Mahjong is a tile-based game that originated in China and has become increasingly popular in Finland over the years. Mahjong at Finnish mobile casinos is played in the same way as it is in China, with some slight variations. The game is played with a set of 144 tiles that are divided into four symbols: Circles, Bamboo, Characters, and Winds. The aim of the game is to build four sets and a pair with the tiles. In Finnish mobile casinos, players begin by arranging their tiles in four even rows, with each row having 13 tiles.
Players then select a tile from the back row called the "Wall" and discard a tile. This is done in a clockwise manner, with each player taking a turn discarding a tile. When a player has a valid set of tiles, they can call a "Mahjong" and win the round.