The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- TopWare Interactive (Publisher) (3 members)
- Top Spin (Series) (2 members)
- Topware Interactive (Publisher) (1 member)
- Torn Banner Studios (Developer) (1 member)
- Torn Banner Studios (Publisher) (1 member)
- Torus Games (Developer) (4 members)
- Torus Games (Publisher) (1 member)
- Tose (Developer) (1 member)
- Tower defense (Genre) (15 members)
- Toxic Games (Developer) (1 member)
- 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)