Cross About Dominoes
by FullDeck and Missing a Few Cards
Indigestion
- Killer cages
- Diagonal class lines
- Modular
- Unimodular
The brief
Normal sudoku rules apply: every row, column, and 3x3 box must include a complete set of the digits 1-9. Killer cages: digits within cages marked by dashed lines must sum to the number shown in the upper left corner of the cage. Every diagonal of length 7, 8, or 9 is either modular or unimodular. On modular lines, every set of three sequential digits contains one digit from {147}, one from {258}, and one from {369}. On unimodular lines, all digits are from the same class (all from {147} or all from {258} or all from {369}).