Mahjong is very similar to Rummy and is played with tiles. The main objective is to build sets with the tiles through drawing and discarding them. In different variants it has different tiles but it is always played by four players. There is little uniformity in the way the game is played in various provinces in China and it is played in a different way in Hong Kong, Taiwan and Singapore. The traditional Chinese game is played with 144 tiles (including 8 flower/season tiles) and some variants incorporate just 136 tiles (without flower/season tiles which are optional tiles used to apply bonuses). The rules presented here are based upon a consolidation of various different approaches that is documented under the WSOM (World Series of Mahjong) rules which has attempted a more standardized set of rules.