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|titlescreen=G9SE8P 2021-03-04 07-24-53.png |game=Sonic Heroes

|game=Tengen Tetris A prototype of Tengen Tetris for the NES.

[[eJay Club World: The Music Making Experience (Jun 27, 2002 prototype)]]<br> [[Onimusha 2: Samurai's Destiny (Jul 24, 2002 prototype)]]<br>

|game=Xbox Developer Kit Recovery Disc Xbox Developer Kit Recovery Disc for the Xbox.<br>

|game=Tengen Tetris A prototype of Tengen Tetris for the NES.

...nreleased PlayStation 2 Game|6GUN: BattleBourne's Unreleased PlayStation 2 Game]] ...yStation 2 Game|Daredevil: The Man Without Fear - Unreleased PlayStation 2 Game]]

...sh cartridges, which are six in total, contain ROMs which were used to aid the development of their games. Curiously, there are also several other games b * [https://archive.org/details/the-code-monkeys-ds-cards Original page release on archive.org]

...today we present over 349 Microsoft Xbox prototypes and 135 Sega Dreamcast prototypes! From unreleased games to early builds, this lot continues to be fruitful. ...d and given a general overview of some of the main interesting facts about the item in question. <br>

...to finish the project, the release was delayed until August of 2020 where prototypes were released in sets by system every week. <br> Additional prototypes were acquired from the same lot in October 2020. These were dumped by ehw. <br>

|titlescreen=Sonic the Hedgehog 2 (CENSOR prototype).2019-02-13 08.35.49.png |game=Sonic the Hedgehog 2

|game=Sonic the Hedgehog CD |file=Sonic the Hedgehog CD (Dec 4, 1992 prototype).zip

|builddate=Apr 24, 1995 |game=Earthworm Jim 2

...experienced professionals. Presenting, a prototype of Burning Rangers for the Sega Saturn! <br> ...eamcast), and the other a completely new idea through the collaboration of the newest members of Sonic Team. <br>

...ype contains A LOT of changes that were made just a month before the final game went gold in Japan. So hold on to your seat belts because it’s going to b ...ell. The efforts of Sega’s implementation of online play paved the way for the console online gaming that we see to this very day. <br>

...ta. Communication problems, either due to internal politics or the lack of the ability to communicate quickly overseas, were also fairly common between Am ...g ROM files for quality assurance, testing, evaluation, and manufacturing. The BBS was also utilized for sending progress reports, internal memos, softwar