A game program causes a computer to set, if it is determined that a point based on a first action of the character of each of an own player and another player is greater than or equal to a predetermined value, a specific period from a time when an instruction to input a second action has been first accepted from the own player or the other player as a cooperation accepting period, to accept the instruction to input the second action up to a maximum number of times set for each cooperation player from a cooperation player other than the player who has instructed input of the second action, among the own player and the other player, during the cooperation accepting period, and to vary an effect of the second action in accordance with the number of times of the instruction to input the second action.