"Hail to the king, baby!" We thought we'd never hear someone say that within the Library of Congress, but, hey, there's a first time for everything.

David Gibson, a moving image technician at the Library of Congress, has managed to uncover an original source disc for the unreleased PSP game Duke Nukem: Critical Mass. The game originally released for the Nintendo DS several years ago, but the PSP version never came out, which makes it a rarity.

While hardly a complete retail game, the disc includes the full text and credits for the game, along with "a large chunk of un-obfuscated software code." Game developers and researchers will be able to access its data for use with later developments.

Gibson started his find story with, "Since 2006, the Moving Image section of the Library of Congress has served as the custodial unit for video games. In this capacity, we receive roughly 400 video games per year through the Copyright registration process."

"Several months ago, while performing an inventory of recently acquired video games, I happened upon a DVD-R labeled Duke Nukem: Critical Mass (PSP). ... A line of text on the Copyright database record for the item intrigued me. It reads: Authorship: Entire video game; computer code; artwork; and music."

"I realized then that in my computer was the source disc used to author the UMD for an unreleased PlayStation Portable game. I could feel the lump in my throat. I felt as though I had solved the wizard's riddle and unlocked the secret door."

You can find more details at the official Library of Congress page.