Unlike most of Konami's Bemani series, the Pop'n Music interface is not designed to represent any actual musical instrument. Instead, it uses nine buttons, each three-and-a-half-inches in diameter, laid out in two rows (since the location test of Wonderland, a multitouch panel is added). Five buttons are the bottom row, the other four being the top. Like in most Bemani games, color-coded notes (in this game called "Pop-kun" (ポップ君) and anthropomorphized with faces) fall from the top of the screen in nine columns that correspond to the buttons. When a note reaches the red line at the bottom of the screen, the player presses the button or tap the panel, which triggers a sound within the song.