The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Koei Canada (Developer) (1 member)
- Koei Tecmo (Developer) (28 members)
- Koei Tecmo (Publisher) (70 members)
- Koihime†Musou (Series) (2 members)
- Kojima Productions (Developer) (7 members)
- Konami (Developer) (21 members)
- Konami (Publisher) (78 members)
- Krome Studios (Developer) (4 members)
- Kuju Entertainment (Developer) (1 member)
- Kuju Entertainment (Publisher) (1 member)
- Kung Fu Factory (Developer) (4 members)
- Kung Fu Panda (Series) (3 members)
- Kuno Interactive (Developer) (1 member)
- Kush Games (Developer) (4 members)
- Kylotonn (Developer) (11 members)
- Kyouraku Sangyou Holdings (Developer) (2 members)
- Kyouraku Sangyou Holdings (Publisher) (2 members)
- LEGO (Series) (3 members)
- LOOT Entertainment (Publisher) (2 members)
- La Voz (Series) (2 members)
- Lancarse (Developer) (1 member)
- Land Ho! (Developer) (1 member)
- Laughing Jackal (Developer) (1 member)
- Laughing Jackal (Publisher) (1 member)
- Le Cortex (Developer) (1 member)
- Le Tour de France (Series) (5 members)
- Leader (Publisher) (1 member)
- Learning With the PooYoos (Series) (2 members)
- Left Field Productions (Developer) (3 members)
- Legacy parameters used (Config) (0 members)
- Lesta Studio (Developer) (1 member)
- Lesta Studio (Publisher) (1 member)
- Level-5 (Developer) (3 members)
- Level-5 (Publisher) (1 member)
- Lexis Numérique (Developer) (4 members)
- Lexis Numérique (Publisher) (5 members)
- Life simulation (Genre) (9 members)
- LightBox Interactive (Developer) (1 member)
- Lightning Fish (Developer) (3 members)
- Lionsfilm (Developer) (1 member)
- Lionsfilm (Publisher) (1 member)
- Liquid Entertainment (Developer) (3 members)
- LittleBigPlanet (Series) (6 members)
- Little Orbit (Developer) (1 member)
- Little Orbit (Publisher) (7 members)
- Live-Action (Genre) (1 member)
- Live Action Studios (Developer) (1 member)
- London Studio (Developer) (42 members)
- Longtail Studios (Developer) (1 member)
- Longtail Studios Québec (Developer) (1 member)
- Loose Cannon Studios (Developer) (1 member)
- Los 40 Principales: Karaoke Party (Series) (2 members)
- Lost Planet (Series) (4 members)
- Lua modules (14 members)
- Lucasarts (Developer) (3 members)
- Lucasarts (Publisher) (9 members)
- Lucid Games (Developer) (1 member)
- Ludia (Developer) (6 members)
- Ludia (Publisher) (6 members)
- Ludia Inc. (Developer) (1 member)
- Ludia Inc. (Publisher) (1 member)
- Lumenox EHF (Developer) (1 member)
- Lumenox EHF (Publisher) (1 member)
- Luxoflux (Developer) (2 members)
- M2 (Developer) (8 members)
- MLB: The Show (Series) (10 members)
- MLB 2K (Series) (7 members)
- MLB Advanced Media (Publisher) (1 member)
- MMO (Genre) (10 members)
- MOSS (Developer) (2 members)
- MOSS (Publisher) (1 member)
- MTV Games (Publisher) (9 members)
- MX vs. ATV (Series) (4 members)
- MachineGames (Developer) (1 member)
- Macross (Series) (3 members)
- Mad Catz Interactive (Publisher) (1 member)
- Mad Dog (Series) (1 member)
- Madagascar (Series) (3 members)
- Madden NFL (Series) (12 members)
- Magenta Software (Developer) (1 member)
- Magic Pixel Games (Developer) (1 member)
- Magnolia (Developer) (1 member)
- Maid meets Cat (Developer) (1 member)
- Mainichi Communications (Developer) (1 member)
- Mainichi Communications (Publisher) (1 member)
