Crafty Games House System1
- Crazy Horse Rule1
- Crazy Horse Rules1
- Crossover Battle Rules1