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Mutant Muck Monster mistake.png

The Mutant Muck Monster is the toy Arthur gets from Grandma Thora in "Arthur's Toy Trouble." This toy was bought at David's Toys, and was found in the bargain bin, due to being a factory defect. The cost of this toy was $6.47, but Freddy K. said it would only be worth $5 after 10 years.

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