Normal sudoku rules apply; for 1-8, each marked number N appears N cells away in either a horizontal or vertical direction (not both). 9’s obey the king’s move constraint, both as regards each other and marked 9’s.
Normal sudoku rules apply; for 1-8, each marked number N appears N cells away in either a horizontal or vertical direction (not both). 9’s obey the king’s move constraint, both as regards each other and marked 9’s.