Abstract: A game system is has at least three game devices (2A to 2D). Each game device (2A to 2D) executes a program to enable a player to play a game, and the processor (21) thereof identifies at least two game devices (2A to 2D) that will participate in a game before starting the game. Processor (21) also generates game information (score information and an attack identifier) corresponding to progress of a game that is being played, and transmits, by means of a communication interface (22), the generated game information to each of the above two or more game devices (2A to 2D), while processor (21) receives game information generated at each of the at least two game devices (2A to 2D) and causes changes in game situations based on the received game information.