Explore our full range of puzzles, from easy to extremely hard. Whether you're a beginner or an expert puzzler, our 5-level difficulty system helps you choose the right puzzle based on your experience and desired challenge. The difficulty of a given puzzle is usually relative to the person solving it. We rate our puzzles on a scale of 1 (easiest) to 5 (hardest) based on our own experience solving them and our observations of how others solve them. The rating implies how long it takes most people to solve the puzzle the first time and how hard it is to memorize and recall the solution in the future.