The builds were obtained and documented by preservation group Hidden Palace in collaboration with Spyro content creator Hwd405.
Both releases illuminate differences between prototype discs and the final retail releases, and provide primary-source material for preservation and research.
Hidden Palace lists the Spyro: Year of the Dragon prototype with a disc date of September 4, 2000.
That date places the build roughly ten days before the known final retail build, indicating it represents a near-complete stage in Insomniac Games’ development process.
The prototype contains a number of notable deviations from the shipped game: a completely different soundtrack on some tracks, absent or altered sound effects, alternative object placement across levels, and audiovisual differences in several cutscenes.
The disc also contains leftover data from earlier iterations, including a test level for the Kangaroo character Sheila.
In that test data Sheila appears with horns reminiscent of her original concept art rather than her final in-game appearance.
The Crash Bash prototype is listed by Hidden Palace as dated August 23, 2000, situating it approximately two months before the earliest final build.
This Crash Bash build—developed at the time by Eurocom and published by Sony Computer Entertainment—contains a number of unfinished elements, including placeholder levels, temporary menu artwork, and unpolished icons, providing insight into the mid-development state of the party-focused Crash Bandicoot spin-off.
Hwd405 and Hidden Palace published their findings and dumps to make the content available for preservation and study.
Hidden Palace’s site hosts documentation and technical notes for both discs, while Hwd405’s YouTube channel includes video demonstrations of the differences between prototype and retail versions.
These prototype releases contribute to the broader effort to preserve video game history and offer developers, historians, and fans concrete artifacts for study.
For direct access to the documented builds and demonstrations, consult Hidden Palace’s archive and Hwd405’s channel for video breakdowns and comparisons.