From Hidden Palace
Prototypes
Orengefox has released 18 prototypes.
| | Date | System | | Clockwork Knight - Pepperouchau's Adventure Sample (Nov 15, 1994 build) | 14 November 1994 | Sega Saturn |
| Dreamcast Promotion Disk (Oct 22, 1998 build) | 22 October 1998 | Dreamcast |
| Mario & Sonic at the Olympic Games (USA kiosk demo) | | Nintendo DS |
| Mega Man Battle Network 2 (Oct 16, 2001 prototype - debug) | 16 October 2001 | Game Boy Advance |
| Sega Superstars Demo (Aug 30, 2004 prototype) | 30 August 2004 | PlayStation 2 |
| Sonic Advance Review (Oct 31, 2001 prototype) | 31 October 2001 | Game Boy Advance |
| Sonic Adventure 2 Shop Trial (May 3, 2001 prototype) | 3 May 2001 | Dreamcast |
| Sonic Adventure 2: Battle Review (Nov 29, 2001 prototype) | | Nintendo GameCube |
| Sonic Adventure AutoDemo (Oct 16, 1998 prototype) | 16 October 1998 | Dreamcast |
| Sonic Adventure Taikenban (Mar 2, 1999 build) | 2 March 1999 | Dreamcast |
| Sonic Heroes (Nov 24, 2003 prototype) | | Xbox |
| Sonic Labyrinth (May 25, 1995 prototype) | 25 May 1995 | Game Gear |
| Sonic Riders Trial (Feb 27, 2006 prototype) | 27 February 2006 | PlayStation 2 |
| Sonic Rivals 2 Pre-Production (Oct 22, 2007 prototype) | 22 October 2007 | PlayStation Portable |
| Sonic and the Secret Rings (Trial) | | Nintendo Wii |
| Sonic the Hedgehog 2 Autodemo (Dec 5, 1991 prototype) | 5 December 1991 | Game Gear |
| Tails Adventure (Review Prototype) | 21 July 1995 | Game Gear |
| Urusei Yatsura: Dear My Friends Sample (Feb 4, 1994 prototype) | 4 February 1994 12:26:09 | Sega CD |
Hidden Palace