1. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box, the boxes should find out by solver;
2. Kropki Rules: A black dot between cells indicates cell values with a 2:1 ratio, A white dot between cells indicates cells with consecutive values. And the two cells adjacent to the dot do not belong to the same box, Not all dots are given;
3. The n×n regions marked with dotted line should fill with n numbers from 1~9, and it should be exactly divided into n parts with n cells like a small jigsaw sudoku.
Here are some examples:
Penpa link.Have fun solving!
Solution code: The Row 1 of all the sudoku, big to small, 18 digits and separate with "/", like"*********/****/***/**"
on 3. September 2024, 17:24 by marcmees
great construction. thanks.