Normal sudoku rules apply. Starting in a corner, along the grey stairs the difference between the first pair of digits is at least 2, the next pair at least 3, then at least 4 etc. Moreover the first and last digits are equal.
Normal sudoku rules apply. Starting in a corner, along the grey stairs the difference between the first pair of digits is at least 2, the next pair at least 3, then at least 4 etc. Moreover the first and last digits are equal.