Continue
After losing your last life, hold A and press START at the title screen to continue where you left off.
Swing sword
Press A + B and any direction on the D-pad.
Special bonus level
Walk around the screen in a counter-clockwise circle and touch each corner. Blue hearts are worth 100,000 points during the special bonus level.
10 million points
Intentionally die in levels 1-3, 2-2, 3-2, 3-4, 4-1, 5-1 and not in any other level.