| NBA Action Starring David Robinson (Feb 28, 1994 prototype) | 28 February 1994 07:12:40 | Game Gear |
| NBA Action Starring David Robinson (Feb 3, 1994 prototype) | 3 February 1994 15:52:04 | Game Gear |
| NBA Action Starring David Robinson (Feb 6, 1994 prototype) | 6 February 1994 12:28:42 | Game Gear |
| NBA Action Starring David Robinson (Feb 8, 1994 prototype) | 8 February 1994 19:27:26 | Game Gear |
| NBA Action Starring David Robinson (Jan 10, 1994 prototype) | 10 January 1994 11:51:58 | Game Gear |
| NBA Action Starring David Robinson (Jan 24, 1994 prototype) | 24 January 1994 12:50:06 | Game Gear |
| NBA Action Starring David Robinson (Jan 29, 1994 prototype) | 29 January 1994 16:56:34 | Game Gear |
| NBA Action Starring David Robinson (Jan 4, 1994 prototype) | 4 January 1994 16:18:44 | Game Gear |
| NBA Action Starring David Robinson (Jan 6, 1994 prototype) | 6 January 1994 17:24:38 | Game Gear |
| NBA Action Starring David Robinson (Mar 1, 1994 prototype) | 1 March 1994 11:05:20 | Game Gear |
| NBA Action Starring David Robinson (Mar 11, 1994 prototype) | 15 March 1994 08:26:40 | Game Gear |
| NBA Action Starring David Robinson (Mar 2, 1994 prototype) | 2 March 1994 11:24:24 | Game Gear |
| NBA Action Starring David Robinson (Mar 3, 1994 prototype) | 3 March 1994 03:38:44 | Game Gear |
| NBA Action Starring David Robinson (Mar 4, 1994 prototype F) | 4 March 1994 20:51:52 | Game Gear |
| NBA Action Starring David Robinson (Mar 4, 1994 prototype) | 4 March 1994 02:14:44 | Game Gear |
| NBA Action Starring David Robinson (Mar 5, 1994 prototype) | 5 March 1994 22:51:26 | Game Gear |
| NBA Action Starring David Robinson (Mar 8, 1994 prototype) | 8 March 1994 19:40:58 | Game Gear |
| NBA Action Starring David Robinson (Nov 28, 1993 prototype) | 28 November 1993 19:17:10 | Game Gear |
| NFL '95 (Aug 1, 1994 prototype) | 2 August 1994 11:37:48 | Sega Mega Drive |
| NFL '95 (Aug 10, 1994 prototype) | 10 August 1994 17:14:44 | Sega Mega Drive |
| NFL '95 (Aug 12, 1994 prototype) | 12 August 1994 13:31:04 | Sega Mega Drive |
| NFL '95 (Aug 17, 1994 prototype B) | 17 August 1994 17:44:02 | Sega Mega Drive |
| NFL '95 (Aug 17, 1994 prototype) | 17 August 1994 02:09:46 | Sega Mega Drive |
| NFL '95 (Aug 22, 1994 prototype) | 22 August 1994 12:19:42 | Sega Mega Drive |
| NFL '95 (Aug 30, 1994 prototype) | 30 August 1994 14:15:16 | Sega Mega Drive |
| NFL '95 (Aug 31, 1994 prototype) | 31 August 1994 05:41:58 | Sega Mega Drive |
| NFL '95 (Aug 5, 1994 prototype) | 5 August 1994 07:53:50 | Sega Mega Drive |
| NFL '95 (Sep 1, 1994 prototype) | 1 September 1994 03:50:18 | Sega Mega Drive |
| NFL '95 (Sep 11, 1994 prototype B) | 11 September 1994 20:24:26 | Sega Mega Drive |
| NFL '95 (Sep 11, 1994 prototype) | 11 September 1994 09:38:52 | Sega Mega Drive |
| NFL '95 (Sep 2, 1994 prototype) | 4 September 1994 06:15:04 | Sega Mega Drive |
| NFL '95 (Sep 4, 1994 prototype) | 4 September 1994 09:57:00 | Sega Mega Drive |
