| | Date | System | File release date | Page creation date |
|---|
| 666: The Number of the Beast (Jun 5, 1989 prototype) | | Commodore 64 | | |
| ATV Racing (Apr 7, 2000 prototype A) | | Game Boy Color | | |
| ATV Racing (Apr 7, 2000 prototype B) | | Game Boy Color | | |
| ATV Racing (Prototype A) | | Game Boy Color | | |
| ATV Racing (Prototype B) | | Game Boy Color | | |
| Acid House (prototype) | | Commodore 64 | | |
| Activision TV Games (Aug 18, 2000 prototype) | | SNES | | |
| Activision TV Games (Aug 8, 2000 prototype) | | SNES | | |
| Activision TV Games (Aug 9, 2000 prototype) | | SNES | | |
| Activision TV Games (Jul 14, 2000 prototype) | | SNES | | |
| Activision TV Games (Jul 27, 2000 prototype) | | SNES | | |
| Activision TV Games (Jul 4, 2000 prototype) | | SNES | | |
| Activision TV Games (Jun 15, 2000 prototype) | | SNES | | |
| Activision TV Games (Jun 20, 2000 prototype) | | SNES | | |
| Activision TV Games (Jun 28, 2000 prototype) | | SNES | | |
| Activision TV Games (Jun 29, 2000 prototype) | | SNES | | |
| Activision TV Games (Jun 7, 2000 prototype) | | SNES | | |
| Activision TV Games (Jun 8, 2000 prototype) | | SNES | | |
| Activision TV Games (SNES prototype) | | SNES | | |
| Advanced Dungeons & Dragons: Heroes of the Lance (Amstrad CPC prototype) | | Amstrad CPC | | |
| Aladdin (Aug 23, 1994 prototype) | | NES | | |
| Aladdin's Cave (Commodore 64 prototype A) | | Commodore 64 | | |
| Aladdin's Cave (Commodore 64 prototype B) | | Commodore 64 | | |
| Alfred Chicken (ECTS Show 1993 Prototype) | | Amiga | | |
| Alfred J. Kwak (prototype A) | | Commodore 64 | | |
| Alfred J. Kwak (prototype B) | | Commodore 64 | | |
| Alien Olympics (Amiga prototype) | | Amiga | | |
| Alien Olympics (Aug 10, 1994 prototype) | | PC | | |
| Alien Olympics (Oct 5, 1994 prototype) | | PC | | |
| Alien Olympics 2044 AD (Jun 14, 1994 prototype) | | Game Boy | | |
| Alien Olympics 2044 AD (prototype A) | | Game Boy | | |
| Alien Olympics 2044 AD (prototype B) | | Game Boy | | |
| Alloyrun (Antaeus prototype) | | Commodore 64 | | |
| Apocalypse II (Oct 28, 1997 prototype) | | SNES | | |
| Apprentice (Commodore 64 prototype) | | Commodore 64 | | |
| Armalyte (Competition Edition) | | Commodore 64 | | |
| Armalyte II (V0.1 prototype) | | Commodore 64 | | |
| Armalyte II (V0.2 prototype) | | Commodore 64 | | |
| Armalyte II (V0.3 prototype) | | Commodore 64 | | |
| Armalyte II (V0.4 prototype) | | Commodore 64 | | |
| Army Men: Sarge's Heroes (Aug 22, 2000 prototype) | | Game Boy Advance | | |
| Army Men: Sarge's Heroes (Aug 31, 2000 prototype) | | Game Boy Advance | | |
| Army Men: Sarge's Heroes (Sep 14, 2000 prototype A) | | Game Boy Advance | | |
| Army Men: Sarge's Heroes (Sep 14, 2000 prototype B) | | Game Boy Advance | | |
| Army Men: Sarge's Heroes (Sep 6, 2000 prototype) | | Game Boy Advance | | |
| Army Men: Sarge's Heroes (Sep 8, 2000 prototype) | | Game Boy Advance | | |
| Battle Ball (prototype A) | | Commodore 64 | | |
| Battle Ball (prototype B) | | Commodore 64 | | |
