Free! Amnesia Collection (Steam)

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Amnesia Collection includes following games:

• Amnesia: The Dark Descent
• Amnesia: A Machine for Pigs

Amnesia: The Dark Descent and Amnesia: A Machine for Pigs are survival horror video games published by Frictional Games. The Dark Descent features a protagonist named Daniel exploring a dark and foreboding castle, while trying to maintain his sanity by avoiding monsters and other terrifying obstructions.
A Machine for Pigs is an indirect sequel to Amnesia: The Dark Descent, and while set in the same universe as the previous game, it features an entirely new cast of characters and time setting.

Source: Wikipedia articles for

Amnesia: The Dark Descent

and

Amnesia: A Machine for Pigs