I Spy Ultimate Challenger: A Book of Picture Riddles
I Spy Gold Challenger: A Book of Picture Riddles
I Spy Super Challenger
I Spy Extreme Challenger: A Book of Picture Riddles
I Spy Fun House: A Book of Picture Riddles
I Spy Mystery: A Book of Picture Riddles
I Spy Fantasy: A Book of Picture Riddles
I Spy Treasure Hunt: A Book of Picture Riddles
I Spy School Days: A Book of Picture Riddles
I Spy Spectacular: A Book of Picture Riddles