Killer sudoku is similar to the other levels in that each of the numbers 1-9 must fit into each 9-by-9 square. No number can be repeated more than once in the square or in a horizontal or vertical row ...

Life sometimes feels like a puzzle. We tackle the world, moving left, right, forward and backwards just to be able to find ...

Learn how this game, along with daily brain workouts and a healthy lifestyle, can boost memory and sharpen cognitive skills ...

The Daily Memphian now offers readers all four sudoku puzzle difficulty levels every day. Keep scrolling for easy, medium, hard and killer sudokus. Need more to satisfy your sudoku craving? Not sure ...