Regionabner
- Kropki dots
- Region sum lines
The brief
- Normal 6x6 sudoku rules apply.
- Box borders divide the line into segments, none of which have identical or consecutive sums. Eg: if there is a segment with a sum of 10, no other segment anywhere on the line may have a sum of 9, 10 or 11.
- A black dot sits between two digits with a 1:2 ratio (one is double the other.) Not all possible black dots are necessarily given.