| Battle Ball (prototype C) | | Commodore 64 | | |
| Battle Ball (prototype D) | | Commodore 64 | | |
| Beast (Rasmus prototype A) | | Commodore 64 | | |
| Beast (Rasmus prototype B) | | Commodore 64 | | |
| Bloodline (prototype) | | Amiga | | |
| Bobby Bounce Back (Final build) | | Commodore 64 | | |
| Bobby Bounce Back (prototype A) | | Commodore 64 | | |
| Bobby Bounce Back (prototype B) | | Commodore 64 | | |
| Bobby Bounce Back (prototype C) | | Commodore 64 | | |
| Bobby Bounce Back (prototype D) | | Commodore 64 | | |
| Bobby Bounce Back (prototype E) | | Commodore 64 | | |
| Bobby Bounce Back (prototype F) | | Commodore 64 | | |
| Bobby Bounce Back (prototype G) | | Commodore 64 | | |
| Bobby Bounce Back (prototype H) | | Commodore 64 | | |
| Bobby Bounce Back (prototype I) | | Commodore 64 | | |
| Bobby Bounce Back (prototype J) | | Commodore 64 | | |
| Bobby Bounce Back (prototype K) | | Commodore 64 | | |
| Bomb (prototype) | | Commodore 64 | | |
| Bombo (Rooster Booster prototype) | | Commodore 64 | | |
| Brain Pain (Jan 30, 1983 prototype) | | Commodore VIC-20 | | |
| Brainleak (prototype) | | Commodore 64 | | |
| Bubbler (May 10, 1988 prototype) | | Commodore 64 | | |
| Bugs Bunny: Private Eye (1991 prototype) | | Commodore 64 | | |
| Bugs Bunny: Private Eye (Nov 26, 1992 prototype) | | Commodore 64 | | |
| Bushido Warrior (May 25, 1988 prototype) | | Amstrad CPC | | |
| CJ's Island Antics (Early prototype) | | Commodore 64 | | |
| Captain Dynamo 2 (prototype) | | Commodore 64 | | |
| Championship Run (Commodore 64 prototype) | | Commodore 64 | | |
| Chaos Drop (Mar 10, 1993 prototype) | | SNES | | |
| Chaos Drop (Mar 3, 1993 prototype) | | SNES | | |
| Chaos Drop (prototype) | | SNES | | |
| Chariot Race (prototype) | | Commodore VIC-20 | | |
| Chicken Challenge (Oct 21, 1982 prototype) | | Commodore VIC-20 | | |
| Chicken Challenge (Super Frog prototype) | | Commodore VIC-20 | | |
| Circus Fun (prototype) | | Commodore 64 | | |
| Colony (Early prototype) | | Commodore 64 | | |
| Cookie (Commodore 64 prototype) | | Commodore 64 | | |
| Creatures (Fuzzy Wuzzy prototype) | | Commodore 64 | | |
| Creatures 2: Torture Trouble (Bonus game prototype) | | Commodore 64 | | |
| Croc (Early prototype A) | | Game Boy Color | | |
| Croc (Early prototype B) | | Game Boy Color | | |
| Daffy Duck Starring in The Great Paint Caper (prototype) | | Commodore 64 | | |
| Dave Mirra Freestyle BMX (Dec 1, 1999 prototype A) | | Game Boy Color | | |
| Dave Mirra Freestyle BMX (Dec 1, 1999 prototype B) | | Game Boy Color | | |
| Dave Mirra Freestyle BMX (Feb 28, 2000 prototype) | | Game Boy Color | | |
| Dave Mirra Freestyle BMX (Jan 19, 2000 prototype) | | Game Boy Color | | |
| Deadlock (v0.04 prototype) | | Commodore 64 | | |
| Deadlock (v0.07 prototype) | | Commodore 64 | | |
| Deadlock (v0.08 prototype) | | Commodore 64 | | |
| Deadlock (v0.09 prototype) | | Commodore 64 | | |
| Deadlock (v0.21 prototype) | | Commodore 64 | | |
| Deadlock (v0.28 prototype) | | Commodore 64 | | |
