The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Sonic Rumble (2 members)
- Sonic Runners (5 members)
- Sonic Runners Adventure (3 members)
- Sonic Rush (5 members)
- Sonic Rush Adventure (6 members)
- Sonic Speed Simulator (4 members)
- Sonic Spinball (16-bit) (1 member)
- Sonic Spinball (8-bit) (2 members)
- Sonic Superstars (7 members)
- Sonic Team (5 members)
- Sonic Underground (1 member)
- Sonic Unleashed (Wii/PlayStation 2) (3 members)
- Sonic Unleashed (Xbox 360/PlayStation 3) (3 members)
- Sonic X (1 member)
- Sonic X Shadow Generations (2 members)
- Sonic and the Black Knight (1 member)
- Sonic and the Secret Rings (2 members)
- Sonic game characters infoboxes (2 members)
- Sonic robots (1 member)
- Sonic the Fighters (5 members)
- Sonic the Hedgehog (4 members)
- Sonic the Hedgehog: The Movie (1 member)
- Sonic the Hedgehog (16-bit) staff (3 members)
- Sonic the Hedgehog (1991) (4 members)
- Sonic the Hedgehog (1991) alternate versions and ports (1 member)
- Sonic the Hedgehog (2006) (4 members)
- Sonic the Hedgehog (8-bit) (3 members)
- Sonic the Hedgehog (Didj) (1 member)
- Sonic the Hedgehog (TV series) (1 member)
- Sonic the Hedgehog (film series) (1 member)
- Sonic the Hedgehog (film series) staff (1 member)
- Sonic the Hedgehog 10th Anniversary (1 member)
- Sonic the Hedgehog 15th Anniversary (2 members)
- Sonic the Hedgehog 20th Anniversary (3 members)
- Sonic the Hedgehog 2 (16-bit) (5 members)
- Sonic the Hedgehog 2 (8-bit) (2 members)
- Sonic the Hedgehog 4 (3 members)
- Sonic the Hedgehog 4: Episode I (3 members)
- Sonic the Hedgehog 4: Episode II (4 members)
- Sonic the Hedgehog CD (2 members)
- Sonic the Hedgehog CD (2011) (1 member)
- Sonic the Hedgehog Level Creator (1 member)
- Sonic the Hedgehog Pocket Adventure (3 members)
- Sonic the Hedgehog Triple Trouble (4 members)
- Sony platforms (6 members)
- Sorting templates (1 member)
- Space stations (2 members)
- Spacecraft (1 member)
- Speed types (9 members)
- Spin-offs (19 members)