PURPOSE: To realize a game which does not lose a player's interest by constituting the device so that a generation rate of a special picture pattern and a generation rate of a particular picture pattern can be set separately by a special picture pattern setting means, and only the generation rate of the particular picture pattern can be suppressed lowly without being noticed by a player.

CONSTITUTION: On a game panel 3 of a game machine, a special picture pattern display device 6 is provided toward its center upper part, and ordinary picture pattern start gates 8A, 8B, and also, a fluctuation prize-winning device 9 are provided, in its lower part so as to place an ordinary motor-driven accessory 7 between, and in their lower part, respectively, and discharge balls, etc., are controlled by a controller. At the time of this control, whether or not the picture pattern is a special picture pattern, is discriminated, and when it is discriminated to be the special picture pattern, the fluctuation prize-winning device 9 is converted to a state being profitable to a player. In the special picture pattern, an ordinary special picture pattern and a special picture pattern are provided, so that a generation of each of them can be set by a managing device, etc., and when it is discriminated that a stop state of the special picture pattern display device 6 is a special picture pattern, the generation rate of the special picture pattern is increased for a prescribed period.