My fucked-shit meter is more about
"Does the game forced you to do it? or can you avoid/ignore it?"
Therefore my short list that came off of my head :
A Game/studio that has Rape + Necrophilia + Loli content all in one package -
[RPGM]The Dead End~The Maidens and the Cursed Labyrinth~ AIO EDITION [v1.03] [Osanagocoronokimini / Kagura Games]
or any of the game came from
Osanagocoronokimini because Zombie & Rape & eh...you know...loli.
It's
not that bad but the fact there is such an element,
I'll give it 7/10, mainly because some of their title can avoid doing those fucked up shit actions but some can't and it's the entire selling point to begin with.
Altho the studio does have a reputation of tricking people that it has unique CG when it's just Same position with different texture over the characters + CG lagging which some might get turned off.
As for pure fucked up shit, the only one came off of my head is this -
[Other]Graveyard Executioner [Final] [Blue Mad Diode], mainly the gallery, insanity to see this being on Xvideo tho xD
In terms of gameplay? Eh...it's whatever, just the fact it's a pure Guro fetish game
I give it a 10 on a fucked up scale
I want to include these two, but they're fine...well to me at least, unless the Rape tag instantly give you a 10 then go ahead, but it's a 6.5/10 to me on fucked-shit meter
[Unity]Night Of Revenge [v1.0.7] [D-Lis]
[Unity]The Fairy Tale of Holy Knight Ricca: Two Winged Sisters [v1.3.6] [Mogurasoft]
Oh yea, I almost forgot
Black Souls 1&2, those should ruin your day as you read or play through it
Note : My tolerance to fucked-up-shit is pretty high, if you want to test yours, go read some kubikiri's work in nh site or something xD