| Deadlock (v0.32 prototype) | | Commodore 64 | | |
| Deadlock (v0.36 prototype) | | Commodore 64 | | |
| Deadlock (v0.37 prototype) | | Commodore 64 | | |
| Deadlock (v0.38 prototype) | | Commodore 64 | | |
| Deadlock (v0.3C prototype) | | Commodore 64 | | |
| Deadlock (v0.44 prototype) | | Commodore 64 | | |
| Deadlock (v0.48 prototype) | | Commodore 64 | | |
| Deadlock (v1.0 prototype) | | Commodore 64 | | |
| Deadlock (v1.1 prototype) | | Commodore 64 | | |
| Deadlock (v1.2 prototype) | | Commodore 64 | | |
| Devious Designs (Early C64 prototype A) | | Commodore 64 | | |
| Devious Designs (Early C64 prototype B) | | Commodore 64 | | |
| Devious Designs (Early C64 prototype C) | | Commodore 64 | | |
| Devious Designs (Early C64 prototype D) | | Commodore 64 | | |
| Devious Designs (Early C64 prototype E) | | Commodore 64 | | |
| Devious Designs (Early C64 prototype F) | | Commodore 64 | | |
| Devious Designs (Late C64 prototype) | | Commodore 64 | | |
| Dr. Franken 3 (Jun 10, 1993 prototype) | | Game Boy | | |
| Dragon Spirit (Commodore 64 prototype) | | Commodore 64 | | |
| Dragon Spirit (Sep 5, 1989 prototype) | | Commodore 64 | | |
| Duel (Quicksilva build) | | Commodore 64 | | |
| Dying High (Markt und Technik build) | | Commodore 64 | | |
| Dying High (Zzap! build) | | Commodore 64 | | |
| Elite (Feb 14, 1992 prototype) | | NES | | |
| Frog Dude (Prototype) | | Sega Mega Drive | | |
| Full Time Soccer (Aug 23, 2000 prototype) | | Game Boy Color | | |
| Full Time Soccer (Jun 26, 2000 prototype) | | Game Boy Color | | |
| Full Time Soccer (Sep 11, 2000 prototype) | | Game Boy Color | | |
| Fungus II (prototype A) | | Commodore 64 | | |
| Fungus II (prototype B) | | Commodore 64 | | |
| Gen 13 (Mar 20, 1997 prototype) | | PlayStation | | |
| Golden Pyramids 2: The Shadows of Egypt (Ending prototype) | | Commodore 64 | | |
| Golden Pyramids 2: The Shadows of Egypt (Gameplay prototype A) | | Commodore 64 | | |
| Golden Pyramids 2: The Shadows of Egypt (Gameplay prototype B) | | Commodore 64 | | |
| Golden Pyramids 2: The Shadows of Egypt (Gameplay prototype C) | | Commodore 64 | | |
| Golden Pyramids 2: The Shadows of Egypt (Gameplay prototype D) | | Commodore 64 | | |
| Golden Pyramids 2: The Shadows of Egypt (Intro prototype A) | | Commodore 64 | | |
| Golden Pyramids 2: The Shadows of Egypt (Intro prototype B) | | Commodore 64 | | |
| Golden Pyramids 2: The Shadows of Egypt (Intro prototype C) | | Commodore 64 | | |
| Golden Pyramids 2: The Shadows of Egypt (Reconstructed build) | | Commodore 64 | | |
| Green Thang (prototype) | | Amiga | | |
| Groovy Electric Death (Oct 10, 1988 prototype) | | Commodore 64 | | |
| Gyro Shoc (prototype) | | Commodore 64 | | |
| Hang Time Basketball (Aug 29, 2000 prototype) | | Game Boy Color | | |
| Hang Time Basketball (Aug 31, 2000 prototype) | | Game Boy Color | | |
| Hang Time Basketball (Aug 5, 2000 prototype) | | Game Boy Color | | |
| Hang Time Basketball (Sep 2, 2000 prototype) | | Game Boy Color | | |
| Hill 19 (Amstrad CPC prototype) | | Amstrad CPC | | |
