Kiwame Mahjong DXII The 4th Mondo21Cup Competition is the 2003 edition of Athena's long running Mahjong Pro Kiwame series of mahjong games. The game offers a challenging Riichi Mahjong simulation that allows the player to square off against a roster of professional players from the Japanese Professional Mahjong League. Kiwame Mahjong DX II remains one of the most difficult and rewarding mahjong games in existence, and is a must-play for any fan of the genre.