Let's Play Super Mario Bros. 3 - Part 9: Giants' Causeway
Continuing with World 4, we find lots of items and not very many levels. Yeah, this one only goes up to 6, and it definitely should have been at least 7 or 8. It's not like they didn't have room for more levels on the map. We have some pretty decent gimmicks this time around, though. 4-5 introduces Missile Bills, which are Bullet Bills that can turn around to go back toward you. (Actually, this is the _only_ level containing them, and they're not that common in the rest of the Mario series either.) 4-6 has doors that take you from a giant version of the level to a normal-sized version (well, only some things actually change). The second fortress is fairly short, most of it consisting of platforming over Donut Lifts. The World 4 airship, meanwhile, is based mostly on the flamethrower cannons. Iggy Koopa is nothing special (and is apparently named after Iggy Pop).
With four worlds finished, we are basically halfway through the game, unless you go by individual level count.
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