| Humblebug (prototype) | | Commodore 64 | | |
| It's a Knockout (Oct 28, 1986 prototype) | | Commodore 64 | | |
| Jimmy White's Whirlwind Snooker (Atari ST prototype) | | Atari ST | | |
| Jimmy White's Whirlwind Snooker (Aug 13, 1990 prototype) | | Atari ST | | |
| Jimmy White's Whirlwind Snooker (Jun 26, 1992 prototype A) | | PC | | |
| Jimmy White's Whirlwind Snooker (Jun 26, 1992 prototype B) | | PC | | |
| Jimmy White's Whirlwind Snooker (May 15, 1992 prototype A) | | PC | | |
| Jimmy White's Whirlwind Snooker (May 15, 1992 prototype B) | | PC | | |
| Jimmy White's Whirlwind Snooker (May 18, 1990 prototype) | | Atari ST | | |
| John Lowe's Ultimate Darts (Apr 4, 1988 prototype) | | Commodore 64 | | |
| John Lowe's Ultimate Darts (Early Commodore 64 prototype A) | | Commodore 64 | | |
| John Lowe's Ultimate Darts (Early Commodore 64 prototype B) | | Commodore 64 | | |
| John Lowe's Ultimate Darts (Jan 1989 prototype) | | Commodore 64 | | |
| John Lowe's Ultimate Darts (Jul 4, 1988 prototype) | | Commodore 64 | | |
| Kenny Dalglish Soccer Match (Commodore 64 prototype) | | Commodore 64 | | |
| Kevin Keegan's Player Manager (Aug 11, 1993 prototype) | | SNES | | |
| Kevin Keegan's Player Manager (Autodemo) | | SNES | | |
| Kevin Keegan's Player Manager (Jun 18, 1993 prototype) | | SNES | | |
| Kick Off (Jul 24, 1992 prototype) | | SNES | | |
| Kick Off 2 (Early Commodore 64 prototype) | | Commodore 64 | | |
| Kick Off 3: European Challenge (Broken prototype) | | Game Boy | | |
| Kick Off 3: European Challenge (Feb 1, 1994 prototype A) | | Sega Mega Drive | | |
| Kick Off 3: European Challenge (Feb 1, 1994 prototype B) | | Sega Mega Drive | | |
| Kick Off 3: European Challenge (Game Boy prototype) | | Game Boy | | |
| Kick Off 3: European Challenge (SNES prototype A) | | SNES | | |
| Kick Off 3: European Challenge (SNES prototype B) | | SNES | | |
| Koshimo (Frank Juerke intro) | | Commodore 64 | | |
| Labyrinths (prototype) | | Commodore 64 | | |
| Last Mission (Jul 6, 1987 build) | | Commodore 64 | | |
| Lazer Tag (Feb 18, 1988 prototype) | | Commodore 64 | | |
| Liberator (CDS Software prototype) | | Commodore 64 | | |
| Little Beau (Commodore 64 prototype) | | Commodore 64 | | |
| Little Puff in Dragonland (Apr 14, 1990 prototype) | | Commodore 64 | | |
| Little Puff in Dragonland (Commodore 64 prototype A) | | Commodore 64 | | |
| Little Puff in Dragonland (Commodore 64 prototype B) | | Commodore 64 | | |
| Little Puff in Dragonland (Commodore 64 prototype C) | | Commodore 64 | | |
| Lunar Jetman (Aug 18, 1985 prototype) | | Commodore 64 | | |
| Magician's Apprentice (Aug 11, 1993 prototype) | | TXC Multi-system | | |
| Magician's Apprentice (Sep 12, 1994 prototype) | | PC | | |
| Magician's Apprentice (Sep 29, 1994 prototype) | | PC | | |
| Make My Day (Final build) | | Commodore 64 | | |
| Make My Day (prototype) | | Commodore 64 | | |
| Mayhem in Monsterland (Oct 18, 2000 prototype) | | Game Boy Color | | |
| Mechanoids II: The Final Conflict (Later prototype) | | SNES | | |
