For my last project at Metis I decided to use computer vision to solve KenKen puzzles. Currently this application only accepts 4x4 KenKens. Simply upload a puzzle and get the solution. This was untested for photos taken with a camera but it should work with proper lighting and if the shot was taken at a perpendicular angle (there is no polygon correction in my app). To learn more about this project check out my blog or my Github.Enjoy!