Press the following buttons on the folder menu (where it offers Mission Select and Multiplayer Mode).

Hold L&R and Press Right on +Pad
Hold L&R and Press Down on +Pad
Hold L and Press Up on +Pad
Hold L&R and Press Down on +Pad
Press Up C
Hold R and Press Up on +Pad
Hold L&R and Press Right on +Pad
Hold L and Press Left on +Pad
Press Down on +Pad
Hold L and Press Down C