DecapAttack: Round 4: Armington
1Arm Washington seems to have an even bigger emphasis on swimming underwater. Probably because the island seems to have a huge body of water shaped like a weird fly or bird.
BTW, 4-2's theme is probably the best main theme in the entire game! You will get to hear it a couple more times beyond that point!
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In 4-3, you the missing item for this Round is simply a key. Once you've gotten far enough, you will face a strange alien boss. A blob that emerges from a floating, red, fleshy-looking pod. Ugh... and when you do enough damage to him, the pod turns into an unpleasantly-dark shade of brown...
The blob can only be hurt when you see him, but this will also when he'll unleash mini-blobs to chase after you. Once he changes colors, he'll do this much faster!