4 Nin Uchi Mahjong

4 Nin Uchi Mahjong (4人打ち麻雀) was the second Mahjong game released for the Famicom by Nintendo. It was the first game for the Famicom ever developed by Hudson Soft. It was the eighth best selling Famicom game released during 1983 and 1984, selling approximately 1,450,000 copies in its lifetime. It was presented as an improvement over Nintendo's original Mahjong game, since it allowed for up to four human players to compete at one time, which is more like a traditional game of mahjong.

Mahjong (Chinese: 麻將; pinyin: má jiàng) is a game for four players that originated in China. Mahjong involves skill, strategy, and calculation, as well as a certain degree of luck (depending on the variation played, luck can be anything from a minor to a dominant factor in winning). In Asia, mahjong is also popularly played as a gambling game. In the game, each player is dealt either thirteen or sixteen tiles in a hand, depending on the variation being played. On their turn, players draw a tile and discard one, with the goal of making four or five melds (also depending on the variation) and one pair, or "head". Winning comes "on the draw" by drawing a new or discarded tile that completes the hand. Thus, a winning hand actually contains fourteen (or seventeen) tiles.

This gameplay shouldn't be confused with mahjong solitaire, more well known to the western world, which is played by removing like tiles from different layouts as they become uncovered.