Back in the 80's, games were usually labelled as children's toys. you had mascots like Mario, link, Zelda, samus, and donkey Kong, and not one of those games talked of blood and gore. Welcome Namco's Splatterhouse. Released on the Turbografx 16, Splatterhouse might very well be the first survival horror game ever released. it's a horror-themed game, obviously, and the title even brags of it's violence and gore.
Rick and Jennifer and students who are exploring west mansion. While inside, Rick and Jennifer and both knocked out and separated. When rick awakes, he's covered in blood, Jennifer is nowhere to be found, and he's wearing a mask he can't remove. now it's different. he's not leaving with the mask and without Jennifer. now the player takes over, as rick explores west mansion, slaying weird creatures, and avoiding grotesque things, to get his girlfriend back, and to get the mask off his face.
As mentioned on my summary, this game had to have paved the way for games like resident evil (mostly Resident Evil, They're both survival horror games) doom, and mortal kombat years later. Being one of the first games to openly depict gore is one thing, having a parental advisory warning before the ESRB is another.
I suggest you go find a copy or download this for Wii's Virtual console, you will have fun with it.