LSD: Dream Emulator is an exploration game developed and published by Asmik Ace Entertainment for the PlayStation. In LSD, the player explores surreal environments without any objective. The player can only move and touch objects that will warp them to another setting. The game was conceived by Japanese artist Osamu Sato, who rejected the idea of games, and wanted to use the PlayStation as a medium for creating contemporary art. The game's concept is based on a dream diary kept by Asmik Ace employee Hiroko Nishikawa for over a decade.
The game received a limited release in Japan on October 22, 1998, alongside a soundtrack and a book composed of excerpts from the dream diary. LSD quickly fell into obscurity, but in years since has experienced a resurgence in popularity due to its eccentricity being an engaging point of discussion for humor blogs and Let's Play commentators. In retrospect, critics have praised its whimsical qualities, calling it one of the most "unnerving", "experimental", and "unpredictable" video games of all time. The game was also released on the Japanese PlayStation Store in 2010.
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