Cybernator - Platform: Super Nintendo

Six continues
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Hold Up + L + R, and press Start at the Konami screen. 

Nine continues
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Hold L + R and press Start(5) at the title screen. 

Unlimited napalm
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Walk through the first mission without shooting or 
hitting any targets. Your score should be 0 points. 
Defeat the Boss without shooting its side gun turrets. 
Your score should be 2800 points. When the asteroid 
level begins, press X to change weapons until the 
unlimited napalm gun is selected. Survive this mission 
to keep the unlimited napalm for the remainder of the 
game. Note: It cannot be powered up. 

Hint: Failed ending
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Go through the first level, and do not destroy the Boss. 
Finish the rest of the game to see the failed ending in 
which everyone dies.