Bulldoku Level 642: Walkthrough & Solution
Step-by-step Bulldoku level 642 guide (10×10). One pup per color, row and column, no touching. Difficulty 56.1.
Play Level 642Step-by-step logic
1. Step: place pup (row 4, column 7)
After crosses, the yellow region has only one legal cell — row 4, column 7. 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 10, column 1)
After crosses, the cyan region has only one legal cell — row 10, 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 7, column 2)
After crosses, the green region has only one legal cell — row 7, column 2. 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 row 9
The coral region is confined to row 9. Mark X on cells in that row that belong to other regions.
Board after step 4 5. Step: mark X in row 9
The coral region is confined to row 9. Mark X on cells in that row that belong to other regions.
Board after step 5 6. Step: mark X in row 9
The coral region is confined to row 9. Mark X on cells in that row that belong to other regions.
Board after step 6 7. Step: mark X in row 9
The coral region is confined to row 9. Mark X on cells in that row that belong to other regions.
Board after step 7 8. Step: mark X in column 10
The blue region is confined to column 10. Mark illegal cells with X.
Board after step 8 9. Step: mark X in column 10
The blue region is confined to column 10. Mark illegal cells with X.
Board after step 9 10. Step: mark X in column 10
The blue region is confined to column 10. Mark illegal cells with X.
Board after step 10 11. Step: mark X in column 10
The blue region is confined to column 10. Mark illegal cells with X.
Board after step 11 12. Step: mark X in column 10
The blue region is confined to column 10. Mark illegal cells with X.
Board after step 12 13. Step: mark X in row 9
The coral region is confined to row 9. Mark X on cells in that row that belong to other regions.
Board after step 13 14. Step: place pup (row 8, column 10)
After crosses, the blue region has only one legal cell — row 8, column 10. 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 6, column 4)
After crosses, the lavender region has only one legal cell — row 6, column 4. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 15 16. Step: place pup (row 5, column 9)
After previous pups, row 5 has only one free cell — column 9. Place the orange 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 9, column 3)
After previous pups, row 9 has only one free cell — column 3. Place the coral 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 5)
After previous pups, row 3 has only one free cell — column 5. Place the mint 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 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 19 20. Step: place pup (row 2, column 8)
After previous pups, row 2 has only one free cell — column 8. Place the pink region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 20
Final solution
All pups placed correctly: R1 C6, R2 C8, R3 C5, R4 C7, R5 C9, R6 C4, R7 C2, R8 C10, R9 C3, R10 C1
Similar difficulty levels
FAQ
- How do I solve Bulldoku level 642?
- Follow the 20 steps above: find forced placements first, then mark impossible cells with X.
- Where can I play level 642 online?
- Click "Play Level 642" to open the free browser game with this exact board.