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This was discovered & posted earlier in the month - probably late posting it here, but I felt like it fit the site's purpose well.
A prototype of Crash Twinsanity for the PlayStation 2.

A slideshow for internal use of Crash Bandicoot: The Wrath of Cortex, detailing many of the game's new features. Includes early design sketches and...

Today, March 25th, marks the 30th anniversary of Rockman's Soccer . To commemorate this milestone, a Japanese sample version of the game has...

They're currently 16% of the way there and are taking donations via Ko-fi.
This archive contains several prototype builds of Shantae: Risky's Revenge in SRL and TAD format. These stretch from as early as March of 2009 to as late as...

The group is currently aiming to raise $500 to purchase 20 more prototypes from the same source - read more about that here, on their site.
The Hidden Palace community recently shared several Xbox 360 prototypes of Mega Man 10 . These early versions were sourced from PartnerNET, ...

These were released on Hidden Palace a few days ago (January 20th).
Crash Bash (Aug 23, 2000 prototype) Spyro: Year of the Dragon (Sep 4, 2000 prototype) Discuss this release on our Discord server!

This is a February 25 2016 build of the JRPG game Persona 5 for the Playstation 3.It has debug menu, cut content and more.Disc dumped by Frostwolf.

Takehiro Ando reveals how the PlayStation 1's quirkiest Japanese puzzle game ended up featuring cute models, weird bombs and a robot anime parody

12 builds of Glover for the Sony PlayStation, dated between January 12, 1999 and November 8, 1999, two versions of the source code, and documents and resources...

Source code (presumed to be the final version), design documentation, and 52 builds for Chicken Run on the Gameboy Color, developed by Blitz Games and...

The documents are a bit broader, encompassing other platforms' Chicken Run games (including an unreleased GBA title).
Here are 68 prototypes of Rayman 3 for the Gameboy Advance. The earliest three builds still refer to the game as Rayman 2, before it was changed over to...

Sonic Heroes (Sep 28, 2003 prototype) Discuss this release on our Discord server!

This is the first released prototype for this game to be on the PS2, apparently.
Sam Barlow talks for the first time about the doomed sequel

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That bit's 13:21 in.
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Today, Saturn hacker Malenko behind Drift King ’97 and NBA Jam TE Walrus Edition, dug through the data on NBA Jam TE, and found two secret characters that were never discovered before. Famed …

If you hold L or R while entering your name, you can put in the following initials & birthdates to access the two:
- Tim Kitzrow: KIT, June 8
- Fox: FOX, August 3