Modouble
by FullDeck and Missing a Few Cards Open on SudokuPad
Heartburn
- Double arrows
- Modular
The brief
- Normal sudoku rules apply. - Double arrows: Digits along a line sum to same total as the digits in the circles connected to the line. - Modular lines: Every set of three adjacent cells along a modular line contains digits with three different remainders when divided by 3. In this puzzle, every double arrow ALSO forms a modular line, including the attached circles.