Jigsaw Center Dot Kropki Sudoku
Sudoku with consecutive or double dots between neighbours. Irregular regions replace the square boxes; each region holds every digit once. The nine central cells of the boxes must contain every digit once.
Controls
Solve the sudoku. A white dot means neighbours differ by 1; a black dot means one is double the other. No dot means neither relation holds.
Logic · Numbers · Deduction · Grid
Brain training · PuzGo