Threes
- Killer cages
- Region sum lines
- Whisper lines
- Renban lines
The brief
Normal sudoku rules apply.
Killer: digits in cages must sum to the clue in the top left corner.
Renban: digits along the pink line are consecutive but in any order.
German Whisper: adjacent digits along green lines differ by at least 5.
Region Sum: for each blue line, digits on the line have an equal sum N within each box it passes through. If a line passes through the same box more than once, each individual segment of such a line within that box sums to N separately.
Modulo: Every three adjacent digits along the orange line must be drawn one from each modulo group: {1,4,7}, {2,5,8}, {3,6,9}.