Hint 1 : It's on page 8.
Hint 2 : The octagon is red.
Hint 3 : It comes in the form of a roadsign.
The cat is riding a yellow bike at the top of the page
on the photos towards the bottom left of page 22
It's a rooster spur! Look for the white rooster inside the clear marble.
There are many HEV configurations and design options that can be grouped in three categories: series (range-extending HEVs), parallel (power assist HEVs), and dual-mode HEVs.
Go back and forth from page to page, doing one problem on one page and then going to the other page to do one, then back to the first page, then back to th second page, and so forth. When you are finished, both pages will be done!
It's the stop sign on the left page. I just looked it up because I was stuck on it too.
It is on the camel stamp on the left page
I think it is on the side of the can on the bottom right hand page.
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.
The rabbit on the Spy Extreme Challenger book is on page 24, in the bottom right corner of the page. It can be found hiding amongst the bushes. On page 25, there is no rabbit hidden in the picture.
The bell is a jingle bell. It is in the top left corner.
It's in the crown on page 26
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.
its behind the elephant on page 25
in the blue ball next to the bump sign on page nine near the bottom
The camera is sort of by the hammer. It's by the paints.