Box Twist
- Killer cages
- Modular lines
The brief
Normal sudoku rules apply. Each row, column, and box must contain a complete set of the digits 1-9.
Normal killer cage rules apply: digits in cages cannot repeat and must sum to the number 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 may repeat on a line if allowed by other rules.
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