- Majesco Entertainment (Publisher) (6 members)
- Marvel Super Hero Squad (Series) (2 members)
- Marvel Ultimate Alliance (Series) (2 members)
- Marvel vs. Capcom (Series) (4 members)
- Marvelous Entertainment (Publisher) (4 members)
- Marvelous Inc. (Publisher) (1 member)
- Marvelous USA (Publisher) (1 member)
- Mass Effect (Series) (3 members)
- Mass Media Games (Developer) (1 member)
- Mastertronic Group (Publisher) (1 member)
- Mastiff (Publisher) (3 members)
- Matt Hazard (Series) (2 members)
- Maximum Family Games (Publisher) (1 member)
- Maximum Games (Publisher) (1 member)
- Maximum SPURS threads (Config) (5 members)
- Medal of Honor (Series) (4 members)
- Media.Vision (Developer) (1 member)
- Media Factory (Developer) (1 member)
- Media Molecule (Developer) (4 members)
- Mega Man (Series) (2 members)
- Memories Off (Series) (2 members)
- MercurySteam (Developer) (4 members)
- Metal Gear (Series) (6 members)
- Metal Slug (Series) (3 members)
- Metalhead Software (Developer) (1 member)
- Metalhead Software (Publisher) (1 member)
- Metroidvania (Genre) (1 member)
- MicroProse (Developer) (1 member)
- Micro Graphic Image (Developer) (1 member)
- Microphone type: Disabled (Config) (1 member)
- Microsoft Studios (Publisher) (1 member)
- Microïds (Developer) (2 members)
- Middle-Earth (Series) (1 member)
- Midnight City (Publisher) (2 members)
- Midway Austin (Developer) (1 member)
- Midway Games (Developer) (3 members)
- Midway Games (Publisher) (8 members)
- Midway Studios Los Angeles (Developer) (1 member)
- Midway Studios Newcastle (Developer) (1 member)
- Mighty Rocket Studio (Developer) (1 member)
- Milestone (Developer) (16 members)
- Milestone (Publisher) (6 members)
- Millennium Kitchen (Developer) (1 member)
- Minato Soft (Developer) (1 member)
- Minato Soft (Publisher) (1 member)
- Mine Loader Software (Developer) (1 member)
- Minecraft (Series) (1 member)
- Minority Media (Developer) (1 member)
- Minority Media (Publisher) (1 member)
- Missing GameID parameter (GameID) (6 members)
- Missing GameID parameter (Infobox) (0 members)
- Missing IRD parameter (GameID) (0 members)
- Missing game mode parameter (Infobox) (735 members)
- Missing genre parameter (Infobox) (17 members)
- Missing internal resolution parameter (Infobox) (2,034 members)
- Missing release date parameter (Infobox) (108 members)
- Missing release type parameter (Infobox) (36 members)
- Mobile Suit Gundam (Series) (13 members)
- Mojang Studios (Developer) (1 member)
- Mondo Productions (Developer) (1 member)
- MonkeyPaw Games (Publisher) (2 members)
- Monkey Bar Games (Developer) (5 members)
- Monkey Island (Series) (1 member)
- Monolith Productions (Developer) (6 members)
- Monopoly (Series) (1 member)
- Monster Hunter (Series) (2 members)
- Monumental Games (Developer) (2 members)
- Moonbite Games (Developer) (1 member)
- Moonbite Games (Publisher) (1 member)
- Moonbot Studios (Developer) (1 member)
- Mortal Kombat (Series) (4 members)
- Mossmouth (Developer) (1 member)
- Mossmouth (Publisher) (1 member)
- Most Wanted Entertainment (Developer) (2 members)
- MotoGP (Series) (6 members)
- MotorStorm (Series) (4 members)
- Move Street Cricket (Series) (2 members)
- Move handler: Fake (Config) (1 member)
- Move handler: Mouse (Config) (3 members)
- Moving Player (Publisher) (2 members)
