To try and be spoiler friendly I'm going to describe the twist but not tell you what it's from.
So it's from kind of a mystery/puzzle game. These characters were abducted and put into a sort of torture game. One of the prevailing mysteries is who is behind the whole thing. There is a spattering of clues throughout the game so you are trying to figure out who it could be the whole time. Could it be the plucky kid with a bucket on his head? Or could it be the cold and emotionless woman wearing enough clothes for 1/3 of an outfit? NO! Surprise! It was a comatose old man in a wheelchair that was conveniently off camera the whole game and nobody ever directly mentioned! Seriously. He was with them the entire game. The only one who didn't know was the player. He was right there, and presumably they were wheeling him around the whole time! But the player never sees him because the camera never looks at him, and none of the other characters ever actually talk about him for some reason! He wasn't hiding, he wasn't in disguise, he wasn't even invisible, he was just... off screen.
Like imagine you are watching an episode of Sherlock Holmes. He and Watson are going around looking at stuff and gathering clues, and then suddenly Sherlock turns around and points at the camera and shouts "Aha! The culprit was you Moriarty!" and Moriarty is revealed to have been with them, standing behind the cameraman, for the whole episode!
You can't tell me that you've ever seen a twist worse than that!
So it's from kind of a mystery/puzzle game. These characters were abducted and put into a sort of torture game. One of the prevailing mysteries is who is behind the whole thing. There is a spattering of clues throughout the game so you are trying to figure out who it could be the whole time. Could it be the plucky kid with a bucket on his head? Or could it be the cold and emotionless woman wearing enough clothes for 1/3 of an outfit? NO! Surprise! It was a comatose old man in a wheelchair that was conveniently off camera the whole game and nobody ever directly mentioned! Seriously. He was with them the entire game. The only one who didn't know was the player. He was right there, and presumably they were wheeling him around the whole time! But the player never sees him because the camera never looks at him, and none of the other characters ever actually talk about him for some reason! He wasn't hiding, he wasn't in disguise, he wasn't even invisible, he was just... off screen.
Like imagine you are watching an episode of Sherlock Holmes. He and Watson are going around looking at stuff and gathering clues, and then suddenly Sherlock turns around and points at the camera and shouts "Aha! The culprit was you Moriarty!" and Moriarty is revealed to have been with them, standing behind the cameraman, for the whole episode!
You can't tell me that you've ever seen a twist worse than that!