Gambler Jiko Chuushinha: Katayama Masayuki no Mahjong Doujou is a traditional 4-player mahjong game based on the manga by Masayuki Katayama, one of many produced by Game Arts over the years. The game offers both a free play mode and a lighthearted story mode which follows Katayama's characters, a group of students who play mahjong to settle their differences. There is also a "Mahjong Dojo" mode which quizzes you on aspects of the game in order to help you learn how to play better.