Six real rule systems — American with its own original 50-hand Dragon House Card, Hong Kong Classical, Taiwanese 16-tile, Riichi, Sichuan Bloody-End, and Vietnamese — played in the rooms where history played them. Local multiplayer over WiFi and Bluetooth: no servers, no accounts, no internet required. The room is the server.

A full Learning Center, six machine-verified training drills, an in-game advisor, and a travelling Atlas of the game's whole journey — taught by the Mahj Dragon herself.