To do this, first go to the menu. Then type in square, square, circle, circle, square, square, circle, circle. The following will appear: "Type: 0 Msg: 0". Pressing up begins to scroll through lines. The type number corresponds to the character, the message number corresponds to which line. You can only press up to change the message, not type, so you have to scroll through all of one character's lines before reaching the next character. To exit you must re-enter the code. The level's original music will be switched to whatever line you left it at. This will loop repeatedly until you enter another level, hub or area.