Creepy Neighbor: Lie Detector is a mobile game designed for iPhone users, immersing players in a dystopian scenario where humans must identify replicants disguised as ordinary citizens. Set in a world where replicants pose a significant threat, players take on the role of a guard responsible for screening individuals attempting to enter a residential building. The game emphasizes vigilance and decision-making, as players must distinguish between real humans and replicants to maintain safety in their community.

The gameplay revolves around identifying suspicious behavior and calling for cleanup services when replicants are detected. Players are challenged to remain alert and make quick decisions, as the consequences of a mistake could be dire. It's important to note that the application is intended for entertainment purposes only and functions as a prank trick rather than a genuine polygraph lie detector.