| | Date | System | File release date | Page creation date |
|---|
| Al Unser Jr.'s Road to the Top (Sega Genesis prototype) | | Sega Mega Drive | | |
| Arkanoid II (Nov 11, 1987 prototype) | | MSX2 | | |
| Arkanoid II (prototype B) | | NES | | |
| Bakushou!! Jinsei Gekijou (Early prototype) | | NES | | |
| Bakushou!! Jinsei Gekijou (Oct 13, 1988 prototype) | | NES | | |
| Buzz & Waldog (Prototype B) | | NES | | |
| Crossbow (Early prototype) | | NES | | |
| Cygnus Force (prototype) | | NES | | |
| Dan Marino's Powerplay Football (prototype) | | Sega Mega Drive | | |
| Death Race (prototype) | | NES | | |
| Dropzone (Oct 6, 1992 prototype) | | NES | | |
| Eclipse (prototype) | | Game Boy | | |
| European Club Soccer (Oct 8, 1991 prototype) | | Sega Mega Drive | | |
| Galaga (1983 Atari prototype) | | NES | | |
| Garfield: Caught in the Act (The Lost Levels build) | | Sega Mega Drive | | |
| Hoppin' Mad (prototype) | | NES | | |
| Hydra (Atari Lynx prototype) | | Atari Lynx | | |
| Jerry Glanville's Pigskin Footbrawl (SNES prototype) | | SNES | | |
| Kawasaki Superbike Challenge (SNES prototype) | | SNES | | |
| Krazy Kreatures (prototype) | | NES | | |
| Kyuukyoku Harikiri Stadium (Prototype) | | NES | | |
| Light Crusader (Debugging prototype) | | Sega Mega Drive | | |
| Magi Cube (prototype) | | NES | | |
| Magical Puzzle Popils (Incomplete prototype) | | NES | | |
| Maxivision 30-in-1 (prototype) | | NES | | |
| Maxivision 30-in-1 Super Games (Aug 9, 1991 prototype) | | NES | | |
| Mike Tyson's Punch-Out!! (prototype) | | NES | | |
| Mountain Sports (May 12, 1993 prototype) | | Sega Mega Drive | | |
| NHLPA Hockey (Catalyst prototype) | | Sega Mega Drive | | |
| Nick Faldo's Championship Golf (Sega Genesis prototype) | | Sega Mega Drive | | |
| Nuclear Rush (Prototype) | | Sega Mega Drive | | |
| Outworld 2375 AD (Catalyst prototype) | | Sega Mega Drive | | |
| PGA Tour Golf II (Catalyst prototype) | | Sega Mega Drive | | |
| Pac-Man (Unlicensed prototype) | | NES | | |
| Paperboy & RoadBlasters (May 26, 1990) | | Sega Mega Drive | | |
| Pit Fighter II (Apr 5, 1993 prototype) | | Sega Mega Drive | | |
| Police Academy (Nov 30, 1990 prototype) | | NES | | |
| Popeye in High Seas High-Jinks (prototype) | | Sega Mega Drive | | |
| Power Drive Rally (prototype) | | Atari Jaguar | | |
| Power Wing (Mar 16, 1993 prototype) | | Sega Mega Drive | | |
| Prime (Jun 17, 1994 prototype) | | Game Gear | | |
| Prime (May 17, 1994 prototype) | | Game Gear | | |
| Prince of Persia (Mega Drive prototype C) | | Sega Mega Drive | | |
| Pulseman (Apr 1994 prototype) | | Sega Mega Drive | | |
| R.B.I. Baseball '93 (Dec 22, 1992 prototype) | | Sega Mega Drive | | |
| Rampage: World Tour (Game Boy Color prototype) | | Game Boy Color | | |
| Shadows of the Wind (prototype) | | Sega Mega Drive | | |
| SimCity (NES prototype) | | NES | | |
| SimCopter 64 (Jun 16, 1997 E3 prototype) | | Nintendo 64 | | |
| Spider-Man (Aug 9, 1990 prototype) | | Sega Mega Drive | | |
| Star Mobile (Nov 29, 1991 prototype) | | Sega Mega Drive | | |
| Super Sushi Pinball (US prototype) | | NES | | |
| Takeshi no Sengoku Fuuunji (Jun 4, 1988 prototype) | | NES | | |
| Tarzan (Atari 2600 prototype) | | Atari 2600 | | |
| The Lawnmower Man (Early SNES prototype) | | SNES | | |
| The Lawnmower Man (Jun 23, 1993 prototype) | | Sega Mega Drive | | |
| The World of Sport: Golf (Feb 25, 1993 prototype) | | Game Gear | | |
| Thrill Kill (May 24, 1998 prototype) | | PlayStation | | |
| Thunder Force IV (Jun 15, 1992 prototype) | | Sega Mega Drive | | |
| Trolls on Treasure Island (May 26, 1992 prototype) | | NES | | |
| Unknown (NES CHR prototype) | | NES | | |
| Wayne Gretzky and the NHLPA All-Stars (Atari Jaguar prototype) | | Atari Jaguar | | |
| WildSnake (Genesis prototype B) | | Sega Mega Drive | | |
| Wrath of the Demon (Sep 1992 prototype) | | Sega Mega Drive | | |
| Xybots II (1994 prototype) | | Sega Mega Drive | | |
| Xybots II (Nov 16, 1993 prototype) | | Sega Mega Drive | | |
| Yogi Bear Cartoon Capers (Dec 13, 1994 prototype) | | Sega Mega Drive | | |