| Mechanoids II: The Final Conflict (Sep 24, 1992 prototype) | | SNES | | |
| Mia Hamm Soccer 64 (Aug 1, 2000 prototype) | | Nintendo 64 | | |
| Mia Hamm Soccer 64 (Sep 1, 2000 prototype) | | Nintendo 64 | | |
| Micro Machines 1 and 2: Twin Turbo (Early prototype) | | Game Boy Color | | |
| Micro Machines 1 and 2: Twin Turbo (Late prototype) | | Game Boy Color | | |
| Micro Machines 1 and 2: Twin Turbo (Oct 14, 1999 prototype) | | Game Boy Color | | |
| Micro Machines 1 and 2: Twin Turbo (Prototype A) | | Game Boy Color | | |
| Micro Machines 1 and 2: Twin Turbo (Prototype B) | | Game Boy Color | | |
| Micro Machines 1 and 2: Twin Turbo (Prototype C) | | Game Boy Color | | |
| Micro Machines 1 and 2: Twin Turbo (Sep 23, 1999 prototype A) | | Game Boy Color | | |
| Micro Machines 1 and 2: Twin Turbo (Sep 23, 1999 prototype B) | | Game Boy Color | | |
| Microprose Soccer (Commodore 64 prototype A) | | Commodore 64 | | |
| Microprose Soccer (Commodore 64 prototype B) | | Commodore 64 | | |
| Moonsweeper (Sep 1, 1983 prototype) | | Commodore VIC-20 | | |
| Nigel Mansell's World Championship Racing (Mar 29, 1993 prototype) | | Commodore 64 | | |
| Nigel Mansell's World Championship Racing (Sep 29, 1992 prototype) | | NES | | |
| Nuker (prototype A) | | Commodore 64 | | |
| Nuker (prototype B) | | Commodore 64 | | |
| Paddle Mania (Sep 9, 1988 prototype) | | Commodore 64 | | |
| Pang (Sep 3, 1990 prototype) | | Commodore 64 | | |
| Perplexus Diodomin (Apr 9, 2002 prototype) | | Game Boy Advance | | |
| Pizza Delivery (prototype) | | Commodore 64 | | |
| Platform Mania (prototype) | | Commodore 64 | | |
| Populous (Dec 10, 1992 prototype) | | Game Boy | | |
| Populous (Feb 17, 1993 build) | | Game Boy | | |
| Populous (Game Boy prototype A) | | Game Boy | | |
| Populous (Game Boy prototype B) | | Game Boy | | |
| Populous (NES prototype) | | NES | | |
| Populous (Nov 26, 1992 prototype) | | Game Boy | | |
| Porky Pig's Haunted Holiday (Mar 16, 1994 prototype) | | SNES | | |
| Porky Pig's Haunted Holiday (May 24, 1994 prototype) | | SNES | | |
| Porky Pig's Haunted Holiday (Nov 1, 1993 INTROS prototype) | | SNES | | |
| Porky Pig's Haunted Holiday (Nov 1, 1993 R&D prototype) | | SNES | | |
| Porky Pig's Haunted Holiday (Nov 10, 1993 prototype) | | SNES | | |
| Prehistorik Kart (prototype) | | Game Boy Advance | | |
| Private Property (prototype) | | Commodore 64 | | |
| Putty (Commodore 64 prototype) | | Commodore 64 | | |
| Putty Squad (Nov 20, 1999 prototype) | | Game Boy Color | | |
| Quix (prototype) | | Commodore 64 | | |
| R.I.S.K. (Early prototype B) | | Commodore 64 | | |
| Rapid Steel (prototype B) | | Commodore 64 | | |
| Re-Volt (Apr 13, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Apr 5, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Dec 15, 1999 prototype) | | Game Boy Color | | |
| Re-Volt (Dec 17, 1999 prototype A) | | Game Boy Color | | |
| Re-Volt (Dec 17, 1999 prototype B) | | Game Boy Color | | |
