| Bottom of the 9th '97 (Jul 25, 1997 prototype) | 25 July 1997 00:00:00 | PlayStation | Sports - Baseball | - |
| Bottom of the 9th (Jul 10, 1996 prototype) | 10 July 1996 15:49:46 | Sega Saturn | Sports - Baseball | - |
| Bouncin' Baby Bunnies (prototype) | | Atari 2600 | | ✓ |
| Bounty Arms (Jan 30, 1995 prototype) | 30 January 1995 | PlayStation | Action | ✓ |
| Bounty Sword (May 16, 1995 prototype) | 16 May 1995 | SNES | Role Playing | - |
| Boxing Legends of the Ring (prototype) | | SNES | Sports - Boxing | - |
| Braid (Apr 21, 2008 prototype) | 21 April 2008 | Xbox 360 | Action | - |
| Braid (Jun 24, 2008 prototype) | 24 June 2008 | Xbox 360 | Puzzle, Platformer | - |
| Brain Challenge (Dec 7, 2007 prototype) | 7 December 2007 | Xbox 360 | Edutainment | - |
| Brain Dead 13 (Jun 11, 1996 prototype) | 11 June 1996 | Philips CD-i | FMV | ✓ |
| Bram Stoker's Dracula (SNES prototype) | | SNES | Platformer | - |
| Brave Fencer Musashi (Aug 31, 1998 prototype) | 31 August 1998 12:56:08 | PlayStation | Action RPG | - |
| Brave Fencer Musashi (Sep 8, 1998 prototype) | 8 September 1998 12:00:00 | PlayStation | Action RPG | - |
| Brave: A Warrior's Tale (Apr 3, 2009 prototype) | 3 April 2009 | Nintendo Wii | Action-adventure | - |
| Brave: A Warrior's Tale (Feb 19, 2009 prototype) | 19 February 2009 | Xbox 360 | Action-adventure | - |
| Brave: A Warrior's Tale (Sep 30, 2008 prototype) | 30 September 2008 | Xbox 360 | Action-adventure | - |
| Brave: The Search for Spirit Dancer (May 9, 2005 prototype) | 9 May 2005 21:43:27 | PlayStation 2 | Platforming | - |
| Brawl (Jul 10, 2011 prototype) | 10 July 2011 | PlayStation 3 | | ✓ |
| Breach (May 12, 2010 prototype) | 12 May 2010 | Xbox 360 | First Person Tactical | - |
| Breach (Prototype) | | Sega Mega Drive | Action | ✓ |
| BreakThru! (Game Gear Prototype) | | Game Gear | Puzzle | ✓ |
| Breakdown (Dec 14, 2003 prototype) | 14 December 2003 07:51:37 | Xbox | First-Person Shooter, Action-Adventure | - |
| Breakneck (Feb 5, 1998 prototype) | 5 February 1998 01:01:06 | PlayStation | Racing | ✓ |
| Breakout 2000 (Prototype) | | Atari Jaguar | Puzzle | - |
| Breath of Fire II (Prototype) | | SNES | RPG | - |
| Breath of Fire IV (May 1, 2000 E3 demo) | 1 May 2000 | PlayStation | Role-playing | - |
| Breath of Fire V: Dragon Quarter (Oct 24, 2002 prototype) | 24 October 2002 10:33:54 | PlayStation 2 | Role-playing | - |
| Brett Hull Hockey (Prototype) | | Atari Jaguar | Sports | ✓ |
| Brett Hull NHL Hockey (Prototype) | | Atari Jaguar CD | Sports - Hockey | - |
| Broken Helix (Apr 15, 1997 prototype) | 15 April 1997 22:44:24 | PlayStation | Action Adventure | - |
| Broken Helix (Apr 22, 1997 prototype) | 22 April 1997 20:20:08 | PlayStation | Action Adventure | - |
| Broken Helix (Jan 13, 1997 prototype) | 13 January 1997 13:12:18 | PlayStation | Action Adventure | - |
| Broken Helix (Oct 7, 1996 prototype) | 7 October 1996 15:08:06 | PlayStation | Action Adventure | - |
| Broken Sword: The Shadow of the Templars (Oct 1, 1997 prototype) | 1 October 1997 16:27:10 | PlayStation | Action Adventure | - |
| Brothers in Arms: Road to Hill 30 (Feb 15, 2005 prototype) | 15 February 2005 16:29:48 | Xbox | First-person shooter | - |
| Brothers in Arms: Road to Hill 30 (Nov 18, 2004 prototype) | 18 November 2004 03:15:24 | Xbox | First-person shooter | - |
| Brothers: A Tale of Two Sons (Apr 2, 2013 prototype) | 2 April 2013 | Xbox 360 | Action Adventure | - |
| Brothers: A Tale of Two Sons (Apr 3, 2013 prototype) | 3 April 2013 | Xbox 360 | Action Adventure | - |
| Brunswick Pro Bowling (April 2nd, 2007 prototype) | 2 April 2007 14:42:46 | PlayStation 2 | Sports | - |
| Brutal: Paws of Fury (SNES prototype) | | SNES | Fighting | - |
| Brute Force (Apr 10, 2003 prototype) | 10 April 2003 00:02:08 | Xbox | Third-Person Shooter | - |
| Bubble Bobble (Game Gear Prototype) | | Game Gear | Puzzle | - |
| Bubble Bobble II (Dec 13, 1993 prototype) | 13 December 1993 15:50:00 | Arcade | Puzzle | - |
| Bubble Bobble II (Jan 30, 1997 prototype) | 30 January 1997 00:30:38 | PlayStation | Puzzle | ✓ |
| Bubble Bobble Neo! (Apr 9, 2009 prototype) | 9 April 2009 03:52:46 | Xbox 360 | Puzzle | - |
| Bubble Bobble Neo! (Jun 10, 2009 prototype) | 10 June 2009 | Xbox 360 | Puzzle, Platformer | - |
| Bubble Game (Apr 22, 2008 prototype) | 22 April 2008 | Xbox 360 | Puzzle | - |
| Bubble Ghost (Prototype) | | Game Boy | Puzzle | - |
| Bubble and Squeak (PAL prototype) | | Sega Mega Drive | Platform | - |
| Bubsy 3D (Mar 13, 1997 prototype) | 13 March 1997 11:15:18 | PlayStation | Platformer | - |