"The Mystery of the Stone Circle": A stone circle vanishes.
"The Big Apple Christmas Caper": Sneef and Sniff succeed a mystery in New York City when all metal objects (cars, parts of skyscrapers, etc.) get pulled up by a giant magnet attached to an airship.
"Santa Needs Help": Santa Claus gets in trouble (Series Finale).
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Ready to Watch The Busy World of Richard Scarry, Season 3, Episode 13?