Fast forward two decades and game players now realise that such early and unreleased versions of games have genuine historical value. Celebrating its 15th anniversary next month, the website Hidden Palace is a collective dedicated to tracking down and archiving video game prototypes, source code and other overlooked artefacts from the development process. Last month, the site made headlines across the video game world when it announced it had secured more than 700 PlayStation 2 demo and...

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