Sudoku Anti-Diagonal - 500 Sudoku Puzzle
Place numbers (1 to 9) in the grid.
Every row, column and 3x3 box must contain the numbers 1 to 9.
Each main diagonal must contain only three different digits.
Nr. 1 - 100 = easy
Nr. 101 - 200 = medium
Nr. 201 - 500 = hard