Actually, we do plan on updating all of the old versions with 20x20 puzzles, but you need to understand that creating and testing the puzzles is actually a lot of work. We are a very small shop (literally a 'mom & pop' shop) and we have a lot on our plate so it will take a while to get it done. We have done Zoo and Museum, and are currently working on Nature. We will post on Facebook as they become available.