Bulldoku Level 531: Walkthrough & Solution
Step-by-step Bulldoku level 531 guide (9×9). One pup per color, row and column, no touching. Difficulty 50.3.
Play Level 531Step-by-step logic
1. Step: place pup (row 1, column 6)
After crosses, the cyan region has only one legal cell — row 1, column 6. 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 5, column 5)
After crosses, the orange region has only one legal cell — row 5, column 5. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 2 3. Step: mark X in column 8
The mint region is confined to column 8. Mark illegal cells with X.
Board after step 3 4. Step: mark X in column 8
The mint region is confined to column 8. Mark illegal cells with X.
Board after step 4 5. Step: mark X in column 8
The mint region is confined to column 8. Mark illegal cells with X.
Board after step 5 6. Step: mark X in column 8
The mint region is confined to column 8. Mark illegal cells with X.
Board after step 6 7. Step: place pup (row 9, column 9)
After crosses, the coral region has only one legal cell — row 9, column 9. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 7 8. Step: place pup (row 8, column 4)
After crosses, the blue region has only one legal cell — row 8, column 4. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 8 9. Step: mark X in column 7
The green region is confined to column 7. Mark illegal cells with X.
Board after step 9 10. Step: logical elimination
Placing a pup on the trial cell would leave a region with no legal move. Mark that cell with X.
Board after step 10 11. Step: logical elimination
Placing a pup on the trial cell would leave a region with no legal move. Mark that cell with X.
Board after step 11 12. Step: logical elimination
Placing a pup on the trial cell would leave a region with no legal move. Mark that cell with X.
Board after step 12 13. Step: mark X (line reservation)
Several regions share the same rows or columns — other cells on those lines are impossible. Mark them with X.
Board after step 13 14. Step: logical elimination
Placing a pup on the trial cell would leave a region with no legal move. Mark that cell with X.
Board after step 14 15. Step: place pup (row 6, column 1)
After previous pups, column 1 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 15 16. Step: place pup (row 4, column 3)
After crosses, the yellow region has only one legal cell — row 4, column 3. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 16 17. Step: place pup (row 2, column 2)
After previous pups, column 2 has only one free cell — row 2. 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 3, column 8)
After crosses, the mint region has only one legal cell — row 3, column 8. 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 7, column 7)
After previous pups, row 7 has only one free cell — column 7. Place the green 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 C6, R2 C2, R3 C8, R4 C3, R5 C5, R6 C1, R7 C7, R8 C4, R9 C9
Similar difficulty levels
FAQ
- How do I solve Bulldoku level 531?
- Follow the 19 steps above: find forced placements first, then mark impossible cells with X.
- Where can I play level 531 online?
- Click "Play Level 531" to open the free browser game with this exact board.