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Kasou Jansou: MacPon, known in-game as MacPon, is a riichi mahjong game developed and published by Enzan-Hoshigumi for Macintosh computers exclusively in Japan in 1991.
One of the few riichi mahjong games released for Macintosh computers, MacPon is notable for including five themed "rooms", each with a unique table, set of opponents., sounds, and tile graphics. It also features a mouse-based interface (with "calls" done through drag-selecting your own tiles) and networked multiplayer (including AppleTalk support).
The game later received a CD-ROM sequel in 1994, adding a variety of new themed rooms (for a total of 16 rooms). The original game also received a console port for the Sony PlayStation by Shoeisha on May 12, 1995, where it was re-titled to Entertainment Jansou: That's Pon! (in-game as That's Pon!).