TWI321058B

In a game device that can be played by a plurality of players at the same time, playing of a game by more than the plurality of players assumed to be playing the game device is prevented. A setting for a number of a plurality of players to participate in the game is received and the game takes place using the set number of the plurality of players. The players constituting the plurality of players participating in the game is then detected during the game. The detected number of the players and the set number of the players are then compared, and the difficulty level of the game is changed when the detected number of players exceeds the set number of players. For example, continuation of the game is made difficult by increasing the difficulty level, and the time for which a cheating can take place is shortened. Further, the game can be made less interesting by lowering the difficulty level, and the time for which a cheating can take place can be made shorter.