P.T. was released in 2014 as a free playable teaser for Silent Hills, a horror project that was later cancelled, and Lisa is the ghost who haunts its endlessly looping corridor. Her breathing became one of the game's most recognisable audio cues because players often heard her before they saw her, turning a simple sound into a warning. After the teaser was removed from sale, clips of its audio continued to circulate in horror compilations, reaction videos and fan edits, keeping Lisa's presence alive long after the game itself disappeared.