Zippularity
by FullDeck and Missing a Few Cards Open on SudokuPad
Heartburn
- Killer cages
- Zipper lines
- Modular lines
The brief
- Standard sudoku rules apply: The digits 1 through 9 appear in every row, column, and box. - All lines are both Zipper AND Modular lines. - Zipper Line: Along Zipper lines, pairs of digits equidistant from the center of the line have the same sum. For Zipper lines of odd length, that sum is the central digit on the line. - Modular lines: Any set of three adjacent digits along a modular line has three different remainders when divided by 3. - Cages: Digits in cages cannot repeat and must sum to the value shown in the upper left corner of the cage.