Darius is a two-dimensional horizontally scrolling shoot 'em up set in a fictional future. Developed by Taito and released in arcades in 1987, the game is unique among shoot 'em ups as the game's screen is three times wider than conventional size, and the arcade cabinet uses an arrangement of three screens to accommodate it. By April of 1987, Darius had become the most popular arcade game in Japan, going on to be the third highest-grossing large arcade game of 1987.