Theme 2-21 (aka Mustache Lair) is one of the first levels you see a Mustache Pig. Although, the Mustache Pig that you see isn't a ordinary Mustache Pig, he is a Pig Boss known as Mr. Moustache. He is the official right-hand man of the King Pig in Poached Eggs. He appears once again in Mighty Hoax but sadly gets replaced by Mounting Moustache in Danger Above.  
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