A non-transitory computer readable game medium storing instructions for controlling an operation of a game system. The game system includes a head mounted display (HMD); a processor; a memory; and an input reception device capable of detecting a physical movement of a user. The processor is configured to cause the HMD to display a virtual reality space for forming a game. The processor is configured to cause the HMD to display, in the virtual reality space, a moveable object to be operated by the user in association with the physical movement of the user detected by the input reception device. The processor is configured to give a disadvantage to a player in the game in response to the physical movement of the user exceeding a predetermined velocity in comparison to a case in which the physical movement of the user is equal to or less than a predetermined velocity.