2026-10-31 daily answer

Step-by-step reasoning

1. Region 1 has only one safe cell left: R1C9.
2. R1C9 rules out cells in its row, column, color region, and touching neighborhood.
3. Region 3 has only one safe cell left: R3C7.
4. R3C7 rules out cells in its row, column, color region, and touching neighborhood.
5. Region 4 has only one safe cell left: R4C1.
6. R4C1 rules out cells in its row, column, color region, and touching neighborhood.
7. Region 6 has only one safe cell left: R6C6.
8. R6C6 rules out cells in its row, column, color region, and touching neighborhood.
9. Region 5 has only one safe cell left: R5C8.
10. R5C8 rules out cells in its row, column, color region, and touching neighborhood.
11. Region 8 has only one safe cell left: R8C2.
12. R8C2 rules out cells in its row, column, color region, and touching neighborhood.
13. Row 7 has only one safe cell left: R7C4.
14. R7C4 rules out cells in its row, column, color region, and touching neighborhood.
15. Row 9 has only one safe cell left: R9C5.
16. R9C5 rules out cells in its row, column, color region, and touching neighborhood.
17. Row 2 has only one safe cell left: R2C3.