It may come as a surprise to some but there is a lot of work involved in creating the puzzle files used in my Anatomy Puzzles, Art Puzzles, Map Puzzles, Poster Puzzles and Window Puzzles apps. All up it takes around 30 - 40 hours to create the 14 puzzles in a single pack. Here's a quick summary of the process used for each and every puzzle: First of all I need to search the web for interesting images that are: relevant to the pack being built, high enough resolution (at least 2000 pixels on the longest side), available for use in my apps (public domain or available under a suitable Creative Commons licence), and most importantly be interesting and beautiful. The above step alone can take some time and I will often search out at least 20 potential images for each pack - some don't make the grade in later steps. Next, I use the amazing iPad app "Procreate" with an Apple Pencil to: prepare the image - crop out unwanted portions, improve brightness if needed etc.