| Re-Volt (Dec 31, 1999 prototype A) | | Game Boy Color | | |
| Re-Volt (Dec 31, 1999 prototype B) | | Game Boy Color | | |
| Re-Volt (Feb 1, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Feb 18, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Feb 20, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Feb 25, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Feb 28, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Feb 29, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Feb 3, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Feb 4, 2000 prototype A) | | Game Boy Color | | |
| Re-Volt (Feb 4, 2000 prototype B) | | Game Boy Color | | |
| Re-Volt (Feb 7, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Feb 8, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Jan 14, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Jan 23, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Jan 25, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Jan 26, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Jan 29, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Jan 30, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Jan 4, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Mar 15, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Mar 16, 2000 prototype A) | | Game Boy Color | | |
| Re-Volt (Mar 16, 2000 prototype B) | | Game Boy Color | | |
| Re-Volt (Mar 22, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Mar 23, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Mar 6, 2000 prototype) | | Game Boy Color | | |
| Re-Volt (Mar 8, 2000 prototype) | | Game Boy Color | | |
| Resident Evil (Feb 14, 2000 prototype) | | Game Boy Color | | |
| Resident Evil (Final prototype) | | Game Boy Color | | |
| Riamel: Black Prophecy (prototype) | | Amiga | | |
| Road Rash (Aug 10, 2000 prototype) | | Game Boy Color | | |
| Road Rash (Aug 7, 2000 prototype) | | Game Boy Color | | |
| RoboCop (Apr 7, 1997 prototype) | | PlayStation | | |
| Rubicon 2 (prototype) | | Commodore 64 | | |
| Runestone (Commodore 64 build) | | Commodore 64 | | |
| Rygar (Commodore 64 build) | | Commodore 64 | | |
| Sensible Soccer (Aug 15, 1993 prototype) | | Game Boy | | |
| Sensible Soccer (Game Boy prototype) | | Game Boy | | |
| Sensible Soccer (NES prototype) | | NES | | |
| Shutdown (Mar 13, 1989 prototype) | | Commodore 64 | | |
| Shylock (prototype) | | Commodore 64 | | |
| Slideways (prototype) | | Commodore 64 | | |
| Slidez (prototype) | | Commodore 64 | | |
| Snoball in Hell (Commodore 64 prototype A) | | Commodore 64 | | |
| Snoball in Hell (Commodore 64 prototype B) | | Commodore 64 | | |
| Software Manager (German prototype) | | Commodore 64 | | |
| Solar Jetman (Commodore 64 prototype) | | Commodore 64 | | |
| Some Metal Head (Dec 9, 1999 prototype) | | Game Boy Color | | |
| Sooty and Sweep 2 (Amstrad CPC prototype) | | Amstrad CPC | | |
| Sooty and Sweep 2 (Atari 8-bit prototype) | | Atari 8bit (PC) | | |
| Sooty and Sweep 2 (Commodore 64 prototype) | | Commodore 64 | | |
