Patent ID: 8622813

Claim:
A control method of a game system which comprises: (i) a plurality of first gaming machines which execute a first game for obtaining a first progressive bonus; (ii) a plurality of second gaming machines which execute a second game for obtaining a second progressive bonus; (iii) a memory which stores a first progressive value for the first progressive bonus and a second progressive value for the second progressive bonus; and (iv) a center controller which is inter-communicable with the pluralities of the first and second gaming machines via a network, wherein: the center controller is configured to execute the steps of: (a) receiving BET information pertinent to the first or second game from any of the gaming machines of respective ones of the first and second gaming machines; (b) updating the first or second progressive value stored in the memory, based upon the BET information received in the process (a); (c) when it is determined that the first and second progressive values stored in the memory satisfy a preset predetermined condition as a result of repeatedly executing the processes (a) and (b), merging the first and second games with each other to form a merged game, and adding up the first and second progressive values to form a merged progressive bonus; (d) randomly determining whether or not to award the merged progressive bonus in the process (c) to any of the gaming machines participating in the merged game in the process (c); and (e) awarding the merged progressive bonus to the gaming machine determined in the process (d), wherein the preset predetermined condition comprises each of the first and second progressive values reaching a predetermined value and the first and second progressive values being within a preset predetermined difference.