Residue of a Little Death
by FullDeck and Missing a Few Cards
Heartburn
- Modular lines
- Little killers
The brief
Standard sudoku constraints: Every row, column, and box must contain a complete set of the digits 1-9. Little killers: Numbers outside the box are the sum of the digits along the diagonal indicated by the arrow. Digits may repeat along little killers if allowed by other rules. Modular lines: Every set of three contiguous digits along a line must contain a complete set of residues modulo 3, i.e. one digit from {1,4,7}, one from {2,5,8}, and one from {3,6,9}. Digits may repeat on a line if allowed by other rules.