Diagonal Sudoku is a version of Sudoku with a 9 by 9 field including 81 squares. You have to fill the grid and make sure each row, column, and 3x3 subgrid must contain 1 to 9 once. Both main grid diagonals must contain 1 to 9 exactly once. More clues and a simpler game result from this rule. Diagonal Sudoku is hard and accessible for all skill levels because to its unique twist. Players can play this fun puzzle online anytime, anywhere.