The real test of a great horror game is playing it in the dark. Things that don't seem too bad while friendly Mr. Daystar is shining through the window become worrying at night. The last time I got so creeped out I needed to save my game and do something else before bed was Signalis, and I remember doing the same thing in the scarier levels of Thief: The Dark Project. With luck, the Dead Space remake might be another for that list...
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