2026-08-21 daily answer

Step-by-step reasoning

1. Region 1 has only one safe cell left: R1C3.
2. R1C3 rules out cells in its row, column, color region, and touching neighborhood.
3. Region 3 has only one safe cell left: R3C2.
4. R3C2 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 4 has only one safe cell left: R4C4.
8. R4C4 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. Row 7 has only one safe cell left: R7C1.
12. R7C1 rules out cells in its row, column, color region, and touching neighborhood.
13. Row 8 has only one safe cell left: R8C7.
14. R8C7 rules out cells in its row, column, color region, and touching neighborhood.
15. Row 2 has only one safe cell left: R2C5.