The game, which was created by Frictional Games founder Thomas Grip a number of years ago, was never finished but because of popular demand by fans, he decided to release a playable (but still unstable) alpha version of Unbirth which should give Penumbra fans an interesting insight into the series. The web site also has some more info on the history of the game's development along with monster sketches, level screenshots and design docs and more. Anyone interested in game development should check this out.
[Via Blue's News]
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