What are the Mahjong games doing in MAME?
Mahjong is very popular in Japan, so literally dozens (if not hundreds) of mahjong games have been made for JDM consumption. While this may seem strange to people outside of Japan, there are other similar situations in the world of sport. American football, cricket, and rugby each are big sellers in specific countries and largely unheard of elsewhere. Anyway, mahjong isn’t actually too hard to learn, and it can greatly expand your selection of puzzle/strategy type games. Several online guides exist, including Introduction to Ma-Jan Video Games, SYS 2064, Mahjong for Dummies, and Mahjong In MAME, which teaches you Mahjong using MAME and some of the mahjong games it emulates.