The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Ghost Games (Developer) (1 member)
- Ghostlight (Publisher) (3 members)
- Giant Sparrow (Developer) (1 member)
- Giants Software (Developer) (2 members)
- Go! Sports (Series) (1 member)
- God of War (Series) (4 members)
- Golden Axe (Series) (2 members)
- Golden Ruby Games (Developer) (1 member)
- Gonzo Games (Developer) (1 member)
- Gotch Technology (Developer) (1 member)
- Gran Turismo (Series) (5 members)
- Grand Theft Auto (Series) (4 members)
- Graphic Adventure (Genre) (16 members)
- Grasshopper Manufacture (Developer) (5 members)
- Green Hill Games (Developer) (1 member)
- Grid (Series) (3 members)
- Grimm Bros (Developer) (1 member)
- Grimm Bros (Publisher) (1 member)
- Grin (Developer) (4 members)
- Grip Digital (Publisher) (1 member)
- Grip Games (Developer) (3 members)
- Grip Games (Publisher) (2 members)
- Griptonite Games (Developer) (7 members)
- Guerrilla Cambridge (Developer) (1 member)
- Guerrilla Games (Developer) (3 members)
- Guilty Gear (Series) (3 members)
- Guitar Hero (Series) (12 members)
- Gulti (Developer) (1 member)
- Gundam Breaker (Series) (2 members)
- Gundam VS (Series) (2 members)
- GungHo Online Entertainment (Publisher) (1 member)
- Gust (Developer) (1 member)
- Gust Co. Ltd. (Developer) (10 members)
- Gust Co. Ltd. (Publisher) (5 members)
- Gusto Games (Developer) (4 members)
- Guyzware (Developer) (1 member)
- H2 Interactive (Publisher) (1 member)
- HB Studios (Developer) (4 members)
- Hack and slash (Genre) (91 members)
- Hakuoki (Series) (2 members)
- Halfbrick Studios (Developer) (1 member)
- Hamster Corporation (Publisher) (1 member)
- HandCircus (Developer) (1 member)
- HandCircus (Publisher) (1 member)
- Handball (Series) (2 members)
- Handle RSX memory tiling: On (Config) (15 members)
- Happinet Corporation (Publisher) (1 member)
- Happy Dance Games (Developer) (1 member)
- Happy Dance Games (Publisher) (1 member)
- Harmonix (Developer) (13 members)