| World Series Baseball (Jan 6, 1994 prototype) | 6 January 1994 09:59:00 | Sega Mega Drive |
| World Series Baseball (Mar 4, 1994 prototype) | | Sega Mega Drive |
| World Series Baseball (May 27, 1994 prototype) | 28 June 1994 08:59:52 | Sega Mega Drive |
| World Series Baseball (Oct 1, 1993 prototype) | | Sega Mega Drive |
| World of Illusion starring Mickey Mouse & Donald Duck (Prototype B) | | Sega Mega Drive |
| X (Alpha) | | SNES |
| X-Men - Gamemaster's Legacy (Aug 10, 1994 prototype) | 10 August 1994 08:58:08 | Game Gear |
| X-Men - Gamemaster's Legacy (Aug 31, 1994 prototype) | 31 August 1994 04:43:52 | Game Gear |
| X-Men - Gamemaster's Legacy (Sep 6, 1994 prototype C) | 6 September 1994 17:45:54 | Game Gear |
| X-Men - Gamemaster's Legacy (Sep 6, 1994 prototype) | 6 September 1994 16:05:26 | Game Gear |
| X-Men - Mojo World (Jul 5, 1996 prototype) | 5 July 1996 12:25:28 | Game Gear |
| X-Men - Mojo World (Jun 13, 1996 prototype) | 13 June 1996 12:55:28 | Game Gear |
| X-Men - Mojo World (Jun 24, 1996 prototype) | 24 June 1996 15:36:18 | Game Gear |
| X-Men - Mojo World (Jun 25, 1996 prototype) | 25 June 1996 11:04:22 | Game Gear |
| X-Men - Mojo World (Jun 27, 1996 prototype) | 27 June 1996 18:52:56 | Game Gear |
| X-Men - Mojo World (Jun 28, 1996 prototype) | 28 June 1996 10:20:14 | Game Gear |
| X-Men - Mojo World (Jun 29, 1996 prototype) | 29 June 1996 12:59:40 | Game Gear |
| X-Men - Mojo World (Jun 5, 1996 prototype) | 5 June 1996 15:51:00 | Game Gear |
| X-Men 2 - Clone Wars (Dec 10, 1994 prototype) | 10 December 1994 04:24:32 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 11, 1994 prototype A) | 11 December 1994 19:25:06 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 11, 1994 prototype) | 11 December 1994 10:01:02 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 14, 1994 prototype) | 14 December 1994 14:23:42 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 15, 1994 prototype) | 15 December 1994 18:59:32 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 16, 1994 prototype) | 16 December 1994 17:31:16 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 17, 1994 prototype) | 17 December 1994 14:39:52 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 2, 1994 prototype) | 2 December 1994 20:57:50 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 3, 1994 prototype) | 3 December 1994 23:21:14 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 6, 1994 prototype) | 6 December 1994 06:32:54 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 7, 1994 prototype) | 7 December 1994 08:06:20 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 8, 1994 prototype) | 8 December 1994 16:46:06 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Dec 9, 1994 prototype) | 9 December 1994 04:26:58 | Sega Mega Drive |
| X-Men 2 - Clone Wars (May 10, 1994 prototype) | 11 May 1994 05:17:10 | Sega Mega Drive |
