Bulldoku Level 555: Walkthrough & Solution
Step-by-step Bulldoku level 555 guide (9×9). One pup per color, row and column, no touching. Difficulty 51.1.
Play Level 555Step-by-step logic
1. 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 1 2. Step: place pup (row 8, column 5)
After crosses, the blue region has only one legal cell — row 8, column 5. 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 7, column 3)
After crosses, the green region has only one legal cell — row 7, column 3. 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 2
The cyan region is confined to column 2. Mark illegal cells with X.
Board after step 4 5. Step: mark X in column 2
The cyan region is confined to column 2. Mark illegal cells with X.
Board after step 5 6. Step: mark X in column 2
The cyan region is confined to column 2. Mark illegal cells with X.
Board after step 6 7. Step: place pup (row 5, column 4)
After crosses, the orange region has only one legal cell — row 5, column 4. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 7 8. Step: mark X in column 8
The yellow region is confined to column 8. Mark illegal cells with X.
Board after step 8 9. Step: mark X in column 8
The yellow region is confined to column 8. Mark illegal cells with X.
Board after step 9 10. Step: mark X in column 8
The yellow region is confined to column 8. Mark illegal cells 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: 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 13 14. Step: place pup (row 1, column 2)
After previous pups, row 1 has only one free cell — column 2. Place the cyan region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 14 15. 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 15 16. Step: mark X in column 9
The pink region is confined to column 9. Mark illegal cells with X.
Board after step 16 17. 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 17 18. Step: place pup (row 2, column 9)
After previous pups, row 2 has only one free cell — column 9. Place the pink region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 18 19. Step: place pup (row 4, column 8)
After crosses, the yellow region has only one legal cell — row 4, column 8. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 19 20. 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 20 21. Step: place pup (row 6, column 7)
After previous pups, row 6 has only one free cell — column 7. Place the lavender region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 21
Final solution
All pups placed correctly: R1 C2, R2 C9, R3 C6, R4 C8, R5 C4, R6 C7, R7 C3, R8 C5, R9 C1
Similar difficulty levels
FAQ
- How do I solve Bulldoku level 555?
- Follow the 21 steps above: find forced placements first, then mark impossible cells with X.
- Where can I play level 555 online?
- Click "Play Level 555" to open the free browser game with this exact board.