3. Silent Hill (series)
The Silent Hill series is storied with insanely sick and twisted Lovecraftian nightmare monsters. The signature of the Silent Hill series is take something scary and then surgically attach something else to it to look like a demon spider. Or three lady demon-freaks playing piggy-back while trying to fillet your soul.
Gore factor: Five pints of blood.Truth be told, it took a long time to find a single screenshot that wouldn't offend people's sensibilities. The creatures drip blood and guts from all over and dealing blows to them — well, let's just say the game isn't pretty. And while the image here is from Silent Hill: Homecoming, Silent Hill II will really screw with your head.