| NFL '95 (Sep 5, 1994 prototype B) | 5 September 1994 17:42:46 | Sega Mega Drive |
| NFL '95 (Sep 5, 1994 prototype) | 5 September 1994 07:13:46 | Sega Mega Drive |
| NFL '95 (Sep 6, 1994 prototype) | 6 September 1994 07:27:06 | Sega Mega Drive |
| NFL '95 (Sep 7, 1994 prototype) | 7 September 1994 19:54:56 | Sega Mega Drive |
| NFL '95 (Sep 8, 1994 prototype) | 8 September 1994 06:23:12 | Sega Mega Drive |
| NFL '95 (Sep 9, 1994 prototype) | 9 September 1994 21:51:16 | Sega Mega Drive |
| NFL '95 Game Gear (Aug 25, 1994 prototype A) | 25 August 1994 06:17:16 | Game Gear |
| NFL '95 Game Gear (Aug 25, 1994 prototype) | 25 August 1994 07:28:28 | Game Gear |
| NFL '95 Game Gear (Aug 26, 1994 prototype) | 26 August 1994 09:51:06 | Game Gear |
| NFL '95 Game Gear (Aug 31, 1994 prototype) | 31 August 1994 11:50:32 | Game Gear |
| NFL '95 Game Gear (Aug 8, 1994 prototype) | 8 August 1994 16:38:56 | Game Gear |
| NFL '95 Game Gear (Sep 10, 1994 prototype) | 10 September 1994 22:25:36 | Game Gear |
| NFL '95 Game Gear (Sep 11, 1994 prototype B) | 11 September 1994 11:56:04 | Game Gear |
| NFL '95 Game Gear (Sep 11, 1994 prototype C) | 11 September 1994 16:26:50 | Game Gear |
| NFL '95 Game Gear (Sep 12, 1994 prototype) | 12 September 1994 15:10:34 | Game Gear |
| NFL '95 Game Gear (Sep 14, 1994 prototype F) | 14 September 1994 13:26:08 | Game Gear |
| NFL '95 Game Gear (Sep 14, 1994 prototype) | 14 September 1994 06:35:50 | Game Gear |
| NFL '95 Game Gear (Sep 2, 1994 prototype) | 2 September 1994 12:28:06 | Game Gear |
| NFL '95 Game Gear (Sep 8, 1994 prototype) | 8 September 1994 11:57:20 | Game Gear |
| NHL All-Star Hockey '95 (Dec 1, 1994 prototype B) | 1 December 1994 21:34:18 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Dec 1, 1994 prototype) | 1 December 1994 10:38:12 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Dec 2, 1994 prototype) | 2 December 1994 14:32:38 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Nov 19, 1994 prototype) | 20 November 1994 18:30:32 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Nov 21, 1994 prototype) | 21 November 1994 19:25:10 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Nov 22, 1994 prototype) | 22 November 1994 18:19:36 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Nov 23, 1994 prototype) | 23 November 1994 14:10:48 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Nov 27, 1994 prototype) | 27 November 1994 21:01:38 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Nov 28, 1994 prototype) | 28 November 1994 18:39:26 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Nov 29, 1994 prototype) | 29 November 1994 21:57:32 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Nov 7, 1994 prototype) | 9 November 1994 19:50:50 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Nov 9, 1994 prototype) | 9 November 1994 17:02:30 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Oct 1, 1994 prototype) | 1 October 1994 17:48:04 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Oct 21, 1994 prototype) | 24 October 1994 14:15:42 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Sep 14, 1994 prototype) | 21 September 1994 10:21:16 | Sega Mega Drive |
