World 6 (New Super Mario Bros.)
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Mario & Luigi, aftr defeating Petey Piranha, traveled on to World 6. It had 2 towers. No ghost house this time though. The castle, at the end, came after a level infested with Chain Chomps, Koopas and Warp Pipes.
The boss is Monty Tank, and he fires Bullet Bills at Mario or Luigi. He may pop out to throw a Bob-omb into the mix.