That’s Not My Neighbor is an indie horror-simulation game developed by Nacho Sama, set in 1955 in an apartment building infested by doppelgangers. Players take on the role of D.D.D.’s doorman, responsible for checking documents, observing details, and deciding who is the real resident and who is the imposter. The intense gameplay with multiple modes from Campaign, Nightmare to Arcade requires high concentration because even the smallest mistake can let the doppelganger in and cause unpredictable consequences.