I'm looking for movies that genuinely mess with your mind, keep you guessing throughout, and leave you questioning everything by the end.

Something with unpredictable twists, psychological mind games, shocking revelations, and preferably an ending that makes you sit there thinking, "WHAT DID I JUST WATCH?"

I've already watched pretty much all the well-known and popular movies in this genre, so I'm particularly looking for hid'en gems, underrated movies, and lesser known international thrillers.

Hit me with your best recommendations. The more mind blowing, the better!