A non-transitory computer-readable medium storing a game program for a game which is played through a network causes a computer to realize a selection receiving function of receiving, from one user, the selection of whether to transmit a message to other user, an extraction function of extracting at least one other user to which the message is transmitted, on the basis of a certain condition, a message transmitting function of transmitting the message to the at least one other user extracted by the extraction function when the selection receiving function receives the selection indicating that the message is transmitted to the other user, and a reward giving function of giving a reward to the one user when the message transmitting function transmits the message to the at least one other user extracted by the extraction function.