The snail is right by Harry's Test. It's the shell next to it.
The snail is by the rabbit and the book with WHAT HARRY FOUND OUT.
One is on a pencil!
The snail on pages 14-15 of the I Spy Extreme Challenger book is located near the top middle of the page, slightly to the right of the center. Its shell is partially hidden behind a plant, but you can see part of its body extending out. It may be a bit tricky to spot at first glance.
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It is on the camel stamp on the left page
The ace in the "You Spy Extreme Challenger" game is located under the magnifying glass on the right side of the card. It is hidden within the design of the magnifying glass.
In the bottom left corner on top of the musical scale and the scissors.
In the Spy Extreme Challenger game, the lunchbox can be found in the living room cabinet. It is hidden behind the blue vase on the middle shelf.
They are the hotdog buns on the two forks in the middle of the page.
Theres a mouse trap with a spring on Page 25.
I think it is on the side of the can on the bottom right hand page.