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Penumbra is a tech demo made by Frictional Games to show off the power of the HPL engine, released on July 4, 2006 for free.
July 4, 2006
Penumbra was released on July 4, 2006.
Penumbra is available on PC (Microsoft Windows).
No — Penumbra is a single-player game.
Penumbra was developed by Frictional Games.