Normal sudoku rules apply. Cells separated by a king's move (in chess) cannot contain the same digit. Each main diagonal (marked in blue) cannot contain a repeated digit. Adjacent digits along the orange line must differ by at least 4.
Normal sudoku rules apply. Cells separated by a king's move (in chess) cannot contain the same digit. Each main diagonal (marked in blue) cannot contain a repeated digit. Adjacent digits along the orange line must differ by at least 4.