 Initially released on the Sega Saturn in 1996 , the game has gone through several variations , beginning with enhanced video support in conjunction with the Saturn 's MPEG graphics add @-@ on in 1997 , and later being ported to Sony 's PlayStation in 1998 . The PlayStation version was released in North America by Working Designs , who had also produced the English adaptation of the original game , in May 1999 . 
