The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Toxic Games (Publisher) (1 member)
- Toy Story (Series) (1 member)
- Toybox Inc. (Developer) (1 member)
- Toys for Bob (Developer) (4 members)
- Tozai Games (Publisher) (3 members)
- Tragnarion Studios (Developer) (1 member)
- Trails (Series) (1 member)
- Train Simulator (Genre) (2 members)
- Train Simulator (Series) (2 members)
- Transformers (Series) (7 members)
- Transmission Games (Developer) (2 members)
- Trapdoor (Developer) (1 member)
- Trapdoor (Publisher) (1 member)
- Traveller's Tales (Developer) (16 members)
- Treasure Co. (Developer) (1 member)
- Trendy Entertainment (Developer) (1 member)
- Treyarch (Developer) (8 members)
- Tri-Ace (Developer) (4 members)
- Tri-Crescendo (Developer) (2 members)
- Trickstar Games (Developer) (3 members)