SimTower: The Vertical Empire (known as The Tower (ザ・タワー, Za Tawā) in Japan) is a construction and management simulation video game developed by OpenBook Co., Ltd. and published by Maxis for the Microsoft Windows and Macintosh System 7 operating systems in November 1994. In Japan, it was published by OpenBook that same year and was later released for the Sega Saturn and Sony PlayStation in 1996.