 On January 21, 1991, an album containing music from the game and "Space Gun" was co-published exclusively in Japan by Scitron and Pony Canyon.The title was first ported to the PC Engine by Taito and released exclusively in Japan on January 17, 1992.It is a faithful conversion that retains most of the gameplay elements from the arcade original but a number of graphical effects were removed such as the time transitions and parallax scrolling.