Bionic Commando - Platform: Gameboy Color

Exit level
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Hold Select and press A + B during game play. 

Full ammunition
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Hold Start and press A + B during game play.

Unlimited lives
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A map screen will appear between levels. Move your character 
around until you run into an enemy unit. Battle the unit until 
you defeat the tank at the end. After you destroy the tank, an 
extra life icon will appear. Collect it and exit the level. 
You can repeat this until you have a total of eight lives.