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Level 18 guide: South Korea (hard)

Spicy, neon and quietly traditional. A 9×9 board. Colors are named in the steps below, and rows and columns are counted from the top left starting at 1. This guide spoils the solution, so try the level first.

Play level 18 About South Korea

The board

Step by step

14 deductions lead to the 9 stamps. Each placed stamp also rules out its row, column, touching cells and the rest of its region.

1. The periwinkle region has only one cell left: row 5, column 3. Place the stamp there.
2. The amber region can only hold its stamp in column 1, so every other cell in column 1 cannot hold a stamp (6 cells ruled out).
3. The mint region can only hold its stamp in column 2, so every other cell in column 2 cannot hold a stamp (4 cells ruled out).
4. The rose region has only one cell left: row 1, column 4. Place the stamp there.
5. The amber region has only one cell left: row 2, column 1. Place the stamp there.
6. Column 9 can only hold its stamp in the pink region, so the other cells of the pink region cannot hold a stamp (6 cells ruled out).
7. The green region and the teal region must all put their stamps in rows 3 and 4, so every other cell in rows 3 and 4 cannot hold a stamp (3 cells ruled out).
8. The peach region can only hold its stamp in column 5, so every other cell in column 5 cannot hold a stamp (4 cells ruled out).
9. The green region has only one cell left: row 3, column 6. Place the stamp there.
10. The teal region has only one cell left: row 4, column 8. Place the stamp there.
11. The stone region has only one cell left: row 9, column 7. Place the stamp there.
12. The peach region has only one cell left: row 7, column 5. Place the stamp there.
13. The mint region has only one cell left: row 8, column 2. Place the stamp there.
14. The pink region has only one cell left: row 6, column 9. Place the stamp there.

Final solution