I bought Doom 3 on saturday on my 18th birthday, it's so amazing! I played it until sunup with headphones and the lights off and it freaked me out more than any film or game I've ever played before.
I played it too, very scary game! I was playing once at about 8:30ish with the lights off and was still scared out of my mind, the demonic laughing is just plain creepy. *shivers*
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The Sun and Moon transform day to night, but what transforms the mind? The best techniques are passed on by the survivors.