Invincibility:
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Choose BMG selection on the options menu, then, press B to select the
following songs in order.
Code Effect :
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He runs, Japonesque, shinboi walk, sakura, getufu Invincibility
Unlimited Shurikens:
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Set the amout of shurikens to 0 on the options menu, Set the sounds effects
option to Shuriken. Highlight the shurikens option and keep it there and
the 0 will change into the symbol for infinity.
Bonus Points:
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Complete a level without throwing any shurikens to get 30, 000 bonus points.