2026-09-19 daily answer

Step-by-step reasoning

1. Region 1 has only one safe cell left: R1C8.
2. R1C8 rules out cells in its row, column, color region, and touching neighborhood.
3. Region 4 has only one safe cell left: R4C7.
4. R4C7 rules out cells in its row, column, color region, and touching neighborhood.
5. Region 5 has only one safe cell left: R5C4.
6. R5C4 rules out cells in its row, column, color region, and touching neighborhood.
7. Region 7 has only one safe cell left: R7C2.
8. R7C2 rules out cells in its row, column, color region, and touching neighborhood.
9. Region 6 has only one safe cell left: R6C6.
10. R6C6 rules out cells in its row, column, color region, and touching neighborhood.
11. Region 3 has only one safe cell left: R3C9.
12. R3C9 rules out cells in its row, column, color region, and touching neighborhood.
13. Row 8 has only one safe cell left: R8C5.
14. R8C5 rules out cells in its row, column, color region, and touching neighborhood.
15. Row 9 has only one safe cell left: R9C1.
16. R9C1 rules out cells in its row, column, color region, and touching neighborhood.
17. Row 2 has only one safe cell left: R2C3.