An objective is to provide a game system and information storage medium which can improve the operating rate of a game center and realize a more effective management therein. The game system includes a host machine and a plurality of game machines. The host machine is designed to detect the current time or date and to perform allocation of games to the game machines G1 to G9 based on the detected time or date. Transfer data for a player to play a game by means of each of the game machines is then transferred to each of the game machines according to the allocation. A manager of the game center sets schedule data representing how the allocation is carried out according to the time or date. The allocation of games to the game machines may depend on time periods, date or a traffic line of players. Adult games may be set to be played only in the nighttime. Game sound volume and screen brightness may be changed and set based on the time or date.