| NHL All-Star Hockey '95 (Sep 29, 1994 prototype) | 29 September 1994 16:12:06 | Sega Mega Drive |
| NHL All-Star Hockey (Dec 15, 1994 prototype) | 14 December 1994 21:49:12 | Game Gear |
| NHL All-Star Hockey (Dec 22, 1994 prototype) | 22 December 1994 03:37:22 | Game Gear |
| NHL All-Star Hockey (Dec 29, 1994 prototype) | 29 December 1994 15:35:42 | Game Gear |
| NHL All-Star Hockey (Dec 31, 1994 prototype) | 30 December 1994 19:43:04 | Game Gear |
| NHL All-Star Hockey (Jan 11, 1995 prototype) | 12 January 1995 02:40:16 | Game Gear |
| NHL All-Star Hockey (Jan 13, 1995 prototype) | 13 January 1995 20:02:32 | Game Gear |
| NHL All-Star Hockey (Jan 16, 1995 prototype) | 16 January 1995 18:07:08 | Game Gear |
| NHL All-Star Hockey (Jan 2, 1995 prototype) | 2 January 1995 11:58:40 | Game Gear |
| NHL All-Star Hockey (Jan 20, 1995 prototype) | 20 January 1995 16:41:40 | Game Gear |
| NHL All-Star Hockey (Jan 21, 1995 prototype) | 21 January 1995 22:11:14 | Game Gear |
| NHL All-Star Hockey (Jan 24, 1995 prototype A) | 24 January 1995 21:33:54 | Game Gear |
| NHL All-Star Hockey (Jan 24, 1995 prototype B) | 24 January 1995 18:18:44 | Game Gear |
| NHL All-Star Hockey (Jan 24, 1995 prototype C) | 24 January 1995 23:02:04 | Game Gear |
| NHL All-Star Hockey (Jan 24, 1995 prototype) | 24 January 1995 14:44:00 | Game Gear |
| NHL All-Star Hockey (Jan 25, 1995 prototype) | 25 January 1995 22:03:14 | Game Gear |
| NHL All-Star Hockey (Jan 26, 1995 prototype) | 26 January 1995 17:42:56 | Game Gear |
| NHL All-Star Hockey (Jan 3, 1995 prototype) | 3 January 1995 22:54:50 | Game Gear |
| NHL All-Star Hockey (Jan 7, 1995 prototype) | 7 January 1995 22:57:42 | Game Gear |
| NiGHTS into Dreams (May 14, 1996 prototype) | 14 May 1996 18:32:35 | Sega Saturn |
| Nippon Mukasi Banasi (Prototype) | | Sega Pico |
| Onimusha 2: Samurai's Destiny (Jul 24, 2002 prototype) | 24 July 2002 13:05:54 | PlayStation 2 |
| Panzer Dragoon II Zwei (Feb 5, 1996 prototype) | 5 February 1996 20:36:35 | Sega Saturn |
| Panzer Dragoon Saga (Dec 22, 1997 prototype) | 22 December 1997 | Sega Saturn |
| Panzer Dragoon Saga (Dec 30, 1997 prototype) | 30 December 1997 | Sega Saturn |
| Panzer Dragoon Saga (Nov 30, 1997 prototype) | 30 November 1997 | Sega Saturn |
| Panzer Dragoon Saga (Sep 16, 1997 prototype) | 16 September 1997 | Sega Saturn |
| Pepe's Puzzles (Feb 10, 1995 prototype) | 10 February 1995 17:34:30 | Sega Pico |
| Pepe's Puzzles (Feb 18, 1995 prototype) | 19 February 1995 22:38:16 | Sega Pico |
| Pepe's Puzzles (Feb 20, 1995 prototype) | 21 February 1995 20:16:44 | Sega Pico |
| Pepe's Puzzles (Feb 23, 1995 prototype) | 24 February 1995 21:43:32 | Sega Pico |
