Nintendo DS Custom Mahjong (Japan) 《任天堂DSカスタム麻雀》 is a mahjong game for the Nintendo DS. It is a single-player game that allows players to customize the rules, tiles, and background music. The game has a variety of options for customizing the game, including the ability to select a particular mahjong style, the ability to choose from a variety of tiles, and the ability to choose from a variety of background music. The game also includes a tutorial mode, which provides step-by-step instructions on how to play the game. The game also includes a ranking system, which enables players to compare their scores with other players. Custom Mahjong (Japan) is an excellent choice for those who want to practice their mahjong skills or just have a fun time playing a classic game.