Normal sudoku rules apply. Digits along an arrow must sum to the digit in that arrow's circle. All low digits (12345) must be orthogonally connected with each other. Each 2x2 group of cells must contain at least one high digit (6789).
Normal sudoku rules apply. Digits along an arrow must sum to the digit in that arrow's circle. All low digits (12345) must be orthogonally connected with each other. Each 2x2 group of cells must contain at least one high digit (6789).