To what game could Penumbra be compared to?

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I have been thinking about that and the closer in term of comparison would be Dark Messiah (the playstation game from Atlus). It could also be like King's Field or Shadow Tower, but penumbra isn't your typical Dungeon Crawler.

Dark Messiah of M&M? Don't know how about consoles but it's a PC game from Arcane Studios.

The closest are in my opinion:

ArxFatalis (lowest levels) (also from Arcane Studios) - similar atmosphere, similar puzzles, traps, dungeons, notes, it even includes giant worm and escape sequence from one horrible horrible thing
Call of Cthulhu
System Shock 2
Thief
Silent Hill