| Phantasy Star IV (Aug 15, 1994 prototype) | 16 August 1994 06:19:18 | Sega Mega Drive |
| Phantasy Star IV (Jun 8, 1994 prototype) | 8 June 1994 15:02:02 | Sega Mega Drive |
| Phantasy Star IV (May 30, 1994 prototype) | 31 May 1994 11:27:20 | Sega Mega Drive |
| Phantasy Star IV (Nov 7, 1994 prototype) | 8 November 1994 06:26:50 | Sega Mega Drive |
| Phantasy Star IV (Oct 27, 1994 prototype) | 28 October 1994 06:49:42 | Sega Mega Drive |
| Pico (Storyware) Sampler (Jun 14, 1996 prototype) | 14 June 1996 06:48:50 | Sega Pico |
| Pico (Storyware) Sampler (Jun 25, 1996 prototype) | 25 June 1996 09:51:32 | Sega Pico |
| Pico (Storyware) Sampler (Jun 7, 1996 prototype) | 7 June 1996 19:23:30 | Sega Pico |
| Pico Baseball (Prototype) | | Sega Pico |
| Pico Soccer Mezase Soccer Senshu (Prototype) | | Sega Pico |
| Primal Rage (Feb 6, 1996 prototype) | 6 February 1996 10:56:44 | Sega Saturn |
| Putty Squad (Early prototype) | | Sega Mega Drive |
| Quake III: Arena (Oct 26, 2000 prototype) | 26 October 2000 18:01:36 | Dreamcast |
| Racing Simulation 2: Monaco Grand Prix Online (Jun 5, 2001 prototype) | 5 June 2001 17:43:08 | Dreamcast |
| Radical Rex (Mega Drive Prototype) | | Sega Mega Drive |
| Resident Evil 2 (Feb 22, 2000 prototype) | 22 February 2000 14:34:41 | Dreamcast |
| Richard Scarry's Busytown (Aug 15, 1994 prototype) | 15 August 1994 16:19:54 | Sega Mega Drive |
| Richard Scarry's Busytown (Aug 17, 1994 prototype) | 17 August 1994 20:22:48 | Sega Mega Drive |
| Richard Scarry's Busytown (Aug 25, 1994 prototype) | 25 August 1994 14:27:00 | Sega Mega Drive |
| Richard Scarry's Busytown (Aug 26, 1994 prototype B) | 26 August 1994 12:01:50 | Sega Mega Drive |
| Richard Scarry's Busytown (Aug 26, 1994 prototype) | 26 August 1994 08:31:04 | Sega Mega Drive |
| Richard Scarry's Busytown (Aug 9, 1994 prototype) | 9 August 1994 19:21:36 | Sega Mega Drive |
| Richard Scarry's Busytown (Jul 21, 1994 prototype) | 21 July 1994 20:00:46 | Sega Mega Drive |
| Ristar (Aug 12, 1994 prototype) | 12 August 1994 12:57:54 | Sega Mega Drive |
| Ristar (Aug 26, 1994 prototype) | 26 August 1994 14:19:16 | Sega Mega Drive |
| Ristar (Jul 1, 1994 prototype) | 1 July 1994 09:12:12 | Sega Mega Drive |
| Ristar (Jul 18, 1994 prototype) | 18 July 1994 05:17:18 | Sega Mega Drive |
| Ristar (Nov 1, 1994 prototype) | 1 November 1994 17:12:14 | Game Gear |
| Ristar (Nov 2, 1994 prototype) | 4 November 1994 09:36:24 | Game Gear |
| Ristar (Oct 19, 1994 prototype) | 19 October 1994 15:25:54 | Game Gear |
| Ristar (Oct 24, 1994 prototype) | 26 October 1994 10:02:54 | Game Gear |
| Ristar (Sep 9, 1994 prototype) | 29 September 1994 16:35:26 | Game Gear |
| Road Rash (Feb 11, 1995 prototype) | 11 February 1995 | Sega CD |
| RoboCop (May 14, 2001 prototype) | 14 May 2001 17:17:22 | PlayStation 2 |
| Sega DTS CD (November 1996) | | Sega Saturn |
| Sega Multimedia Studio: Sega CD Demo (May 29, 1992 prototype) | 29 May 1992 04:04:04 | Sega CD |
