In Moo Who, players adopt animal identities and blend in with a crowd of computer-controlled characters, all while producing authentic-sounding animal vocalizations into their microphones. A group of designated hunters must listen carefully to the cacophony of bleats, moos, and chirps to identify which voices belong to real players trying to deceive them. The core tension stems from how convincingly participants can mimic their assigned creature while the opposing team races against time to separate genuine animals from imposters. Success hinges on both vocal deception and keen auditory perception, making it a social party experience centered entirely around sound-based gameplay.