2026-07-18 daily answer

Step-by-step reasoning

1. Region 1 has only one safe cell left: R1C5.
2. R1C5 rules out cells in its row, column, color region, and touching neighborhood.
3. Region 2 has only one safe cell left: R2C2.
4. R2C2 rules out cells in its row, column, color region, and touching neighborhood.
5. Region 5 has only one safe cell left: R5C8.
6. R5C8 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 8 has only one safe cell left: R8C4.
10. R8C4 rules out cells in its row, column, color region, and touching neighborhood.
11. Column 3 has only one safe cell left: R4C3.
12. R4C3 rules out cells in its row, column, color region, and touching neighborhood.
13. Row 3 has only one safe cell left: R3C9.
14. R3C9 rules out cells in its row, column, color region, and touching neighborhood.
15. Row 7 has only one safe cell left: R7C1.
16. R7C1 rules out cells in its row, column, color region, and touching neighborhood.
17. Row 9 has only one safe cell left: R9C7.