| 3D Gunner (Prototype) | | Sega Master System | Shooter | ✓ |
| 3D Lemmings (Aug 23, 1995 prototype) | 23 August 1995 15:41:06 | PlayStation | Puzzle | - |
| 3D Lemmings (Aug 8, 1995 prototype) | 8 August 1995 15:36:48 | PlayStation | Puzzle | - |
| 3D Pinball: Space Cadet (Apr 26, 1995 prototype) | 26 April 1995 18:49:55 | PC | Pinball | - |
| 3D Pinball: Space Cadet (July 3, 1995 prototype) | 3 July 1995 05:30:00 | PC | Pinball | - |
| 3D Pinball: Space Cadet (June 12, 1995 prototype) | 12 June 1995 23:02:24 | PC | Pinball | - |
| 3D Pinball: Space Cadet (June 16, 1995 prototype) | 16 June 1995 20:41:19 | PC | Pinball | - |
| 3D Pinball: Space Cadet (June 27, 1995 prototype) | 27 June 1995 17:19:44 | PC | Pinball | - |
| 3D Pinball: Space Cadet (May 12, 1995 prototype) | 12 May 1995 16:36:21 | PC | Pinball | - |
| 3D Pinball: Space Cadet (May 26, 1995 prototype) | 26 May 1995 17:33:35 | PC | Pinball | - |
| 3D Pocket Pool (Prototype) | | Game Boy Color | Pool | - |
| 3D Ultra Mini Golf (Mar 17, 2007 prototype) | | Xbox 360 | Sports | - |
| 3D Ultra MiniGolf Adventures 2 (Jul 23, 2010 prototype) | 23 July 2010 | Xbox 360 | Golf | - |
| 3DO M2 Shooter Demo | | Panasonic M2 | Tech Demo | - |
| 4 Wheel Thunder (Jan 26, 2000 prototype) | 26 January 2000 16:32:38 | Dreamcast | Racing | - |
| 4 Wheel Thunder (Jan 29, 2000 prototype) | 29 January 2000 18:00:12 | Dreamcast | Racing | - |
| 4 Wheel Thunder (Mar 31, 2000 prototype) | 31 March 2000 19:36:08 | Dreamcast | Racing | - |
| 4 Wheel Thunder (Nov 5, 1999 prototype) | 5 November 1999 13:57:00 | Dreamcast | Racing | - |
| 4 in 1 (Feb 19, 1987 prototype) | 19 February 1987 | Atari 2600 | Various | ✓ |
| 40 Winks (Oct 7, 1999 prototype) | 7 October 1999 11:30:42 | Nintendo 64 | Platform | ✓ |
| 4x4 Evolution (Jan 9, 2001 prototype) | 9 January 2001 11:47:12 | Dreamcast | Racing | ✓ |
| 500 Years After (Mar 1, 1993 prototype) | 1 March 1993 | Philips CD-i | FMV | - |
| 64DD IPL (US Prototype) | | | Development | - |
| 64DD IPL Disk (v1.0) | | Nintendo 64DD | Development | - |
| 64DD IPL Disk (v1.1) | | Nintendo 64DD | Development | - |
| 64DD TOOL IPL (Development Drive) | | | Development | - |
| 6GUN (May 31, 2005 prototype) | 31 May 2005 22:28:48 | PlayStation 2 | Third person shooter | ✓ |
| 7 Sins (Sep 29, 2004 prototype) | 29 September 2004 | PlayStation 2 | Life simulation game | - |
| 7th Guest (Feb 4, 1994 prototype) | 4 February 1994 12:05:41 | Philips CD-i | First-Person Adventure | - |
| 8 Kings (Aug 7, 2003 prototype) | 7 August 2003 | N-Gage | | ✓ |
| 8 Kings (Jun 5, 2003 prototype) | 5 June 2003 | N-Gage | | ✓ |
| 8 Kings (May 9, 2003 prototype) | 9 May 2003 | N-Gage | | ✓ |
| 8 Kings (Nov 18, 2003 prototype) | 18 November 2003 | PC | | ✓ |
| 8 Kings (Oct 23, 2003 prototype) | 23 October 2003 | N-Gage | | ✓ |
| 8 in 1 (Nov 16, 1992 prototype) | | Atari 2600 | Compilation | ✓ |
| 8Ball Allstars (Aug 15, 2008 Pool prototype) | 15 August 2008 15:55:36 | Nintendo DS | Pool | - |
| 8Ball Allstars (Feb 11, 2008 prototype) | 11 February 2008 21:06:18 | Nintendo DS | Pool | - |
| 8Ball Allstars (Feb 26, 2008 prototype) | 26 February 2008 12:43:36 | Nintendo DS | Pool | - |
| 90 Minutes: European Prime Goal (prototype) | | SNES | Sports | - |
| 90 Minutes: Sega Championship Football (Sep 18, 2001 prototype) | 18 September 2001 | Dreamcast | Sports - Football | - |
| A Boy and His Blob (Jul 21, 2005 prototype) | 21 July 2005 | Nintendo DS | Puzzle | ✓ |
| A Boy and His Blob (May 16, 2005 prototype) | 16 May 2005 | Nintendo DS | Puzzle | ✓ |
| A Bug's Life (Nov 18, 1998 prototype) | 18 November 1998 | PlayStation | Platform | - |
| A Kingdom for Keflings (Apr 14, 2009 prototype) | 14 April 2009 | Xbox 360 | Strategy | - |
| A Kingdom for Keflings (Aug 30, 2008 prototype) | 30 August 2008 | Xbox 360 | Strategy, Simulation | - |
| A Kingdom for Keflings (Oct 29, 2008 prototype) | 29 October 2008 | Xbox 360 | Strategy | - |
| A Night in Nylon City (Oct 28, 1994 prototype) | 28 October 1994 | Philips CD-i | FMV | - |
| A Week of Garfield (Prototype) | | NES | Platformer | - |
| A Week of Garfield (Ver 0.9 prototype) | | NES | Platformer | - |
| A World of Keflings (Feb 27, 2010 prototype) | 27 February 2010 00:24:23 | Xbox 360 | Strategy | - |