I came to the forums now to look for a list of the hidden gifts, to see if I had missed any.
There is not a forum entry on this that I could find!
The only ones I found are on the last screen of challenge 3, the city. You are asked to go to six stores, which each have a green front door.
In each store there are moveable items, and a matching number of spaces that are marked with a special graphic. You get a small reward for moving the items to cover the spaces.
This is shown in the walkthrough maps linked here.
Any others to share?
