This face up tile determines the "joker" (okey) for the game - a wild tile that can be used to represent other tiles to complete a combination. The joker is the tile of the same colour and one number greater than the face up tile. For example if the face up tile is the green 10, the green 11s are jokers. The false jokers are not wild - they are used only to represent the tiles that have become jokers. So for example when the green 11s are jokers, the false jokers are played as green 11s (and cannot represent any other tile). If the face up tile is a 13, the 1s of the same colour are jokers.