Level Select
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At the title screen just press left or right on the D-pad and
the level select will show up on the lower left hand side of
the screen. You can now select levels 1-6.

Invincibility (Japanese version)
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Pause your game and press X. The word "Muteki" will appear on
the life gauge to confirm correct code entry. REMEMBER: "Muteki" is
"Invincible" in Japanese.