Silent Hill 1 & 2 were both extremely scary for me. the added sensation of constant sorrow or dread helped a lot too. (haven't played 3 yet, 4 wasn't as creepy as the first 2) Resident Evil 1 & 2 were more "surprising" than scary, but they definitely had my heart thumping... ...and Manhunt. i can't think of another game that had my pulse pounding for almost the entire time i played it. i couldn't relax the whole way through, and the farther you get, the more on edge you become. one of the pinnacle moments was running around the abandoned house, trying to keep two steps ahead of "Piggy."