Defeat Iguana King
To defeat the Iguana King (the first boss) use the Bakudan ( Little guy with bomb) power to blow up the force field thing.
Then get in close and use your claws on him but becareful because he can still hit you.
Repeat this and put in 1 or 2 Electric bomb to stop him for a moment and then he should be gone.
We have more cheats and tips for this game here, Scaler cheats
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