| Bubble and Squeak (PAL prototype) | | Sega Mega Drive | Platform | - |
| Bubsy 3D (Mar 13, 1997 prototype) | 13 March 1997 11:15:18 | PlayStation | Platformer | - |
| Bubsy in Claws Encounters of the Furred Kind (Prototype A) | | SNES | Platformer | - |
| Bubsy in Claws Encounters of the Furred Kind (Prototype B) | | SNES | Platformer | - |
| Bud Redhead: The Time Chase (test version) | | PC | Platformer | - |
| Budokan - The Martial Spirit (Sep 25, 1990 prototype) | 25 September 1990 19:09:38 | Sega Mega Drive | Sports | - |
| Buffy the Vampire Slayer (Apr 2, 2002 prototype) | 2 April 2002 15:50:28 | Xbox | Beat-Em-Up | - |
| Buffy the Vampire Slayer (Jun 25, 2002 prototype) | 25 June 2002 23:49:50 | Xbox | Beat-Em-Up | - |
| Buffy the Vampire Slayer: Chaos Bleeds (Jul 4, 2003 prototype) | 4 July 2003 02:18:06 | PlayStation 2 | Beat-em-Up | - |
| Bug Bash (Mar 23, 2007 prototype) | 23 March 2007 | Xbox 360 | Arcade | ✓ |
| Bug Blasters: The Exterminators (Jan 23, 1995 prototype) | 23 January 1995 16:12:35 | Sega CD | Shoot-'em-Up | ✓ |
| Bug Too! (Aug 12, 1996 prototype) | 12 August 1996 15:53:30 | Sega Saturn | Platformer | - |
| Bug Too! (Nov 8, 1996 prototype) | 8 November 1996 01:14:22 | Sega Saturn | Platformer | - |
| Bug! (Jun 14, 1995 prototype) | 14 June 1995 15:48:47 | Sega Saturn | Platformer | - |
| Bugs Bunny & Taz: Time Busters (Aug 13, 2000 prototype) | 13 August 2000 22:42:56 | PlayStation | Platformer | - |
| Bugs Bunny & Taz: Time Busters (Aug 5, 2000 prototype) | 5 August 2000 19:26:12 | PlayStation | Platformer | - |
| Bugs Bunny (Aug 4, 1983 prototype) | 4 August 1983 | Atari 2600 | | ✓ |
| Bugs Bunny (Jun 20, 1983 prototype) | | Atari 2600 | | ✓ |
| Build Database PS3 (A prototype) | | PlayStation 3 | | ✓ |
| Build Database PS3 (B prototype) | | PlayStation 3 | | ✓ |
| Bujingai: The Forsaken City (Nov 2, 2003 prototype) | 2 November 2003 | PlayStation 2 | | - |
| Buku Sudoku (Dec 27, 2007 prototype) | 27 December 2007 | Xbox 360 | Puzzle | - |
| Bullet Soul (Sep 14, 2010 prototype) | 14 September 2010 06:28:38 | Xbox 360 | Action | - |
| Bullet Witch (Jan 9, 2007 Prototype) | 9 January 2007 22:30:17 | Xbox 360 | Third Person Shooter | - |
| Bullet Witch (Nov 1, 2006 Prototype) | 1 November 2006 23:41:04 | Xbox 360 | Third Person Shooter | - |
| Bulletstorm (Apr 8, 2010 prototype) | 8 April 2010 23:36:38 | Xbox 360 | First Person Shooter | - |
| Bulletstorm (Dec 20, 2010 Prototype) | 20 December 2010 15:53:14 | Xbox 360 | FPS | - |
| Bulletstorm (May 15, 2010 prototype) | 15 May 2010 00:27:05 | Xbox 360 | First Person Shooter | - |
| Bully: Scholarship Edition (Debug Build) | | Nintendo Wii | Action-Adventure | - |
| Bully: Scholarship Edition (Jan 11, 2008 prototype) | 11 January 2008 | Nintendo Wii | Action-Adventure | - |
| Bully: Scholarship Edition (Late Build) | | Nintendo Wii | Action-Adventure | - |
| Bully: Scholarship Edition (Nov 13, 2007 prototype) | 13 November 2007 | Nintendo Wii | Action-Adventure | - |
| Bully: Scholarship Edition (Nov 16, 2007 prototype) | 16 November 2007 | Nintendo Wii | Action-Adventure | - |
| BurgerTime: World Tour (Jul 7, 2011 prototype) | 7 July 2011 | Xbox 360 | Action | - |
| Burn (Jan 12, 2012 prototype) | 12 January 2012 16:59:15 | Xbox 360 | Action | ✓ |
| Burn (Jan 24, 2012 prototype) | 24 January 2012 16:48:57 | Xbox 360 | Action | ✓ |
| Burn Out (Prototype) | 7 January 1995 | Atari Jaguar | Racing | - |
| Burning Fists: Force Striker (Dec 7, 1993 prototype) | 7 December 1993 09:12:08 | Sega CD | Action | ✓ |
| Burning Rangers (Dec 1, 1997 prototype) | | Sega Saturn | Action | - |
| Burning Rangers (Jan 3, 1998 prototype) | | Sega Saturn | Action | - |
| Burnout (Jan 3, 2002 prototype) | 3 January 2002 | PlayStation 2 | Racing | - |
| Burnout (Mar 21, 2002 prototype) | 21 March 2002 | Xbox | Racing | - |
| Burnout (Mar 6, 2002 prototype) | 6 March 2002 | Nintendo GameCube | Racing | - |
| Burnout (Oct 1, 2001 demo) | 1 October 2001 04:35:12 | PlayStation 2 | Racing | - |
| Burnout (September 12, 2001 prototype) | 12 September 2001 17:16:54 | PlayStation 2 | Racing | - |
| Burnout 2: Point of Impact (Aug 31, 2002 22.44.32 prototype) | 31 August 2002 22:44:32 | PlayStation 2 | Racing | - |
| Burnout 2: Point of Impact (Aug 31, 2002 prototype) | 31 August 2002 | PlayStation 2 | | - |
| Burnout 2: Point of Impact (Aug 5, 2002 prototype) | 5 August 2002 18:20:32 | PlayStation 2 | Racing | - |
| Burnout 2: Point of Impact (Aug 6, 2002 demo) | 6 August 2002 13:00:34 | PlayStation 2 | | - |
| Burnout 2: Point of Impact (Jul 27, 2002 prototype) | 27 July 2002 18:53:57 | PlayStation 2 | Racing | - |