Sudoku and crossword puzzles are popular mental exercises that enhance cognitive skills differently. Sudoku improves ...

Brad Sigmon is set to be killed by a firing squad in South Carolina following his conviction 24 years ago for brutally ...

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 ...