Video game system, video game program, and video game device

摘要

A video game device 10 is capable of receiving both a first storage medium and a second storage medium at the same time. The video game device 10 performs a first game process using first save data. The video game device 10 performs a second game process using second save data. The video game device 10 overwrites the first save data based on the status of the second video game. The video game device 10 overwrites the second save data based on the status of the first video game.