The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Spiders (Developer) (4 members)
- Spike (Developer) (4 members)
- Spike Chunsoft (Developer) (3 members)
- Spike Chunsoft (Publisher) (6 members)
- SpinVector (Developer) (1 member)
- SpinVector (Publisher) (1 member)
- Splash Damage (Developer) (1 member)
- Sports (Genre) (266 members)
- Sports Champions (Series) (2 members)
- Sproing Interactive Media (Developer) (2 members)
- Sprout Games (Developer) (1 member)
- Square Enix (Developer) (9 members)
- Square Enix (Publisher) (40 members)
- Stainless Games (Developer) (5 members)
- Stainless Studios (Developer) (1 member)
- Star Ocean (Series) (3 members)
- Starbreeze Studios (Developer) (5 members)
- Start the Party! (Series) (2 members)
- Stealth (Genre) (32 members)
- Stealth Inc. (Series) (2 members)
- Stickmen Studios (Developer) (1 member)
- Stickmen Studios (Publisher) (1 member)
- Sting Entertainment (Developer) (2 members)
- StormBASIC (Developer) (1 member)
- StormBASIC (Publisher) (1 member)
- Straight Right (Developer) (1 member)
- Straight Right (Publisher) (1 member)
- Strange Loop Games (Developer) (1 member)
- Strategy (Genre) (60 members)
- Strawdog Studios (Developer) (1 member)
- Street Fighter (Series) (5 members)
- Strict rendering mode: On (Config) (13 members)
- Studio Saizensen (Developer) (1 member)
- Sucker Punch Productions (Developer) (4 members)
- Sullivan Bluth Interactive (Developer) (1 member)
- Sumo Digital (Developer) (12 members)
- Sunsoft (Publisher) (1 member)
- SuperBot Entertainment (Developer) (1 member)
- SuperVillain Studios (Developer) (2 members)
- Super Robot Wars (Series) (7 members)
- Super X Studios (Developer) (1 member)
- Superbike World Championship (Series) (3 members)
- Superflat Games (Developer) (1 member)
- Supermassive Games (Developer) (8 members)
- Supersonic Software (Developer) (1 member)
- Survival (Genre) (4 members)
- Survival horror (Genre) (37 members)
- Swordfish Studios (Developer) (1 member)
- Syberia (Series) (2 members)
- Synetic (Developer) (2 members)
- SystemSoft Alpha (Developer) (13 members)
- SystemSoft Alpha (Publisher) (13 members)
- System 3 (Developer) (1 member)
- System 3 (Publisher) (6 members)
- System Prisma (Developer) (1 member)
- THQ (Publisher) (55 members)
- THQ Digital Studios UK (Developer) (1 member)
- THQ Nordic (Publisher) (8 members)
- THQ San Diego (Developer) (1 member)
- THQ Studio Australia (Developer) (2 members)
- TREVA Entertainment (Publisher) (1 member)
- TSX instructions: Disabled (Config) (5 members)
- TT Fusion (Developer) (5 members)
- TT Games (Developer) (1 member)
- Tactical (Genre) (1 member)
- Tactical role-playing (Genre) (27 members)
- Taito (Developer) (3 members)
- Taito (Publisher) (1 member)
- Tales (Series) (6 members)
- Tales From Space (Series) (2 members)
- Tamsoft (Developer) (7 members)
- Tango Gameworks (Developer) (1 member)
- Targem Games (Developer) (5 members)
- Targem Games (Publisher) (2 members)
- Tarsier Studios (Developer) (1 member)
- TastyPlay (Developer) (1 member)
- Tate Multimedia (Developer) (1 member)
- Tate Multimedia (Publisher) (1 member)
- Team17 (Developer) (12 members)
- Team17 (Publisher) (9 members)
- Team6 Game Studios (Developer) (1 member)
- Team Bondi (Developer) (1 member)
- Team Ninja (Developer) (4 members)
- Team Shinobi (Developer) (2 members)
- Tears to Tiara (Series) (3 members)
- Techland (Developer) (7 members)
- Techland (Publisher) (2 members)
- Tecmo (Publisher) (2 members)
- Tecmo Koei (Publisher) (1 member)
- Teenage Mutant Ninja Turtles (Series) (4 members)
- Tekken (Series) (6 members)
- Televisa Home Entertainment (Publisher) (1 member)
- Telltale Games (Developer) (17 members)
- Telltale Games (Publisher) (16 members)
- Templates (22 members)
- Terminal Reality (Developer) (3 members)
- Terrible Posture Games (Developer) (1 member)
- Test Drive (Series) (2 members)
- Teyon (Developer) (4 members)
- Thatgamecompany (Developer) (6 members)
- The Adventure Company (Developer) (1 member)
- The Adventure Company (Publisher) (1 member)
- The Bearded Ladies Consulting (Developer) (1 member)
- The Behemoth (Developer) (1 member)
- The Bigs (Series) (2 members)
- The Darkness (Series) (2 members)
- The Elder Scrolls (Series) (2 members)
- The Farm 51 (Developer) (2 members)
- The Fyzz Facility (Publisher) (1 member)
- The Godfather (Series) (1 member)
- The House of the Dead (Series) (3 members)
- The Idolmaster (Series) (5 members)
