Patent ID: 7662041

Claim:
A game system including a first storage medium, a second storage medium, and a first game machine in which both said first storage medium and said second storage medium can be simultaneously inserted, wherein said first storage medium comprises a writable and nonvolatile first storing location, and a second storing location for storing beforehand first image data and a first game program for executing a game process by using at least one of said first image data and first additional image data stored in said first storing location, said first additional image data having the same format as that of said first image data but representing an image different from that of said first image data; said second storage medium comprises a third storing location for storing beforehand second image data, a second game program for executing a game process by using said second image data, and second additional image data, and a writing program for writing said second additional image data into said first storing location in said first storage medium as said first additional image data, and said first game machine comprises: first determining programmed logic circuitry for determining whether or not both of said first storage medium and said second storage medium are simultaneously inserted; executing programmed logic circuitry for executing said writing program stored in said third storing location in said second storage medium when said first determining programmed logic circuitry determines that both of the media are inserted simultaneously; and adding programmed logic circuitry for reading said second additional image data from said third storing location in said second storage medium and writing the read data to said first storing location in said first storage medium by executing said writing program by said executing programmed logic circuitry, and operation data acquiring programmed logic circuitry for acquiring operation data from an operating controller being operated by a user, wherein said first game program executing said game process by using one image data selected by said operation data out of said first image data and said first additional image data.