| X-Men 2 - Clone Wars (May 6, 1994 prototype) | 6 May 1994 08:39:04 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Nov 17, 1994 prototype) | 17 November 1994 06:37:46 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Nov 23, 1994 prototype) | 23 November 1994 06:40:20 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Nov 28, 1994 prototype) | 28 November 1994 12:41:32 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Nov 30, 1994 prototype) | 30 November 1994 11:59:44 | Sega Mega Drive |
| X-Men 2 - Clone Wars (Oct 18, 1994 prototype) | 18 October 1994 11:52:38 | Sega Mega Drive |
| XIII (Jul 31, 2003 02.59 prototype) | 31 July 2003 09:59:46 | PlayStation 2 |
| XIII (Jul 31, 2003 09.59 prototype) | 31 July 2003 09:59:46 | PlayStation 2 |
| Xena: Warrior Princess (Aug 10, 1999 prototype) | 10 August 1999 17:30:32 | PlayStation |
| Year at Pooh Corner (Aug 1, 1994 prototype) | 1 August 1994 15:56:30 | Sega Pico |
| Year at Pooh Corner (Aug 9, 1994 prototype) | 9 August 1994 17:55:58 | Sega Pico |
| Year at Pooh Corner (Jul 11, 1994 prototype) | 11 July 1994 21:29:32 | Sega Pico |
| Year at Pooh Corner (Jul 21, 1994 prototype) | 22 July 1994 18:51:40 | Sega Pico |
| Year at Pooh Corner (Jul 23, 1994 prototype) | 24 July 1994 07:38:20 | Sega Pico |
| Year at Pooh Corner (Jul 25, 1994 prototype) | 25 July 1994 16:11:10 | Sega Pico |
| Year at Pooh Corner (Jun 8, 1994 prototype) | 8 June 1994 21:55:08 | Sega Pico |
| Year at Pooh Corner (Prototype) | | Sega Pico |
| Young Indiana Jones - Instrument of Chaos (Dec 28, 1993 prototype A) | 28 December 1993 12:03:38 | Sega Mega Drive |
| Young Indiana Jones - Instrument of Chaos (Dec 28, 1993 prototype) | 28 December 1993 14:49:32 | Sega Mega Drive |
| Young Indiana Jones - Instrument of Chaos (Dec 29, 1993 prototype) | 29 December 1993 15:05:24 | Sega Mega Drive |
| Young Indiana Jones - Instrument of Chaos (Jan 1, 1994 prototype) | 2 January 1994 08:18:44 | Sega Mega Drive |
| Young Indiana Jones - Instrument of Chaos (Jan 26, 1994 prototype) | 26 January 1994 13:46:56 | Sega Mega Drive |
| Young Indiana Jones - Instrument of Chaos (Jan 27, 1994 prototype) | 27 January 1994 15:55:34 | Sega Mega Drive |
| Young Indiana Jones - Instrument of Chaos (Jan 28, 1994 prototype) | 28 January 1994 15:31:42 | Sega Mega Drive |
| Young Indiana Jones - Instrument of Chaos (Jan 3, 1994 prototype) | 4 January 1994 06:42:42 | Sega Mega Drive |
| Young Indiana Jones - Instrument of Chaos (Sep 23, 1993 prototype A) | 23 September 1993 06:52:28 | Sega Mega Drive |
| Zaxxon's Motherbase 2000 (Feb 10, 1995 prototype) | 10 February 1995 13:41:08 | Sega 32X |
| Zaxxon's Motherbase 2000 (Feb 21, 1995 prototype) | 21 February 1995 15:15:22 | Sega 32X |
| Zaxxon's Motherbase 2000 (Feb 23, 1995 prototype) | 23 February 1995 13:03:24 | Sega 32X |
| Zaxxon's Motherbase 2000 (Feb 27, 1995 prototype) | 27 February 1995 17:42:42 | Sega 32X |
| Zaxxon's Motherbase 2000 (Mar 10, 1995 prototype) | 10 March 1995 17:04:36 | Sega 32X |
| Zaxxon's Motherbase 2000 (Mar 15, 1995 prototype) | 15 March 1995 02:21:20 | Sega 32X |
| Zaxxon's Motherbase 2000 (Mar 3, 1995 prototype) | 3 March 1995 18:55:28 | Sega 32X |
| Zaxxon's Motherbase 2000 (Mar 31, 1995 prototype) | 31 March 1995 12:37:38 | Sega 32X |
| Zaxxon's Motherbase 2000 (Mar 6, 1995 prototype) | | Sega 32X |