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Extra lives
If you're struggling with the fact that this game is darn nasty or if you just like killing frogs, this code should be a bonus. When you start the game get the gun that gives you a spread of forty bullets. Continue to the first waterfall on the right, destroy the frog in your path to the second long ladder. Get the gun next to the ladder and continue to the right. There should be an opening in the floor. Plunge through this and go down the ladder. Now, go left, kill the frog, run back to the right and repeat this process. Once you've mutilated the seven frogs, a sound should ring, and you should have five extra lives. So for every seven frog lives taken you receive five lives. It doesn't seem fair but it works.