If this game is played for money, then it is gambling which is haraam, because it is not permissible to offer money except in contests that were mentioned by the Prophet (peace and blessings of Allaah be upon him) when he said: There should be no (money) prizes except for contests in archery, camel-racing or horse - ...
The game of mahjong requires four players, 144 tiles and two dice to roll. It's important to note, however, that there are variations in how the game is played from country to country. The goal of mahjong is similar to poker, in that the aim is to make matching sets and pairs.