Game system and computer readable information storage medium storing a computer program therefor

A non-transitory computer readable information storage medium storing a computer program for a game system which is configured so that one of a plurality of payment methods is selected to pay a game play fee, the computer program making a computer function as:

• a determination device which determines which payment method the game play fee has been paid by;
• and
• a game control device which controls a game so that modification is generated depending on the payment method based on a determination result of the determination device, wherein
• the game control device controls the game so that the modification is generated depending on the payment method in such a way that, in a case that the game play fee is paid by a specific payment method, a range of game is made available for play, the range being unavailable for play in a case the game play fee is paid by another payment method.