The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Positioning templates (3 members)
- Power types (8 members)
- Preload templates (5 members)
- Princesses (1 member)
- Programming typing-aid templates (3 members)
- Publishing companies (2 members)
- Puyo Puyo! Sega games (2 members)
- Puzzle games (1 member)
- Racing games (6 members)
- Rated E10+ games (8 members)
- Rated E games (37 members)
- Rated T games (1 member)
- Real world (1 member)
- Redirect category template documentation pages (3 members)
- Redirect templates (5 members)
- Redirects from alternative names (2 members)
- Redirects from merges (4 members)
- Redirects from modifications (3 members)
- Redirects from moves (12 members)
- Redirects from shortcuts (9 members)
- Redirects to redirect templates (4 members)
- Resizing templates (2 members)
- Rodents (1 member)
- Science and nature templates parameter issues (1 member)
- Sega Game Gear games (4 members)
- Sega Master System games (2 members)
- Sega Mega Drive games (3 members)
- Sega Saturn games (1 member)
- Sega Streaming Theater Sonic Edition (2 members)
- Sega Superstars Tennis (1 member)
- Sega platform games (1 member)
- Sega platforms (17 members)
- Semantic markup templates (3 members)
- Series (2 members)
- Shadow Generations (4 members)
- Shadow the Hedgehog (1 member)
- Shadow the Hedgehog (game) (4 members)
- Shows (7 members)
- Software table cell templates (2 members)
- Sol Dimension inhabitants (1 member)
- Songbirds (1 member)
- Sonic's transformations (1 member)
- Sonic & All-Stars Racing Transformed (2 members)
- Sonic & Sega All-Stars Racing (2 members)
- Sonic 3D Blast (2 members)
- Sonic 3 & Knuckles (3 members)
- Sonic 3 & Knuckles locations (2 members)
- Sonic Advance (6 members)
- Sonic Advance 2 (5 members)
- Sonic Advance 3 (6 members)