A compilation of twelve search-and-find photographs culled from the eight original I Spy books with "challenging" new riddles.More than 100,000 copies of I Spy Ultimate Challenger have been sold in hardcover.

I Spy: Ultimate Challenger: Ultimate Challenger 2005, Cartwheel Books, New York, NY

ISBN-13: 9780439787277

Reinforced Library edition

Hardcover

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