Revenge of the Shinobi [cheats]

Cheat Codes:
~~~~~~~~~~~~~~~~~~~~~~~
Open the "Stage Practice" Mode on the main Screen, where you can
practice any level that doesn't have a boss. Hold down the A, B and
C buttons, and press START at the Opening Screen.

30,000 Bonus Points:
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If you want to earn 30,000 bonus points, make sure you end a level
with eleven times more shurikens than the number of lives you have
left.

Extra Lives:
------------
One the second stage of level four,fire at the base of the first
conveyer belt.A special Musashi symbol will appear.Hop onto the
conveyor belt and let it carry you to the end.You lose a life but
you gain 2.Keep doing this until you have as many lives as you
want/need.

Infinite Shurikins:
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Go to the Options Screen, move the pointer up to Shurikins and set
them to 00, wait about 30 seconds (without moving the pointer). You
will here a sound and the ''00'' should change to an infinite symbol.
Start the game and you will have unlimited Shurikins.

Mystic Shield:
--------------
When you have the Weapons Upgrade item, walk and you'll notice the
shinobi holding a light on his wrist. This light is the Mystic Shield.
It will protect you against small projectiles like ninja stars and
bullets, but not against bigger ones like the grenades the soldiers
throw. Note: The shield is only activated when you walk.