From the World Map, select a level so you are on the "Start? Yes / No" message. Hold [L] + [R] and enter the following codes:

While playing, split all of the Rocos apart in a safe place (or at a place where they will not fall). After awhile they will start to play with each other, "dogpile" the person singing the chorus, or line up in a line and count to the number of Rocos you have in Japanese.