Press Run, Left, Left, Right, Right, I, II, I, II at the title screen. Then, use the following sequence to view the next image with each press: I, Left, Right, II, Up, Up, Left, II, Down, Right, II, I, Down, Up, Down, Run, II, I, Up, Run, I, Left, Right, Right, Up, Up, Up, Down, I, Left, Down, II, Run, Right, Down, Left, Right, I, Run.