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Blaster Master GameShark Codes
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In order to unlock more tanks beat the first Boss, After defeating the Boss you will be rewarded with 3 more special tanks:
Deastroyer
Special:shoots 2 homing missiles
Defender
Special:puts a forcefield around the tank
Voltorbage
Special:shoots 2 streams of energy
Complete the game and 'Save' then select 'Sophia III' when the Main menu appears again. The battle vehicle will now have an alternate appearance.