Patent ID: 9576432
Date: 2017-02-21
CPC Classifications: G07F

Claim:
1. A gaming machine comprising: a display device configured to display arrangements of symbols, each arrangement of the symbols selected from a set of symbols; a memory configured to store a plurality of tables defining the set of symbols, symbol codes for the set of symbols, winning combinations of the set of symbols, probabilities of the winning combinations, and mapping information between the symbol codes and random numbers; an item entry by which value to be bet can be added to the gaming machine; a validator; a payout mechanism configured to pay out gaming media; and a controller configured wherein the normal round is executed with a first symbol set including a plurality of symbols, the first-type free round is executed with a second symbol set that includes at least one first symbol in addition to the symbols in the first symbol set, the second-type free round is executed with a third symbol set that includes at least one second symbol in addition to the symbols in the first symbol set, the at least one second symbol being different from the at least one first symbol, a first number of the first-type free rounds are successively executed when a first condition is satisfied in the normal round, and a second number of the second-type free rounds are successively executed after the execution of the first number of the first-type free rounds are finished when a second condition is satisfied in the first-type free rounds.