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Level 22 guide: Peru (hard)

High Andes, deep history and perfect potatoes. 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 22

The board

Step by step

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

Final solution