| Cutthroat Island (Sep 16, 1995 prototype) | 16 September 1995 | Game Gear | Action | - |
| Cutthroat Island (prototype) | | SNES | Platformer | - |
| Cy Girls (Oct 29, 2003 prototype) | 29 October 2003 13:27:15 | PlayStation 2 | Action Adventure | - |
| Cyber Police ESWAT (Prototype A) | | Sega Master System | Action | - |
| Cyber Police ESWAT (Prototype B) | | Sega Master System | Action | - |
| Cyber Police ESWAT (Prototype C) | | Sega Master System | Action | - |
| Cyber Speedway (Jun 26, 1995 prototype) | 26 June 1995 14:30:50 | Sega Saturn | Racing | - |
| Cyber Troopers Virtual-On Force (Sep 13, 2010 prototype) | 13 September 2010 | Xbox 360 | Action | - |
| Cyber Troopers Virtual-On Oratorio Tangram (Dec 9, 1999 prototype) | 9 December 1999 13:30:35 | Dreamcast | Action | - |
| Cyber Troopers Virtual-On Oratorio Tangram (Mar 31, 2009 prototype) | 31 March 2009 | Xbox 360 | Action | - |
| Cybermorph (Early prototype) | 23 August 1993 | Atari Jaguar | Shooter | - |
| Cybernator (Nov 1992 prototype) | November 1992 | SNES | Run and gun | - |
| Cyborg 009 (Prototype) | | SNES | Run and gun | - |
| Cyborg Hunter (Prototype) | | Sega Master System | Arcade | - |
| D (Jan 15, 1996 prototype) | 15 January 1996 08:38:52 | PlayStation | Adventure | - |
| D&Co (Prototype) | | Nintendo DS | | - |
| DJ Hero (Jul 20, 2009 prototype) | 20 July 2009 22:55:14 | Xbox 360 | Rhythm | - |
| DJ Hero (Jul 28, 2009 prototype) | 28 July 2009 | Xbox 360 | Music | - |
| DJ Hero 2 (Jul 6, 2010 prototype) | 6 July 2010 | Xbox 360 | Music, Rhythm | - |
| DK King of Swing (iQue prototype) | | Game Boy Advance | Platformer | - |
| DOA2: Hardcore (Oct 1, 2000 prototype) | 1 October 2000 16:57:12 | PlayStation 2 | Fighting | - |
| DOOM II (Jan 6, 2010 prototype) | 6 January 2010 20:47:30 | Xbox 360 | First Person Shooter | - |
| DOOM II (May 5, 2010 prototype) | 5 May 2010 | Xbox 360 | First Person Shooter | - |
| DSP-1 Tech Demo | | SNES | Tech Demo | ✓ |
| Daffy Duck in Hollywood (ESB Prototype) | | Sega Mega Drive | Platform | - |
| Daffy Duck: The Marvin Missions (Prototype) | | SNES | Platformer | - |
| Dai Senryaku VII: Modern Military Tactics (Oct 11, 2004 prototype) | 11 October 2004 18:02:26 | Xbox | Turn-Based Strategy | - |
| Daikatana (Apr 19, 2000 prototype) | 19 April 2000 | Game Boy Color | Role Playing | - |
| Dakar 2 (Jan 27, 2003 prototype) | 27 January 2003 16:44:14 | PlayStation 2 | Racing | - |
| Dakar 2 (Nov 28, 2002 prototype) | 28 November 2002 14:54:28 | PlayStation 2 | Racing | - |
| Damnation (Apr 20, 2009 prototype) | 20 April 2009 | PlayStation 3 | Third-person shooter | - |
| Damnation (Jan 6, 2009 prototype) | 6 January 2009 | PlayStation 3 | Third-person shooter | - |
| Dance Central (Aug 10, 2010 Takehome Beta) | 10 August 2010 | Xbox 360 | Music, Rhythm | - |
| Dance Central (Jun 7, 2010 prototype) | 7 June 2010 21:25:01 | Xbox 360 | Music, Rhythm | - |
| Dance Central 2 (Jul 25, 2011 Takehome Beta) | 25 July 2011 | Xbox 360 | Music, Rhythm | - |
| Dance Central 3 (Aug 29, 2012 prototype) | 29 August 2012 18:34:44 | Xbox 360 | Rhythm | - |
| Dance Central 3 (Sep 16, 2012 prototype) | 16 September 2012 07:38:40 | Xbox 360 | Rhythm | - |
| Dance Dance Revolution (Dec 8, 2000 prototype) | 8 December 2000 15:02:34 | PlayStation | Rhythm | - |
| Dance Dance Revolution (Sep 1, 2010 prototype) | 1 September 2010 10:49:51 | Nintendo Wii | Rhythm | - |
| Dance Dance Revolution Extreme (Jul 12, 2004 prototype) | 12 July 2004 18:12:10 | PlayStation 2 | Music, Exercise | - |
| Dance Dance Revolution Extreme (May 10, 2004 prototype) | 10 May 2004 17:07:36 | PlayStation 2 | Music, Exercise | - |
| Dance Dance Revolution Extreme 2 (May 10, 2005 prototype) | 10 May 2005 22:32:06 | PlayStation 2 | Music, Exercise | - |
| Dance Dance Revolution Ultramix (Aug 12, 2003 prototype) | 12 August 2003 23:33:04 | Xbox | Music, Exercise | - |
| Dance Dance Revolution Ultramix 2 (Sep 7, 2004 prototype) | 7 September 2004 21:41:32 | Xbox | Music, Exercise | - |
| Dance Dance Revolution Ultramix 3 (May 14, 2005 prototype) | 14 May 2005 05:32:38 | Xbox | Music, Exercise | - |
| Dance Dance Revolution Ultramix 3 (Sep 3, 2005 prototype) | 3 September 2005 01:18:23 | Xbox | Music, Exercise | - |
| Dance Dance Revolution Universe 3 (Aug 21, 2008 prototype) | 21 August 2008 | Xbox 360 | Music | - |
| Dance Dance Revolution X (Jul 10, 2008 prototype) | 10 July 2008 11:33:38 | PlayStation 2 | Music, Exercise | - |
| Dance Dance Revolution: Disney Mix (Jun 8, 2001 prototype) | 8 June 2001 13:47:32 | PlayStation | Rhythm | - |
| Dance Factory (Feb 22, 2006 prototype) | 22 February 2006 12:32:52 | PlayStation 2 | Rhythm | - |