Rhyming text leads the reader to find objects hidden in the photographs.

Following up on the great success of "I Spy Super Challenger" and "I Spy Gold Challenger"--with combined sales of more than 800,000 copies--"I Spy Extreme Challenger" is even harder and more fun than readers can imagine. Toys, animals, food, and utensils are just some of the hidden objects to find.

Rhyming text leads the reader to find objects hidden in the photographs.