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I love Roguelikes on the one hand and I love Lovecraft on the other.  You too? SWEET! Now put your hands together like I did and checkout Infra Arcana.

Infra Arcana is a Roguelike set in the early 20th century. The goal is to explore the lair of a dreaded cult called The Church of Starry Wisdom. Buried deep beneath their hallowed grounds lies an artefact called The Shining Trapezohedron - a window to all secrets of the universe. Your ultimate goal is to unearth this artefact.

The theme and inspiration for this game comes mainly from the horror fiction writer H.P. Lovecraft. It's not a pure H.P.L game though, as it also draws flavour from various B-horror movies, as well as the 1997 first-person shooter Blood.
As a Roguelike - the game adheres to the virtues of the genre, such as high replay value and challenging tactical game play. 

To put you in the mood to try this game, I'll give you the Mountain Goats killer tune "Lovecraft in Brooklyn"

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