I have 2 layers. The background is a puzzle - just a blank puzzle with only the outlines of the pieces showing. The 2nd layer is a picture I took. I want to reveal the picture one puzzle piece at a time, saving the image each time. It is meant to show progression, like using a thermometer but way cooler. Just to clarify, I did it before with a friend over Skype for 2 hours, but now can't for the life of me remember how to "remove" a puzzle piece and I won't take up her time again. The image below is jpg because of the allowed file size here. Thanks.