Planet Mahjong is an online platform for Taiwanese 16-tile mahjong, designed to bring players together whether they are at the same table or playing remotely. Users can start a game with friends or bots, and the table can fill an empty seat when only one human player is available. The platform also offers Marshal, a global scoring engine for tracking scores during online or offline games, helping players calculate results without paper score sheets or disputes.

Beyond digital play, Planet Mahjong helps people connect around real tables. Players can find or post local games and browse mahjong events, including gatherings featuring physical tiles and in-person play. For learning and hand analysis, Miss Flower offers guidance on Taiwanese, Japanese Riichi, and Bombay 13 mahjong. Players can ask questions, learn game rules, or score a completed hand, with related details and follow-up questions kept together. Those seeking personal instruction can also look for vetted teachers in their city.