The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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) (736 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)
- PGA Tour (Series) (8 members)
- PPU LLVM Java mode handling: False (Config) (0 members)
- PPU LLVM Java mode handling: True (Config) (0 members)
- PPU LLVM accurate vector NaNs: On (Config) (1 member)
- PPU decoder: Interpreter (static) (Config) (15 members)
- PPU thread count: 1 (Config) (1 member)
- PQube (Publisher) (7 members)
- PSN status: Disconnected (Config) (1 member)
- PSN status: RPCN (Config) (5 members)
- PSN status: Simulated (Config) (3 members)
- PSR Outdoors (Developer) (2 members)
- PSR Outdoors (Publisher) (2 members)
- Pac-Man (Series) (3 members)
- PachiPara (Series) (3 members)
- Pachinko (Genre) (14 members)
- Page 44 Studios (Developer) (1 member)
- Pages using duplicate arguments in template calls (15 members)
- Pages using vgregion with named parameters (1 member)
- Pages with broken file links (1 member)
- Pages with too many expensive parser function calls (0 members)
- Pandemic Studios (Developer) (3 members)
- Paon Corporation (Developer) (1 member)
- Paon Corporation (Publisher) (1 member)
- Papaya Studio (Developer) (2 members)
- Paradigm Entertainment (Developer) (1 member)
- Paradox Interactive (Publisher) (2 members)
- Paramount Digital Entertainment (Publisher) (4 members)
- Party (Genre) (24 members)
- Patches available (242 members)
- Payday (Series) (2 members)
- Pelfast (Developer) (1 member)
- Pelfast (Publisher) (1 member)
- People Can Fly (Developer) (1 member)
- Persona (Series) (3 members)
- Phoenix Studio (Developer) (1 member)
- Pi Studios (Developer) (1 member)
- Piacci (Publisher) (1 member)
- Pieces Interactive (Developer) (2 members)
- Pinball (Genre) (7 members)
- Pipeworks Software (Developer) (6 members)
- Pipeworks Studios (Developer) (1 member)
- Piranha Bytes (Developer) (1 member)
- Piranha Games (Developer) (1 member)
- Pivotal Games (Developer) (1 member)
- PixelJunk (Series) (8 members)
- Pixel Tales (Developer) (1 member)
- Pixelnest Studio (Developer) (1 member)
- Pixelopus (Developer) (1 member)
- Pixolane (Developer) (1 member)
- Pixolane (Publisher) (1 member)
- Plants vs. Zombies (Series) (1 member)
- Plastic (Developer) (2 members)
- Platform (Genre) (168 members)
- Platine Dispositif (Developer) (1 member)
- PlatinumGames (Developer) (7 members)
- PlayStation 3 exclusive (Release type) (304 members)
- PlayStation exclusive (Release type) (186 members)
- Playbrains (Developer) (2 members)
- Playdead (Developer) (1 member)
- Playdead (Publisher) (1 member)
- Playlogic Entertainment (Developer) (4 members)
- Playlogic Entertainment (Publisher) (1 member)
- Playlogic Game Factory (Developer) (1 member)
- Playlogic International (Publisher) (1 member)
- Playrix Entertainment (Developer) (1 member)
- Plug In Digital (Publisher) (1 member)
- Plunge Interactive (Developer) (1 member)
- Point-and-click (Genre) (13 members)
- Point of View (Developer) (1 member)
- Polyphony Digital (Developer) (5 members)
- Polytron Corporation (Developer) (1 member)
- PomPom Games (Developer) (1 member)
- PomPom Software (Developer) (1 member)