| Sega Rally Championship (Oct 31, 1995 prototype) | 3 November 1995 13:27:30 | Sega Saturn |
| Shadow Squadron (Feb 13, 1995 prototype) | 14 February 1995 16:40:16 | Sega 32X |
| Shadow Squadron (Feb 22, 1995 prototype) | 22 February 1995 12:14:20 | Sega 32X |
| Shadow Squadron (Feb 6, 1995 prototype) | 6 February 1995 18:31:50 | Sega 32X |
| Shadow Squadron (Mar 13, 1995 prototype B) | 11 March 1995 15:24:48 | Sega 32X |
| Shadow Squadron (Mar 13, 1995 prototype) | 2 August 1995 09:27:38 | Sega 32X |
| Shadow Squadron (Mar 18, 1995 prototype) | 18 March 1995 10:37:42 | Sega 32X |
| Shadow Squadron (Mar 2, 1995 prototype) | 2 March 1995 14:24:46 | Sega 32X |
| Shadow Squadron (Mar 6, 1995 prototype) | | Sega 32X |
| Shadowrun (Dec 28, 1993 prototype) | 28 December 1993 13:55:46 | Sega Mega Drive |
| Shadowrun (Dec 31, 1993 prototype) | 3 January 1994 08:26:38 | Sega Mega Drive |
| Shadowrun (Jan 25, 1994 prototype C) | 25 January 1994 22:22:42 | Sega Mega Drive |
| Shadowrun (Jan 25, 1994 prototype) | 25 January 1994 14:05:26 | Sega Mega Drive |
| Shanghai II: Dragon's Eye prototype | | Sega Mega Drive |
| Shining Force II (Apr 27, 1994 prototype) | 28 April 1994 11:53:50 | Game Gear |
| Shining Force II (Apr 4, 1994 prototype) | 12 April 1994 05:29:30 | Sega Mega Drive |
| Shining Force II (Jul 20, 1994 prototype) | 20 July 1994 16:53:32 | Game Gear |
| 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 |
| Sonic Heroes (Sep 28, 2003 prototype) | 28 September 2003 | PlayStation 2 |
| Sonic Mega Collection (Aug 15, 2002 prototype) | 15 August 2002 | Nintendo GameCube |
| Sonic R (Sep 10, 1997 prototype) | 10 September 1997 15:10:40 | Sega Saturn |
| Sonic Spinball (Apr 12, 1994 prototype) | 12 April 1994 05:26:36 | Game Gear |
| Sonic Spinball (Apr 13, 1994 prototype) | 13 April 1994 00:54:06 | Game Gear |
| Sonic Spinball (Apr 15, 1994 prototype) | 15 April 1994 15:33:12 | Game Gear |
| Sonic Spinball (Apr 21, 1994 prototype) | 21 April 1994 03:30:02 | Game Gear |
| Sonic Spinball (Apr 27, 1994 prototype) | 27 April 1994 02:51:42 | Game Gear |
| Sonic Spinball (Apr 29, 1994 prototype B) | 29 April 1994 19:48:06 | Game Gear |
| Sonic Spinball (Apr 29, 1994 prototype) | 29 April 1994 04:01:16 | Game Gear |
| Sonic Spinball (Apr 5, 1994 prototype) | 5 April 1994 16:07:16 | Game Gear |
| Sonic Spinball (Mar 10, 1994 prototype) | 10 March 1994 16:41:12 | Game Gear |
| Sonic Spinball (Mar 11, 1994 prototype) | 11 March 1994 11:09:16 | Game Gear |
| Sonic Spinball (Mar 21, 1994 prototype) | 21 March 1994 06:12:52 | Game Gear |
| Sonic Spinball (Mar 28, 1994 prototype) | 28 March 1994 04:54:36 | Game Gear |
| Sonic Spinball (Mar 29, 1994 prototype) | 29 March 1994 05:35:34 | Game Gear |
| Sonic Spinball (Mar 30, 1994 prototype) | 30 March 1994 04:54:36 | Game Gear |
| Sonic Spinball (Mar 7, 1994 prototype) | 7 March 1994 04:24:38 | Game Gear |
