Indie developer XeniosVision has released a demo for their monochromatic survival horror game BlackSoul, which was released on GamersGate on the 24th October and is currently in Steam Greenlight.
The game is set in England circa 1972 where people have been turned into psychotic killers by an unknown infection, and the protagonist must save his friends Ava and Sean, stuck in the quarantine area while discovering the secret of the infection.
The demo has the following system requirements:
* CPU:dual core or higher
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RAM:2gb or higher
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GPU:1gb with opengl3.2 support or higher ( integrated or Intel chipsets not supported - low budget cards may not work )
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HDD:800mb of free space
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OS:Windows XP SP2, Windows 7, Windows Vista
The demo for BlackSoul can be found on Strategy Informer here.