During the title screen, press x4, x3, x4, . A new title screen will appear and a mini game will be available in the main menu.
During the title screen, press x7, x7, x7, . A new title screen will appear and two mini games will be available in the main menu.
See the main page for Crayon Shin-chan - Taiketsu! Kantamu Panic!! (クレヨンしんちゃん 対決!カンタムパニック!!)