Viewtiful Joe Cheats

Enter it on the title menu, a sound should confirm the cheat code is activated.
Start a new game then select your character and difficulty.
(tested and working on the Japanese and European versions of the game)

Enter it on the title menu, a sound should confirm the cheat code is activated, after that, start a new game and then you will be able to select your new character & difficulty( This code will work with the american version ).