Bulldoku Level 540: Walkthrough & Solution
Step-by-step Bulldoku level 540 guide (9×9). One pup per color, row and column, no touching. Difficulty 50.6.
Play Level 540Step-by-step logic
1. Step: place pup (row 1, column 9)
After crosses, the cyan region has only one legal cell — row 1, column 9. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 1 2. Step: place pup (row 9, column 1)
After crosses, the coral region has only one legal cell — row 9, column 1. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 2 3. Step: place pup (row 8, column 8)
After crosses, the blue region has only one legal cell — row 8, column 8. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 3 4. Step: mark X in column 7
The orange region is confined to column 7. Mark illegal cells with X.
Board after step 4 5. Step: mark X in row 3
The mint region is confined to row 3. Mark X on cells in that row that belong to other regions.
Board after step 5 6. Step: mark X in row 3
The mint region is confined to row 3. Mark X on cells in that row that belong to other regions.
Board after step 6 7. Step: mark X in row 3
The mint region is confined to row 3. Mark X on cells in that row that belong to other regions.
Board after step 7 8. Step: mark X in row 3
The mint region is confined to row 3. Mark X on cells in that row that belong to other regions.
Board after step 8 9. Step: mark X in row 2
The pink region is confined to row 2. Mark X on cells in that row that belong to other regions.
Board after step 9 10. Step: mark X in row 4
The yellow region is confined to row 4. Mark X on cells in that row that belong to other regions.
Board after step 10 11. Step: mark X in row 4
The yellow region is confined to row 4. Mark X on cells in that row that belong to other regions.
Board after step 11 12. Step: mark X in row 4
The yellow region is confined to row 4. Mark X on cells in that row that belong to other regions.
Board after step 12 13. Step: mark X in row 4
The yellow region is confined to row 4. Mark X on cells in that row that belong to other regions.
Board after step 13 14. Step: place pup (row 5, column 7)
After crosses, the orange region has only one legal cell — row 5, column 7. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 14 15. Step: place pup (row 3, column 6)
After previous pups, row 3 has only one free cell — column 6. Place the mint region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 15 16. Step: place pup (row 4, column 4)
After previous pups, row 4 has only one free cell — column 4. Place the yellow region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 16 17. Step: place pup (row 2, column 3)
After previous pups, row 2 has only one free cell — column 3. Place the pink region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 17 18. Step: place pup (row 7, column 5)
After crosses, the green region has only one legal cell — row 7, column 5. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 18 19. Step: place pup (row 6, column 2)
After previous pups, column 2 has only one free cell — row 6. Place the lavender region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 19
Final solution
All pups placed correctly: R1 C9, R2 C3, R3 C6, R4 C4, R5 C7, R6 C2, R7 C5, R8 C8, R9 C1
Similar difficulty levels
FAQ
- How do I solve Bulldoku level 540?
- Follow the 19 steps above: find forced placements first, then mark impossible cells with X.
- Where can I play level 540 online?
- Click "Play Level 540" to open the free browser game with this exact board.