Bat
- Anti-knight
- Kropki dots
- Region sum lines
The brief
Normal sudoku rules apply.
Digits along the blue line sum to the same value in each 3x3 box the line passes through (if the line visits a box multiple times, each visit is counted as a separate sum).
Digits along a red line must differ by at most 3.
Digits separated by a white dot must be consecutive. Digits separated by a black dot must be in a 1:2 ratio. Not all dots are given.
Cells separated by a knight's move cannot contain the same digit.