A game system includes a first game machine which operates according to a first architecture and, a second game machine which operates according to a second architecture different from the first architecture and has a processing capability lower than that of the first game machine. A game information storage medium stores, in addition to a first game program executable on the first game machine, a second game program executable on the second game machine and an emulator program that converts the second architecture into the first architecture. When a predetermined condition is satisfied while a first game according to the first game program is being executed on the first game machine, it is possible to execute a second game according to the second game program using the emulator program.