| Shining Force II (Jul 8, 1994 prototype) | 8 July 1994 16:33:26 | Game Gear |
| Shining Force II (Jun 27, 1994 prototype) | 28 June 1994 12:42:02 | Game Gear |
| Shining Force II (Jun 30, 1994 prototype) | 1 July 1994 11:00:38 | Sega Mega Drive |
| Shining Force II (Jun 7, 1994 prototype) | 8 June 1994 06:57:24 | Sega Mega Drive |
| Shining Force II (May 30, 1994 prototype) | 31 December 1979 23:56:50 | Game Gear |
| Ship (demo) | 24 September 2007 | Sega Mega Drive |
| Slam - Shaq vs. the Legends prototype | | Sega Mega Drive |
| Slam N' Jam 96 (Feb 1, 1996 prototype) | 6 February 1996 17:23:55 | Sega Saturn |
| Snoopy no Gakugeikai (Prototype) | | Sega Pico |
| Sonic & Knuckles (Jun 10, 1994 prototype) | 10 June 1994 05:49:40 | Sega Mega Drive |
| Sonic & Knuckles (Jun 12, 1994 prototype) | 12 June 1994 16:27:30 | Sega Mega Drive |
| Sonic & Knuckles (Jun 18, 1994 prototype) | 18 June 1994 | Sega Mega Drive |
| Sonic & Knuckles (Jun 19, 1994 prototype) | 19 June 1994 | Sega Mega Drive |
| Sonic & Knuckles (Jun 6, 1994 prototype) | 6 June 1994 08:02:22 | Sega Mega Drive |
| Sonic & Knuckles (Jun 8, 1994 prototype) | 8 June 1994 03:03:54 | Sega Mega Drive |
| Sonic & Knuckles (May 25, 1994 prototype) | 25 May 1994 13:28:36 | Sega Mega Drive |
| Sonic 2 & Knuckles (Jun 10, 1994 prototype) | 10 June 1994 01:11:06 | Sega Mega Drive |
| Sonic 2 & Knuckles (Jun 12, 1994 prototype) | 12 June 1994 16:18:30 | Sega Mega Drive |
| Sonic 2 & Knuckles (Jun 18, 1994 prototype) | 18 June 1994 | Sega Mega Drive |
| Sonic 2 & Knuckles (Jun 5, 1994 prototype) | 5 June 1994 20:25:30 | Sega Mega Drive |
| Sonic 2 & Knuckles (Jun 8, 1994 prototype) | 8 June 1994 01:35:46 | Sega Mega Drive |
| Sonic 2 & Knuckles (May 24, 1994 prototype) | 27 May 1994 08:46:32 | Sega Mega Drive |
| Sonic 3C (Apr 8, 1994 prototype) | 8 April 1994 | Sega Mega Drive |
| Sonic 3C (May 17, 1994 prototype) | 17 May 1994 15:08:10 | Sega Mega Drive |
| Sonic 3D Blast (Aug 14, 1996 prototype) | 15 August 1996 05:55:24 | Sega Mega Drive |
| Sonic 3D Blast (Aug 19, 1996 prototype) | 19 August 1996 17:49:06 | Sega Mega Drive |
| Sonic 3D Blast (Aug 25, 1996 prototype) | 26 August 1996 13:46:08 | Sega Mega Drive |
| Sonic 3D Blast (Aug 30, 1996 prototype) | 31 August 1996 06:19:56 | Sega Mega Drive |
| Sonic 3D Blast (Aug 31, 1996 prototype) | 3 September 1996 08:07:10 | Sega Mega Drive |
| Sonic 3D Blast (Jul 3, 1996 prototype) | 3 July 1996 11:58:28 | Sega Mega Drive |
| Sonic 3D Blast (Oct 8, 1996 prototype) | 8 October 1996 16:54:15 | Sega Saturn |
| Sonic 3D Blast (Sep 11, 1996 prototype) | 11 September 1996 09:49:18 | Sega Mega Drive |
| Sonic 3D Blast (Sep 4, 1996 prototype) | 4 September 1996 10:01:30 | Sega Mega Drive |
| Sonic Adventure 2 (May 21, 2001 prototype) | 21 May 2001 14:15:00 | Dreamcast |
| Sonic Adventure 2 (May 7, 2001 prototype) | 7 May 2001 08:00:00 | Dreamcast |
| Sonic Adventure 2: Battle (Review prototype) | | Nintendo GameCube |
| Sonic Adventure DX (Preview prototype) | | Nintendo GameCube |
| Sonic Adventure DX (Review prototype) | | Nintendo GameCube |
| Sonic Blast (Aug 21, 1996 prototype) | 22 August 1996 07:37:42 | Game Gear |
| Sonic Blast (Aug 27, 1996 prototype) | 28 August 1996 09:13:02 | Game Gear |
| Sonic Blast (Aug 6, 1996 prototype) | 6 August 1996 16:36:30 | Game Gear |
| Sonic Blast (Jul 4, 1996 prototype) | 4 July 1996 16:13:52 | Game Gear |
| Sonic Blast (May 31, 1996 prototype) | 31 May 1996 11:49:44 | Game Gear |
| Sonic Blast (Sep 2, 1996 prototype) | 2 September 1996 15:46:48 | Game Gear |
| Sonic Blast (Sep 7, 1996 prototype) | 7 September 1996 16:01:42 | Game Gear |
| Sonic Chaos (Jul 13, 1993 prototype) | 13 July 1993 | Sega Master System |
| Sonic Chaos (Jun 30, 1993 prototype) | 30 June 1993 | Sega Master System |
| Sonic Chaos (May 17, 1993 prototype) | 17 May 1993 | Game Gear |
| Sonic Heroes (Nov 18, 2003 prototype) | 18 November 2003 | Nintendo GameCube |
| Sonic Heroes (Oct 8, 2003 prototype) | 8 October 2003 | Nintendo GameCube |