Making the App - work in progress II

Here is the puzzle ready to use in the app. It still do have all the piece in as I just created the whole thing, which at a later date will be edited so that it demonstrates different stages of the puzzle.

The difference with this puzzle is that the actual pieces disappear when the piece is put in place and the 'shadow' piece turns transparent reveling that part of the image. This is so it creates a much better final image that doesn't have the outlines of the pieces shown as you can see in the earlier puzzle.