| Game Room (Mar 5, 2010 03.17 prototype) | 5 March 2010 | Xbox 360 | Compilation | - |
| Game Room (Mar 5, 2010 03.20 prototype) | 5 March 2010 | Xbox 360 | Compilation | - |
| Game Room (Oct 14, 2010 prototype) | 14 October 2010 | Xbox 360 | Compilation | - |
| Ganbare Goemon 3: Shishi Juurokubei no Karakuri Manjigatame (Oct 24, 1994 prototype) | 24 October 1994 | SNES | Adventure | - |
| Gangs of London (Jun 5, 2006 prototype) | 5 June 2006 15:43:17 | PlayStation Portable | Action | - |
| Garfield (Jun 21, 1984 prototype) | 21 June 1984 | Atari 2600 | | ✓ |
| Garfield Kart (1st Playable Version V2 prototype) | | Nintendo 3DS | Racing | - |
| Garfield Kart (1st Playable Version prototype) | | Nintendo 3DS | Racing | - |
| Garfield Kart (Age Rating prototype) | | Nintendo 3DS | Racing | - |
| Garfield Kart (Alpha 1802 prototype) | | Nintendo 3DS | Racing | - |
| Garfield Kart (Apr 13, 2015 prototype) | 13 April 2015 | Nintendo 3DS | Racing | - |
| Garfield Kart (Apr 4, 2015 prototype) | 4 April 2015 | Nintendo 3DS | Racing | - |
| Garfield Kart (GDC prototype) | | Nintendo 3DS | Racing | - |
| Garfield Kart (Mar 23, 2015 prototype) | 23 March 2015 | Nintendo 3DS | Racing | - |
| Gargoyles (Jul 19, 1994 prototype) | 19 July 1994 | SNES | Action | ✓ |
| Gauntlet (100% Complete Nintendo DS prototype) | | Nintendo DS | Action | ✓ |
| Gauntlet (CENSOR prototype) | | Sega Mega Drive | Role playing | - |
| Gauntlet (Nintendo DS demo) | | Nintendo DS | Action | - |
| Gauntlet (Nov 9, 2005 prototype) | 9 November 2005 | Xbox 360 | Arcade | - |
| Gauntlet (Unknown prototype) | | Xbox 360 | Action | - |
| Gauntlet II (Prototype) | | Game Boy | | - |
| Gauntlet Legends (Apr 19, 2000 prototype) | 19 April 2000 11:40:44 | Dreamcast | Action | - |
| Gauntlet Legends (Feb 18, 2000 prototype) | 18 February 2000 14:34:50 | Dreamcast | Action-adventure | - |
| Gauntlet Legends (Jan 17, 2000 prototype) | 17 January 2000 03:47:16 | PlayStation | Role Playing | - |
| Gauntlet Legends (May 26, 2000 prototype) | 26 May 2000 12:24:24 | Dreamcast | Role playing | - |
| Gauntlet: Dark Legacy (Feb 6, 2001 prototype) | 6 February 2001 13:18:37 | PlayStation 2 | Action RPG | - |
| Gauntlet: Dark Legacy (Mar 19, 2001 build) | 19 March 2001 | PlayStation 2 | | - |
| Gears of War (Jan 22, 2006 prototype) | 22 January 2006 | Xbox 360 | Third-person shooter | - |
| Gears of War (Jan 22, 2007 prototype) | 22 January 2007 16:23:45 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Nov 11, 2006 prototype) | 11 November 2006 22:01:35 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Oct 2, 2006 prototype) | 2 October 2006 07:49:27 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Sep 14, 2006 prototype) | 14 September 2006 00:00:00 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Sep 21, 2006 prototype) | 21 September 2006 00:00:00 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Sep 23, 2006 prototype) | 23 September 2006 11:34:59 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Sep 25, 2006 prototype) | 25 September 2006 09:09:43 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Sep 27, 2006 prototype) | 27 September 2006 09:15:15 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Sep 29, 2006 12.46 prototype) | 29 September 2006 12:46:14 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Sep 29, 2006 22.09 prototype) | 29 September 2006 22:09:16 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Sep 3, 2006 prototype) | 3 September 2006 | Xbox 360 | Third-person shooter | - |
| Gears of War (Sep 4, 2006 prototype) | 4 September 2006 00:19:53 | Xbox 360 | Third Person Shooter | - |
| Gears of War (Sep 6, 2006 prototype) | 6 September 2006 | Xbox 360 | Third Person Shooter | - |
| Gears of War 2 (Apr 29, 2008 prototype) | 29 April 2008 19:09:42 | Xbox 360 | Third Person Shooter | - |
| Gears of War 2 (Apr 29, 2010 TU6 prototype) | 29 April 2010 | Xbox 360 | Action, Shooter | - |
| Gears of War 2 (Apr 4, 2008 prototype) | 4 April 2008 06:46:56 | Xbox 360 | Third Person Shooter | - |
| Gears of War 2 (DLC Combustible Multiplayer Map Pack prototype) | | Xbox 360 | Action, Shooter | - |
| Gears of War 2 (Dec 2, 2008 2 Test DLCs + DLC Combustible Multiplayer Map Pack prototype) | 2 December 2008 11:21:00 | Xbox 360 | Action, Shooter | - |
| Gears of War 2 (Feb 1, 2008 prototype) | 1 February 2008 | Xbox 360 | Third Person Shooter | - |
| Gears of War 2 (Feb 12, 2008 prototype) | 12 February 2008 23:22:56 | Xbox 360 | First Person Shooter | - |
| Gears of War 2 (Feb 20, 2009 DLC Snowblind Map Pack prototype) | 20 February 2009 05:11:00 | Xbox 360 | Action, Shooter | - |
| Gears of War 2 (Jan 6, 2009 TU2 prototype) | 6 January 2009 17:17:00 | Xbox 360 | Action, Shooter | - |