Honkaku Yonin-uchi Pro Mahjong: Mahjong Ou Portable (or Mahjong-Ou Portable) is a 2006 Japanese PSP game developed by Taito Corporation that simulates the traditional four-player Japanese Riichi Mahjong game, featuring authentic rules and gameplay. It is a "full-fledged" professional-style version of the popular game, allowing players to experience the thrill of Riichi Mahjong with added elements like the "Dora" system for increased luck and uncertainty.
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