PURPOSE: To provide a game machine with the same prescribed game function attached on a prize port capable of adjusting only the number of prize balls on a game shop side, etc.

CONSTITUTION: This machine is equipped with plural start-up ports 5A, 6A provided at a game part 3A and which display the same start-up function by the prize of a hit ball and on which the prescribed number of prize balls is set plural adjusting nails 8A, 9A capable of adjusting the prize probability of the hit ball to each of the start-up ports 5A, 6A, a prize detector which detects prize when the hit ball is prized to either of the start-up ports 5A, 6A and outputs a prize detection signal in accordance with a prized start-up port, a CPU which controls the operation of a display device 4, etc., based on the prize detection signal, a prize ball ejection solenoid, etc. and a CPU which performs such control to make the prize ball ejection solenoid, etc., eject the prescribed number of prize balls based on the prize detection signal.