King Clawdaddy's Sewer Castle
From the Super Mario Wiki, the Mario encyclopedia
Yoshi starts the level in a castle with some enemies and eventually gets to the next area, where a Checkpoint Ring awaits. Yoshi must traverse this area to reach yet another Checkpoint Ring and a pipe. This pipe takes him to an area with a Caged Ghost which must be shrunk down in order for the player to reach the boss door where King Clawdaddy awaits. After hitting him three times, the level is completed.
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