| Sooty and Sweep 2 (Early Atari 8-bit prototype) | | Atari 8bit (PC) | | |
| Sooty and Sweep 2 (Early Commodore 64 prototype) | | Commodore 64 | | |
| Sooty and Sweep 2 (ZX Spectrum prototype) | | ZX Spectrum | | |
| Sorcerer (prototype) | | Game Boy | | |
| Spindizzy (Early Commodore 64 prototype) | | Commodore 64 | | |
| Splitz (Aug 11, 1992 prototype) | | Game Boy | | |
| Splitz (Feb 17, 1993 prototype) | | Game Boy | | |
| Splitz (Jan 19, 1993 prototype) | | Game Boy | | |
| Splitz (Oct 28, 1992 prototype) | | Game Boy | | |
| Splitz (Sep 2, 1992 prototype) | | Game Boy | | |
| Starglider 2 (Jun 13, 1989 prototype) | | Commodore 64 | | |
| Starline (prototype) | | Commodore 64 | | |
| Starsat (prototype) | | Commodore 64 | | |
| Strobe (prototype B) | | Commodore 64 | | |
| Stuntman Seymour (May 19, 1993 prototype) | | Amiga | | |
| Super Kick Off (Prototype) | | NES | | |
| Survivor Run (prototype) | | Commodore VIC-20 | | |
| T-26 (prototype) | | Commodore 64 | | |
| Team SAS (Apr 16, 2003 prototype) | | Xbox | | |
| The Addams Family: Pugsley's Scavenger Hunt (Apr 22, 1993 prototype) | | Game Boy | | |
| The Addams Family: Pugsley's Scavenger Hunt (Game Boy prototype) | | Game Boy | | |
| The Addams Family: Pugsley's Scavenger Hunt (Jan 21, 1993 NTSC prototype) | | NES | | |
| The Addams Family: Pugsley's Scavenger Hunt (Jan 21, 1993 PAL prototype) | | NES | | |
| The Addams Family: Pugsley's Scavenger Hunt (Jan 25, 1993 prototype) | | NES | | |
| The Addams Family: Pugsley's Scavenger Hunt (Jan 28, 1993 NTSC prototype) | | NES | | |
| The Addams Family: Pugsley's Scavenger Hunt (Jan 28, 1993 PAL prototype) | | NES | | |
| The Addams Family: Pugsley's Scavenger Hunt (Jul 13, 1993 prototype) | | NES | | |
| The Addams Family: Pugsley's Scavenger Hunt (May 14, 1993 Prototype) | | NES | | |
| The Blues Brothers: Jukebox Adventure (Oct 27, 1993 prototype) | | Amiga | | |
| The Lion King (Mar 7, 1994 NES prototype) | | NES | | |
| The Lion King (May 9, 1994 prototype) | | NES | | |
| The Power of Black Bandit (prototype) | | Commodore 64 | | |
| Thomas the Tank Engine 2: The Race (Amstrad CPC prototype) | | Amstrad CPC | | |
| Thomas the Tank Engine 2: The Race (Atari 8-bit prototype) | | Atari 8bit (PC) | | |
| Thomas the Tank Engine 2: The Race (Commodore 64 prototype) | | Commodore 64 | | |
| Thomas the Tank Engine 2: The Race (Early ZX Spectrum prototype) | | ZX Spectrum | | |
| Thomas the Tank Engine 2: The Race (ZX Spectrum prototype) | | ZX Spectrum | | |
| Thunder Zone (Later prototype) | | Commodore 64 | | |
| Tiger Road (Commodore 64 prototype) | | Commodore 64 | | |
| Tiny Troops (Apr 1, 1994 prototype) | | PC | | |
| Tiny Troops (Apr 13, 1994 prototype) | | PC | | |
| Tiny Troops (Apr 8, 1994 prototype) | | PC | | |
| Tiny Troops (Aug 16, 1994 prototype) | | PC | | |
| Tiny Troops (Aug 9, 1994 prototype) | | PC | | |
| Tiny Troops (Feb 11, 1994 prototype) | | PC | | |
| Tiny Troops (Feb 23, 1994 prototype) | | PC | | |
| Tiny Troops (Jan 17, 1994 prototype) | | PC | | |
