I think this is a great idea! I would love to be able to mark which puzzle I am working on. And if you have the ability for us to load pics as we progress though the puzzle, it would be really cool to see how others solve their puzzles.
Thank you so much for creating this puzzle app! Even if I never trade, sell, or buy a puzzle, I love that I can keep track of the puzzles I own (in a searchable way), and even if I have completed it! So much better than Pinterest!!