Mahjong is a tile-based game developed in China during the Qing dynasty and is currently gaining more and more users in Spain. The mobile version of Mahjong has simple rules that allow users to enjoy a satisfying and exciting game. Each game begins with a set of 144 tiles drawn randomly from a container. The aim of the game is to create winning hands with the tiles. These hands are stratified into three categories: Sets, Pairs and Honors. A set is composed by three tiles of the same kind, a pair is composed by two tiles of the same kind and honors are the special tiles composed of four Wind tiles and three Dragon tiles, which add more value to the hand. After the player has created a hand with one of these categories, they must place the tiles on the table in order to announce the win. The hands are also divided into two categories: concealed and melded. A concealed hand is composed by only sets and pairs and melded hands by sets, pairs and honors.