Here we go. .. Many hours later and I finally have something that is not only possible but doesn't take too much hard work to make -as long as you have a Cameo or Portrait, anyway! Other things you will need are some tiny sweets, something like Tic Tacs or Smints and some thick craft foam. Normally I am trying to find thin stuff but as this only has to be cut in strips, not a problem, scissors will do, or a rotary cutting blade.
This is what I came up with. (No sweets in this one yet!) The file is here
The card has a book style spine, to accommodate the thickness of the maze.
The first step is to cut out all the pieces. You need clear acetate for the window piece. I have used blue lines for the bits you need to draw rather than cut.
Take the puzzle base and adhere a thin strip of foam to the outside of the drawn line, leaving the gap at one corner for the sweets to be put in (temporarily open) and the permanent gap at the opposite corner for the sweets to come out. If you look at the photo, you can see I have a small piece of foam ready to close the input gap later. (You don't want to fill the card until you use it).
Add some foam 'arms' to help hold the sweets, in the top left corner and use more double sided tape to add bits of foam in a random way to stop the sweets from just sliding out by themselves. Add double sided tape to the top of the foam edge. You can choose any design you want for placement.
Once happy with the layout, put the tab Through the small cut in the window piece, fold a bit back and line it up with the gap in the arms. This stops the sweets from getting out before the puzzle is started. When the sweets are added, the tab should rest under them. Position as needed and seal the foam edges, to the window pane.On that bit, just add some tape to the card but leave the backing on.
Again, don't do what I did the first time and put it in the wrong corner (see, we bloggers get it wrong too!)
Once you have the puzzle you can assemble the card. Use DS tape again to attach to the main card and the same for the card insert, if using. Add whatever decorations you wish. Fill and close the maze with the last piece of foam.
As an alternative, you could use flat decorative buttons as the obstacles in the puzzle, or cut out fancy foam shapes with dies. Sadly, the Cameo won't cut foam thick enough for this. I have also seen cute wooden cut outs, they would be fun to use.
I added a frame, arrow and decorations to the front but you can choose your own design elements according to the occasion. This one is just a simple prototype, if making for a specific person it would be great to theme it with them in mind.