India, Sept. 9 -- The humble 9x9 Sudoku grid is finding new takers among Delhi's youngsters. The logic puzzle, in which players fill a grid so every row, column and 3x3 box contains the numbers 1 to 9 without repetition, is becoming a way to take a break from social media. On International Sudoku Day today, enthusiasts share how the game is helping them step away from their phones....