Patent ID: 8382573

Claim:
A gaming system, comprising: random number sampling device which samples a random number from a predetermined range of random numbers; an input device which starts a base game awarding a base game payout according to a given winning; a data storage device storing special game condition data which defines, within a given value range, a plurality of sub ranges respectively allotted to special game conditions or “No Special Game” meaning no special game is run, each of the special game conditions corresponding to a numerical value range and being associated with an average payout different from those associated with the other special game conditions; and, a controller programmed to perform the processes of: (a1) sampling the random number based on an input from the input device; (a2) running the base game using the random number, and awarding the base game payout according to a resulted winning; (a3) upon obtaining an arrangement of special symbols for triggering a special game in the base game, selecting one of the sub ranges allotted to one of the special game conditions or “No Special Game” based on the random number used in the base game and the special game condition data stored in the storage device, the selected sub range including the random number; and (a4) when a sub range allotted to any of the special game conditions is selected, running a special game under that special game condition and awarding a special game payout when a winning is achieved.