International Superstar Soccer Deluxe Dog mode
At the title screen, press Up(2), Down(2), Left, Right, Left, Right, X + Circle. If you entered the code correctly, you will hear the sound of a dog barking. Then the referee and linesman will be dogs when the next match begins.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original