| Tiny Troops (Jan 24, 1994 prototype) | | PC | | |
| Tiny Troops (Jul 13, 1994 prototype) | | PC | | |
| Tiny Troops (Jul 21, 1994 prototype) | | PC | | |
| Tiny Troops (Jun 13, 1995 prototype) | | PC | | |
| Tiny Troops (Jun 3, 1994 prototype) | | PC | | |
| Tiny Troops (Mar 11, 1994 prototype) | | PC | | |
| Tiny Troops (Mar 17, 1994 prototype) | | PC | | |
| Tiny Troops (Mar 25, 1994 prototype) | | PC | | |
| Tiny Troops (Nov 14, 1994 prototype) | | PC | | |
| Tiny Troops (Nov 23, 1993 prototype) | | PC | | |
| Tiny Troops (Nov 29, 1993 prototype) | | PC | | |
| Tiny Troops (Nov 4, 1993 prototype) | | PC | | |
| Tiny Troops (Nov 8, 1994 prototype) | | PC | | |
| Tiny Troops (Oct 13, 1993 prototype) | | PC | | |
| Tiny Troops (Oct 25, 1993 prototype) | | PC | | |
| Tiny Troops (Oct 28, 1993 prototype) | | PC | | |
| Tiny Troops (Oct 28, 1994 prototype) | | PC | | |
| Tiny Troops (Oct 5, 1993 prototype) | | PC | | |
| Tiny Troops (Oct 9, 1994 prototype) | | PC | | |
| Tiny Troops (Sep 20, 1993 prototype) | | PC | | |
| Tiny Troops (Sep 21, 1994 prototype) | | PC | | |
| Tiny Troops (Sep 30, 1993 prototype) | | PC | | |
| Tip Off (Dec 10, 1992 prototype) | | Game Boy | | |
| Tip Off (Feb 17, 1993 prototype) | | SNES | | |
| Tip Off (Feb 22, 1994 prototype) | | Game Boy | | |
| Tip Off (Game Boy prototype A) | | Game Boy | | |
| Tip Off (Game Boy prototype B) | | Game Boy | | |
| Tip Off (Mar 17, 1993 prototype) | | SNES | | |
| Tip Off (Mar 25, 1993 prototype) | | SNES | | |
| Tip Off (NES prototype - Music) | | NES | | |
| Tip Off (NES prototype) | | NES | | |
| Tip Off (Nov 10, 1992 prototype) | | Game Boy | | |
| Titus the Fox (Jan 18, 1994 prototype) | | SNES | | |
| Tork (Jan 29, 2003 prototype) | | Game Boy Advance | | |
| Tran (prototype) | | Commodore 64 | | |
| Trax (prototype) | | Game Boy | | |
| Troddlers (Alter Developments prototype B) | | Commodore 64 | | |
| Tuna Technologies Race Engine (Jan 20, 2000 tech demo) | | Game Boy Color | | |
| Tuna Technologies Race Engine (Nov 14, 1999 tech demo) | | Game Boy Color | | |
| Tuna Technologies Race Engine (Nov 15, 1999 tech demo) | | Game Boy Color | | |
| Turn Change (prototype A) | | Commodore 64 | | |
| Turn Change (prototype B) | | Commodore 64 | | |
| Turn Change (prototype C) | | Commodore 64 | | |
| Tyger Tyger (Nov 18, 1987 prototype) | | Commodore 64 | | |
| UFO II (prototype) | | Commodore 64 | | |
| UFO III (prototype) | | Commodore 64 | | |
| Wacky Races (Nov 5, 1991 prototype) | | Commodore 64 | | |
| World Class Rugby (Dec 8, 1992 prototype) | | SNES | | |
| World Class Rugby (Jul 11, 1992 prototype) | | SNES | | |
| X'treme Roller (Aug 7, 2000 prototype) | | PlayStation | | |
| X'treme Roller (Jul 17, 2000 prototype) | | PlayStation | | |
| X'treme Roller (Jul 27, 2000 prototype) | | PlayStation | | |
| X'treme Roller (Jul 28, 2000 prototype) | | PlayStation | | |
| X'treme Roller (Sep 2, 2000 PC prototype) | | PC | | |
| Zone of Darkness (Character demo) | | Commodore 64 | | |
| Zrenite (prototype) | | Commodore 64 | | |