A merchandiser and a method of controlling a game thereof are disclosed. The merchandiser includes prize cartridges that have transparent partitions among which prizes are contained, drive parts that move the respective prize cartridges, a gaming device that executes a game provided for each of identification numbers of the prize cartridges, and a controller that controls the drive part so that the prize of the prize cartridge is dropped to a prize discharge part according to a result of playing the game. Thereby, since a designated prize can be acquired according to the result of playing a game, an interest in the game can be increased.