| Sonic Spinball (May 25, 1994 prototype) | 25 May 1994 11:24:16 | Game Gear |
| Sonic Spinball (May 3, 1994 prototype) | 3 May 1994 17:27:16 | Game Gear |
| Sonic Spinball (May 30, 1994 prototype) | 30 May 1994 21:25:46 | Game Gear |
| Sonic Spinball (May 31, 1994 prototype) | 31 May 1994 10:09:48 | Game Gear |
| Sonic Spinball (May 5, 1994 prototype) | 5 May 1994 02:47:50 | Game Gear |
| Sonic Spinball (May 6, 1994 prototype) | 6 May 1994 11:04:00 | Game Gear |
| Sonic Spinball (Oct 19, 1993 prototype) | 19 October 1993 | Sega Mega Drive |
| Sonic Spinball (Sep 17, 1993 prototype) | 17 September 1993 | Sega Mega Drive |
| Sonic the Hedgehog - Triple Trouble (Aug 16, 1994 prototype) | 16 August 1994 20:20:36 | Game Gear |
| Sonic the Hedgehog - Triple Trouble (Aug 8, 1994 prototype) | 8 August 1994 16:05:44 | Game Gear |
| Sonic the Hedgehog 2 (Aug 21, 1992 prototype) | 21 August 1992 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Nick Arcade prototype) | 1992 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Sep 14, 1992 prototype) | 14 September 1992 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Sep 18, 1992 prototype - Beta 4) | 18 September 1992 14:26:36 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Sep 21, 1992 prototype - Beta 5) | 21 September 1992 10:06:52 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Sep 22, 1992 prototype - Beta 6 - B) | 22 September 1992 17:42:12 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Sep 22, 1992 prototype - Beta 6) | 22 September 1992 16:47:42 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Sep 24, 1992 prototype - Beta 7) | 24 September 1992 07:25:56 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Sep 24, 1992 prototype - Beta 8) | 24 September 1992 17:27:48 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Sep 26, 1992 build) | 25 September 1992 23:00:44 | Sega Mega Drive |
| Sonic the Hedgehog 2 (Sep 29, 1992 build) | 29 September 1992 09:33:36 | Sega Mega Drive |
| Sonic the Hedgehog 3 (Nov 3, 1993 prototype) | 3 November 1993 | Sega Mega Drive |
| Sonic the Hedgehog CD (Aug 1, 1993 prototype) | 1 August 1993 16:24:41 | Sega CD |
| Sonic the Hedgehog CD (Aug 19, 1993 prerelease) | 19 August 1993 15:31:21 | Sega CD |
| Sonic the Hedgehog CD (Aug 6, 1993 16:54 prototype) | 6 August 1993 16:54:39 | Sega CD |
| Sonic the Hedgehog CD (Dec 4, 1992 prototype) | 4 December 1992 16:34:01 | Sega CD |
| Sonic the Hedgehog CD (Jul 12, 1993 06:37 prototype) | 12 July 1993 06:47:09 | Sega CD |
| Sonic the Hedgehog CD (Jun 21, 1993 prototype) | 21 June 1993 10:12:41 | Sega CD |
| Sonic the Hedgehog CD (May 12, 1993 prototype) | 12 May 1993 01:03:14 | Sega CD |
| Sonic the Hedgehog CD (Oct 13, 1993 prerelease) | 13 October 1993 00:39:11 | Sega CD |
| Sonic the Hedgehog Pocket Adventure (Oct 22, 1999 prototype) | 22 October 1999 | Neo Geo Pocket Color |
| Sonic the Hedgehog's Gameworld (Aug 2, 1996 prototype) | 2 August 1996 06:08:46 | Sega Pico |