Crystal Gal 2

The Crystal Gal 2 (fully known as Crystal Gal II Mahjong) is an extremely rare, Japanese adult-themed arcade game released in June 1986 by the developer Nichibutsu. Built on the specialized NBMJ8688 arcade hardware, it is a one- or two-player mahjong game that features female opponents. Because of its age and niche release market, surviving physical units and original JAMMA boards are incredibly uncommon today.

The gameplay pits the player against various female opponents in standard mahjong hands. As an "adult" ecosystem game of the mid-86 Japanese arcade market, winning matches reveals graphic or suggestive art styles of the opponents.