Modular Lines 2
- Killer cages
- Modular lines
The brief
Standard sudoku constraints: Every row, column, and box must contain a complete set of the digits 1-9.
Killer cages: digits in cages cannot repeat and must sum to the number shown in the upper left corner of the cage.
Standard sudoku constraints: every row, column, and box must contain a complete set of the digits 1-9.
Killer cages: Digits in a cage indicated by a dashed line cannot repeat and must sum to the total shown in the upper left corner of the cage.
Modular lines: every set of three sequential 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 on two-cell lines cannot be from the same residue set. Digits may repeat on a line if allowed by other rules.