ASCII is famous for the "Tskuru" series in which the player gets to make their own game. This one allows you to make what is known as a "sound novel" which is like an SNES version of those "choose your own adventure" books which were popular in the early 80's. The expantion port on this could be used with a special memory card which was compatable with any of the Tskuru series which supported it including RPG Tkuru, Music Tskuru and a few others. Note that the game did not come with a memory card, but you could save one of your own creations to the game itself.