Start a game and enter the main menu. There will be 12 items here, internally numbered 0 through 11 in consecutive order. Whenever you press A to enter a menu and then B to exit the same, it can contribute to entering one of the below cheats. Enter and exit the menus numbered below - which use the game's 0-11 numbering system (0 at the top, 11 at the bottom) - to denote which menus to enter, and then immediately exit. After entering/exiting all the named menus, press Start to apply the code: there should be a sound and message that will also occur. Note that you may advance the game one day by the use of these cheats.
Use these passwords to start the game using other countries. Enter the Japanese characters noted in the Row X, Column X.