Alternate Route
( you need a Blue shell for this) In the mini-castle in World-1 go into the door after the pipe cannon. When you're in the door jump to the other one but don't go in instead jump up to the part of the stones where there is an opening to the right. When you go in there will be a yellow pipe and some blocks. You have to use the blue shell to destroy the blocks and get under the narrow passageway. Then destroy the blocks in front of the not yellow pipe. Go in and there will be a red flag instead of the black one and you won't fight the boss. This takes you to a cannon to World-5. This takes a chunk out of Mario/Luigi's mission.
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