The arcade game employed some trick with its sound to make the effects of the carnage seem to be beamed directly into your inner ear. It cost 25¢ to play, plus $500 in therapy bills.
The first level has you lopping the heads off flayed ghouls, while you stride calmly past partially vivisected people in cages and strewn on the floor.
The first boss is a room full of shredded human flesh from which giant leeches leap out and try to attach themselves to you.
The boss of stage 2: the Poltergeist, who would later return as a recurring boss in the other Splatterhouse games. In this game, the angry ghost violently shakes the room around, making stuff fall from the ceiling. It then proceeds to possess a chair, three knives, and a creepy painting of an eyeball. When you beat it, it pulls off a Last Ditch Move, having a chandelier fall from the ceiling (which kills you instantly, whether you're using cheats or not). The music doesn't help, sounding completely deranged, and as the fight progresses, it begins to sound more and more insane.
One of the bosses is inside an abandoned church in original arcade version. Said monster is an upside-down cross with demonic masks firing at you.
The fantastically creepy (if not flat-out wrong) Womb Level in the first game where the only enemies are horrid fetuses that first fly off in a sort of bubble, then jump on you and drain your life away. And the boss is a pillar of meat with the bulging heart of the house that sends off millions of these "babies".
The heart is actually a uterus. It's more apparent in the arcade version, where its water breaks when it's destroyed.
The final boss, Hell Chaos, is a giant rotting head and hands.
Right before fighting Bellyache, the enemy that ran away from you witnesses two of its buddies being eaten by the boss. Terrified by this, it tries to flee but saw you coming in. At the last second, it decided that it would rather be devoured by Bellyache instead of being slaughtered by Rick. What does that say about Terror Mask?
The bosses of the third level have you fighting off evil fetuses.
The final boss of the second game topping that by being a giant flying mass of red flesh and screaming faces.
The second boss. His laughter is haunting.
The third game is made all the scarier with pictures of the characters that are low-res, yet photo-realistic. Didn't save Jennifer in time? Good luck sleeping tonight, motherfucker!
"The Doll that Bled". As if the title of the level wasn't eerie enough, the titular doll is really going to bother you. First you see a creepy looking doll, which the Mask seems a little cautious about it. It then begins levitating all the furniture around the room, in obvious reference to the second boss in the original game. Then, the doll starts growing tentacles. Lots of tentacles. It then proceeds to grow into a mammoth, vaguely humanoid beast composed entirely of tentacles, wearing the levitated furniture as body armour. From then on, it's okay...until you actually have to rip its jaws off and reach into its bloody mass to reach the Doll.
The doll itself is very creepy, falling easily in the Uncanny Valley and says "Mama!" with a chilling, disturbing voice.
It may double as a funny moment when even the Terror Mask's worried about fighting Biggy Man. Yes, the Terror Mask — of all things — is worried about fighting him, even though Rick is quite plainly pointing a shotgun in his face! In the words upon seeing him in the remake:
Terror Mask: "Wait, wait, wait — I know this guy! ...yeah, we are screwed."
During the fight, HE ESCAPES FROM YOU and then makes you look around an entirely pitch black room with just the revving of his chainsaws dragging across the ground as he rushes toward you at the last second! Have a good sleepless night.
The worst part was the cutscene right after the fight, where Rick repeatedly rams one of Biggy Man's chainsaw hands into him, all the while you can hear him screaming in agony. He's the only monster in the game to actually SCREAM in agony. The screaming... dear God the screaming...
The gigantic Cthulhu-like monster in the tank near the end of Phase 6. Said beastie will growl at you and try to reach Rick by hitting the walls of the tank.
What really makes it creepy is its status as a Big Lipped Alligator Moment, as there is absolutely zero findable knowledge on what it is and what its doing down there, and West himself says nothing about it when Rick finds him for the stage's boss fight. One of scariest things in the entire franchise, indeed.
Phase 8 has you enter a house of mirrors. Each room had three, each with the reflection of Jennifer. The first reflection begs you to save her. The second implores you to run and save yourself. The third tells you how pathetic you are. You need to break one of the mirrors to get to the next room. If you choose the wrong one, an evil Jen clone will burst out and try to kill you. And if you run out of time, a small army of Jen clones appear. God help you if you don't have Berserk Mode available. It doesn't help they're the Demonic Spider variant of Hominis.