The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Chunsoft (Developer) (1 member)
- Chunsoft (Publisher) (1 member)
- Cipher Prime (Developer) (2 members)
- Cipher Prime (Publisher) (1 member)
- City Interactive (Developer) (5 members)
- City Interactive (Publisher) (5 members)
- Clap Hanz (Developer) (3 members)
- Class of Heroes (Series) (2 members)
- ClassiC Shikoukairo (Developer) (1 member)
- Clever Beans (Developer) (1 member)
- Climax Studios (Developer) (2 members)
- Clocks scale (Config) (0 members)
- Co-op (Game mode) (367 members)
- Code Mystics (Developer) (1 member)
- Codeglue (Developer) (1 member)
- Codemasters (Developer) (17 members)
- Codemasters (Publisher) (27 members)
- Coffee Stain Studios (Developer) (2 members)
- Cohort Studios (Developer) (6 members)
- ColdWood Interactive (Developer) (3 members)