- Nov 26, 2025: A Mojave Thanksgiving - Fallout: New Vegas Prototype
- Oct 31, 2025: Happy Halloween 2025! Dark Empires Prototype & Craig Stitt Interview
- Jun 29, 2025: Animaniacs - Hollywood Hypnotics
- Feb 1, 2025: Frogger 2 Full Development Archive
- Jan 1, 2025: Happy NES Year
- Dec 26, 2024: NESMas - Day 2
- Dec 25, 2024: NESMas - Day 1
- Jul 6, 2024: Vanished without a Trace - Out of the Vortex for the Sega Mega Drive
- Apr 9, 2024: Crash Tag Team Racing (Xbox Prototype)
- Jan 21, 2024: Crash Bash and Spyro 3
- Jan 1, 2024: New Years 2024 - Sonic Heroes
- Dec 25, 2023: A Very Bandicoot Christmas - Crash Bandicoot: Warped Prototype
- Nov 24, 2023: 6GUN: BattleBourne's Unreleased PlayStation 2 Game
- Oct 31, 2023: Daredevil: The Man Without Fear - Unreleased PlayStation 2 Game
- Feb 28, 2023: Phantasy Star Online Prototype
- Feb 15, 2023: PSP Release Candidates
- Dec 25, 2022: Project Deluge: Xbox 360 and Wii
- Dec 9, 2022: Semradical!
- Nov 24, 2022: Sega Technical Institute’s Cancelled Segapede
- Nov 23, 2022: Sonic 3 and Feel Preproduction VHS Tapes!
- Oct 31, 2022: Happy Halloween 2022! Castlevania: Symphony of the Night for the Tiger Game.com!
- Jan 1, 2022: New Years 2022!
- Nov 13, 2021: Go Go Goemon! Mystical Ninja Goemon Zero
- Oct 10, 2021: Mortal Kombat prototype for the Sega Mega Drive
- Sep 18, 2021: Project Deluge: Xbox and Dreamcast
- Jul 24, 2021: Angels with Burning Hearts: Burning Rangers Prototype
- May 1, 2021: Crash Landing
- Apr 17, 2021: Project Deluge: PlayStation 1, Saturn, and CD-I (Part 2)
- Mar 20, 2021: Project Deluge: PlayStation 2
- Jan 1, 2021: Dreams Come True: Sonic 1 (MD) Prototype
- (earlier news)
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The Hidden Palace is a community dedicated to the preservation of video game development media (such as prototypes, hardware, source code, artwork, and more). This website can be utilized as a catalog for the items that we and others are able to collect and share.
If you are interested in contributing, please see our How to Contribute page.
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- Guilty Gear X (May 23, 2000 prototype) by Tikal.
- Call of Duty: Black Ops II (November 7, 2012 Prototype) by GDmad10
- Counter-Strike: Global Offensive (June 18, 2012 prototype) by TheTechnoGuy18
- Nyehmeh by Lilithdesign388
- Pizza Frenzy (Nov 27, 2004 prototype) by Lilithdesign388
- Killer is Dead: Nightmare Edition (Jan 9, 2014 prototype) by Maple Ellie
- Taz: Wanted (Jul 31, 2002 prototype) by Tikal.
- Taz: Wanted (Jun 27, 2002 prototype) by Tikal.
- Taz: Wanted (May 29, 2002 prototype) by Tikal.
- Taz: Wanted (May 2, 2002 prototype) by Tikal. (more)
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Latest news
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Hidden Palace and The Cutting Room Floor present...
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Sonic Chaos (May 17, 1993 prototype)
Sonic Chaos (Jun 30, 1993 prototype)
Sonic Chaos (Jul 13, 1993 prototype)
Discuss this release on our Discord server!
Continuing with our Sonic Month, today we have various prototypes of Sonic Chaos for the Sega Game Gear and Master System!
The development history of this game is somewhat unknown. When development began, the game was given the title "Sonic the Hedgehog 3". Internally, the game was referred by this title many times even going as far as being mentioned by this name in several printed media throughout 1993. It's possible that the title for the game, "Sonic Chaos", was originally going to be both the international and regional title for the game. The game seems to have been shown for the first time (at least in the United States) at Summer CES 1993, which was held on June 3rd to June 6th. Then sometime after CES 1993, Sega of Japan decided to give the game a completely different title in Japan called "Sonic & Tails". The game seems to have been in development primarily for the Sega Master System, as there are signs in the prototype from May that the Game Gear version was being developed separately at the same time. This could explain why many of the songs are different in both versions of the game.
Having prototypes of this game is pretty special, as prototypes of this game haven’t been released before. Not only that, but we have prototypes that cover a wide range of the development cycle for the game. These prototypes were dumped fresh from the EPROMs, and have been dumped multiple times to ensure that the dumps are correct. The dates of the prototypes themselves come from a mixture of dates that were written on the EPROMs themselves (which are most likely burn dates and not build/version dates) and a date written within the ROM itself that can be verified.
There's plenty more just around the corner. I wonder what's coming out next?
Until next time! More prototypes on November 9 and 10, 2pm Pacific!
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