Parallel Experiment is a cooperative puzzle adventure from Eleven Puzzles that casts two players as detectives trapped in a sinister scientific trial orchestrated by the Cryptic Killer. Set in a noir-inspired world with hand-drawn comic book visuals, the story unfolds through nearly 100 illustrated pages as players uncover a conspiracy involving missing parents and rival brothers. Gameplay hinges on constant communication, with each player receiving different clues and tools to solve nearly 80 intricate puzzles, including logic challenges, ciphers, and interactive NPC interrogations.