Hyper Diagonal Kropki Sudoku
Sudoku with four extra windows, both diagonals and Kropki dots.
Controls
Fill every row, column and 3×3 box with the digits 1–9. The four shaded 3×3 windows and both main diagonals must also contain 1–9 exactly once. A white dot means the neighbouring digits differ by 1; a black dot means one digit is double the other. If no dot is shown, the two digits are neither consecutive nor double.
Logic · Numbers · Deduction · Grid
Brain training · PuzGo