Press Up(2), Down(2), Left, Right, Left, Right, B, A at the title screen. The sound of a basketball will confirm correct code entry. "Options" at the mode select screen. Select "Rules/Difficulty", then "Level". Choose the "S" option to play at the "Super" difficulty setting. An "S" will appear next to level to confirm correct code entry.

Alternatively, press Up(2) Down(2), Left, Right, Left, Right, A, B, A or press Up(2), Down(2), B, A at the title screen.