Simple to use. Go to the site to access the expanding library of jigsaw puzzles created by others. You can search for puzzles based on a theme, by puzzle difficulty (easy is 60 pieces or less and challenging puzzles have 240 plus pieces). In the puzzle work space, you can zoom in or out to give yourself more room to work. The 'full screen' mode removes other distractions and helps to focus on the challenge at hand. The site requires the Flash plug-in to make the puzzles interactive.
If you create an account (it's free) you can upload your own images to make your own jigsaw puzzles to share. This will also remove ads from the puzzle pages. The tool does not require an email address to register.