I'm not sure if this is a well-known title or something more niche, but from what I recall, the 'darkest game' novel I read had a twist that completely recontextualized the hunter-prey dynamic. The protagonist, believing he's a participant trying to survive a lethal reality game for a cash prize, gradually discovers the 'game' isn't a broadcast spectacle but a private, personalized psychological breakdown engineered by a rival who ruined his life years earlier. The other 'contestants' aren't strangers; they're actors hired to gaslight him, and the remote wilderness isn't a set—it's the actual location of a past trauma he'd repressed.
The brilliance wasn't just the 'it was all fake' reveal, which some stories bungle, but how the mechanics of the fake game deliberately mirrored the methods of his original psychological manipulation. Every rule, every timed challenge, echoed a specific pressure point from that past event. The twist lands because the narrative makes you feel the protagonist's paranoia about the game's arbitrary cruelty, only to realize the cruelty was hyper-specific, not arbitrary at all. It shifts from a survival thriller to a chilling revenge story about making someone relive their worst moment while thinking it's something new.
Frankly, the last third after the reveal loses some steam for me, as it becomes a more straightforward cat-and-mouse, but the moment the protagonist finds a 'prop' weapon with his own childhood initials scratched into the grip—that's when the floor drops out. The book spends so much time on game logic that the personal, petty specificity of the revenge hits like a physical blow.