- The King of Fighters (Series) (5 members)
- The Legend of Heroes (Series) (6 members)
- The Lord of the Rings (Series) (1 member)
- The Muteki Corporation (Developer) (2 members)
- The Muteki Corporation (Publisher) (2 members)
- The Odd Gentlemen (Developer) (1 member)
- The Price is Right (Series) (2 members)
- The Quantum Astrophysicists Guild (Developer) (1 member)
- The Quantum Astrophysicists Guild (Publisher) (1 member)
- The Simpsons (Series) (1 member)
- The Sims (Series) (3 members)
- The Voice (Series) (1 member)
- The Walking Dead (Series) (4 members)
- The Workshop (Developer) (1 member)
- Third-person shooter (Genre) (78 members)
- TickTock Games (Developer) (1 member)
- Tiger Hill Entertainment (Developer) (1 member)
- Tigon Studios (Developer) (2 members)
- TikGames (Developer) (4 members)
- TikGames (Publisher) (5 members)
- Tiki Games (Developer) (1 member)
- Tiki Games (Publisher) (1 member)
- TimeGate Studios (Developer) (2 members)
- TimeGate Studios (Publisher) (2 members)
- Time Crisis (Series) (2 members)
- Timeline Interactive (Developer) (1 member)
- Titan Studios (Developer) (1 member)
- ToeJam and Earl (Series) (2 members)
- Tom Clancy's Ghost Recon (Series) (2 members)
- Tom Clancy's H.A.W.X (Series) (2 members)
- Tom Clancy's Rainbow Six (Series) (1 member)
- Tom Clancy's Splinter Cell (Series) (3 members)
- Tomb Raider (Series) (4 members)
- Tony Hawk's (Series) (6 members)
- Top-down shooter (Genre) (5 members)
- 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)
- 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)
- Trine (Series) (2 members)
- Trine Games (Developer) (3 members)
- Trion Worlds (Developer) (1 member)
- Trion Worlds (Publisher) (1 member)
- Triumph Studios (Developer) (1 member)
- Trivia (Genre) (26 members)
- Tru Blu Entertainment (Publisher) (9 members)
- Turn-based (Genre) (1 member)
- Turn-based tactics (Genre) (4 members)
- Two Tribes (Developer) (1 member)
- UFC Undisputed (Series) (3 members)
- UFO Interactive Games (Publisher) (3 members)
- UIG Entertainment (Publisher) (1 member)
- UNKNOWN GAMES (Developer) (2 members)
- Ubisoft (Developer) (10 members)
- Ubisoft (Publisher) (101 members)
- Ubisoft Blue Byte (Developer) (1 member)
- Ubisoft Bucharest (Developer) (4 members)
- Ubisoft Milan (Developer) (3 members)
- Ubisoft Montpellier (Developer) (5 members)
- Ubisoft Montreal (Developer) (23 members)
- Ubisoft Paris (Developer) (2 members)
- Ubisoft Pune (Developer) (1 member)
- Ubisoft Quebec (Developer) (2 members)
- Ubisoft Reflections (Developer) (1 member)
- Ubisoft San Francisco (Developer) (2 members)
- Ubisoft Shanghai (Developer) (8 members)
- Ubisoft Singapore (Developer) (1 member)
- Ubisoft Sofia (Developer) (3 members)
- Ubisoft Toronto (Developer) (1 member)
- Ubisoft Vancouver (Developer) (1 member)
- Ultraman (Series) (1 member)
- Umineko no Naku Koro ni (Series) (2 members)
- Uncharted (Series) (3 members)
- Underground Development (Developer) (2 members)
- United Front Games (Developer) (3 members)
- United Game Artists (Developer) (1 member)
- Unknown/invalid (Release region) (0 members)
- Upper One Games (Developer) (1 member)
- Us! (Developer) (1 member)
- UserJoy Technology (Developer) (1 member)
- Userjoy Technology (Developer) (1 member)
- Userjoy Technology (Publisher) (1 member)
- Utawarerumono (Series) (2 members)
- VBlank NTSC Fixup: On (Config) (1 member)
- VSync: On (Config) (1 member)
- Valcon Games (Publisher) (4 members)
- Valve (Developer) (2 members)
- Valve (Publisher) (3 members)
- Vanguard Games (Developer) (1 member)
- Vanillaware (Developer) (2 members)
- Vatra Games (Developer) (2 members)
- Vblank Entertainment (Developer) (2 members)
- Vblank Entertainment (Publisher) (2 members)
- Vblank rate (Config) (30 members)
- VectorCell (Developer) (2 members)
- Vehicular combat (Genre) (14 members)
- Version2Games (Developer) (1 member)
- Vertical scrolling shooter (Genre) (1 member)
- Vertigo Digital Entertainment (Developer) (1 member)
- Vicarious Visions (Developer) (3 members)
- Vicious Cycle Software (Developer) (6 members)
- Vigil Games (Developer) (2 members)
- Virtua Fighter (Series) (2 members)
- Virtua Striker (Series) (1 member)
- Virtua Tennis (Series) (3 members)
- Virtual Air Guitar (Developer) (1 member)
- Virtual Air Guitar (Publisher) (1 member)
- Virtual On (Series) (1 member)
- Virtual World (Genre) (1 member)
- Virtual pet (Genre) (2 members)
- Virtuos (Developer) (2 members)
- Visceral Games (Developer) (12 members)