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Level 20 guide: Australia (medium)

A big country with an even bigger reef. A 7×7 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 20 About Australia

The board

Step by step

9 deductions lead to the 7 stamps. Each placed stamp also rules out its row, column, touching cells and the rest of its region.

1. The amber region has only one cell left: row 2, column 3. Place the stamp there.
2. The rose region can only hold its stamp in row 1, so every other cell in row 1 cannot hold a stamp (1 cell ruled out).
3. The green region has only one cell left: row 3, column 1. Place the stamp there.
4. The teal region can only hold its stamp in row 4, so every other cell in row 4 cannot hold a stamp (2 cells ruled out).
5. The periwinkle region has only one cell left: row 5, column 6. Place the stamp there.
6. The teal region has only one cell left: row 4, column 4. Place the stamp there.
7. The peach region has only one cell left: row 7, column 7. Place the stamp there.
8. The rose region has only one cell left: row 1, column 5. Place the stamp there.
9. The pink region has only one cell left: row 6, column 2. Place the stamp there.

Final solution