Nine Objects:
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Go to the main „press start” menu screen and type in this
code UP, DOWN, UP, DOWN, B, A, if the code is entered correctly
you shall hear a short noise.
Become Invincible:
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Go to the main „press start” menu screen and type in this code
L, L, L, R, R, R, RIGHT, RIGHT if the code is entered correctly
you shall hear a short noise.
Infinite Lives:
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At the main „press start” menu type this code B, B, A, A, LEFT,
RIGHT, DOWN, UP, if the code is entered correctly you shall hear
a short noise.
Enemies have health meters:
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At the main „press start” menu type this code Up, Right, Up, Left,
Down, Right, Down, Left.