Even if titlescreen says 1990, Golly! Ghost! was released in June 1991 in Japan.
The game featured a genuine doll's house hooked up to a pinball-style motor board. The motors allowed certain parts of the doll's house to move under CPU control (to allow the ghosts to come out of the toilet etc.). To project the ghosts, a monitor was placed in the base of the cabinet, projecting an inverted image onto a pane of glass. This system proved to be such a good way of removing interference when operating genuine lightguns (the ones in Golly! Ghost! were actually joysticks) that this reflection system has been used in upright lightgun games from Namco ever since (including "Point Blank
"). One interesting point, since the ghosts are not in this dimension and can pass through walls why do they need to open doors to get in.
Shane Van Gorden holds the official record for this game with 327 points.
Victor Entertainment released a limited-edition soundtrack album for this game (Namco Video Game Graffiti Vol. 9 - VICL-8089) on 22/09/1993.