- Mugen Souls (Series) (2 members)
- Multi-platform (Release type) (1,165 members)
- Multiplayer (Game mode) (814 members)
- Multithreaded RSX: Off (Config) (2 members)
- Multithreaded RSX: On (Config) (24 members)
- Music (Genre) (83 members)
- Mutated Software (Developer) (1 member)
- Mutated Software (Publisher) (1 member)
- Muv-Luv (Series) (5 members)
- Mycom (Publisher) (1 member)
- Mynavi (Developer) (3 members)
- Mynavi (Publisher) (2 members)
- N-Space (Developer) (1 member)
- NASCAR (Series) (6 members)
- NBA (Series) (3 members)
- NBA 2K (Series) (13 members)
- NBA Live (Series) (4 members)
- NCAA Basketball (Series) (3 members)
- NCAA Football (Series) (7 members)
- NHL (Series) (10 members)
- NHL 2K (Series) (4 members)
- NIS America (Publisher) (2 members)
- NOW Production (Developer) (3 members)
- Naked Sky Entertainment (Developer) (2 members)
- Namco Tales Studio (Developer) (4 members)
- Naruto: Ultimate Ninja (Series) (5 members)
- National Geographic Games (Publisher) (1 member)
- Natsume-Atari (Developer) (2 members)
- Natsume (Publisher) (2 members)
- NaturalMotion (Developer) (2 members)
- Naughty Bear (Series) (1 member)
- Naughty Dog (Developer) (5 members)
- Navel (Developer) (1 member)
- Need for Speed (Series) (9 members)
- Neko Entertainment (Developer) (2 members)
- Nerve Software (Developer) (1 member)
- NetherRealm Studios (Developer) (4 members)
- Netplay tested (Netplay) (580 members)
- Network status: Connected (Config) (9 members)
- Network status: Disconnected (Config) (1 member)
- Neutron Games (Developer) (1 member)
- Neverland (Developer) (2 members)
- Neversoft (Developer) (9 members)
- New 38th Floor Productions (Publisher) (2 members)
- News (Genre) (1 member)
- Nex Entertainment (Developer) (3 members)
- Next Level Games (Developer) (1 member)
- Nihilistic Software (Developer) (3 members)
- Nihon Falcom (Developer) (2 members)
- Nihon Falcom (Publisher) (2 members)
- NinjaBee (Developer) (1 member)
- Ninja Gaiden (Series) (5 members)
- Ninja Theory (Developer) (3 members)
- Nippon Ichi Software (Developer) (11 members)
- Nippon Ichi Software (Publisher) (37 members)
- Nitroplus (Developer) (2 members)
- Nitroplus (Publisher) (1 member)
- Nobilis (Publisher) (1 member)
- Noego (Developer) (1 member)
- North America (Release region) (1,616 members)
- Novarama (Developer) (1 member)
- Now Production (Developer) (1 member)
- Number None (Developer) (1 member)
- Number None (Publisher) (1 member)
- O-Games (Publisher) (2 members)
- OG International (Publisher) (1 member)
- O Games (Publisher) (1 member)
- Obsidian Entertainment (Developer) (4 members)
- Obut Pétanque (Series) (2 members)
- Oddworld (Series) (3 members)
- Oddworld Inhabitants (Publisher) (3 members)
- Old School Games (Developer) (2 members)
- Omega Force (Developer) (33 members)
- Omni Systems (Developer) (1 member)
- One Piece (Series) (4 members)
- One True Game Studios (Developer) (1 member)
- Ongakukan (Developer) (2 members)
- Ongakukan (Publisher) (2 members)
- Operation Flashpoint (Series) (2 members)
- Orange Juice (Developer) (1 member)
- Other Ocean Interactive (Developer) (3 members)
- Output scaling: FidelityFX Super Resolution (FSR) (Config) (1 member)
- Over The Top Games (Developer) (1 member)
- Overkill Software (Developer) (2 members)
- PAN Vision (Publisher) (1 member)