Bulldoku Level 837: Walkthrough & Solution
Step-by-step Bulldoku level 837 guide (10×10). One pup per color, row and column, no touching. Difficulty 69.9.
Play Level 837Step-by-step logic
1. Step: place pup (row 10, column 7)
After crosses, the cyan region has only one legal cell — row 10, 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 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 2 3. Step: place pup (row 2, column 8)
After crosses, the pink region has only one legal cell — row 2, 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 row 1
The cyan region is confined to row 1. Mark X on cells in that row that belong to other regions.
Board after step 4 5. Step: mark X in row 1
The cyan region is confined to row 1. Mark X on cells in that row that belong to other regions.
Board after step 5 6. Step: mark X in row 1
The cyan region is confined to row 1. Mark X on cells in that row that belong to other regions.
Board after step 6 7. Step: mark X in row 1
The cyan region is confined to row 1. Mark X on cells in that row that belong to other regions.
Board after step 7 8. Step: mark X in row 1
The cyan region is confined to row 1. Mark X on cells in that row that belong to other regions.
Board after step 8 9. 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 9 10. 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 10 11. 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 11 12. 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 12 13. Step: mark X in column 2
The yellow region is confined to column 2. Mark illegal cells with X.
Board after step 13 14. Step: place pup (row 1, column 1)
After previous pups, row 1 has only one free cell — column 1. 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: mark X in column 2
The yellow region is confined to column 2. Mark illegal cells with X.
Board after step 15 16. Step: mark X in column 2
The yellow region is confined to column 2. Mark illegal cells with X.
Board after step 16 17. Step: mark X in column 2
The yellow region is confined to column 2. Mark illegal cells with X.
Board after step 17 18. 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 18 19. Step: place pup (row 4, column 2)
After previous pups, column 2 has only one free cell — row 4. Place the yellow region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 19 20. 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 20 21. 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 21 22. Step: place pup (row 6, column 3)
After previous pups, column 3 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 22 23. Step: place pup (row 3, column 4)
After previous pups, column 4 has only one free cell — row 3. Place the mint region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 23 24. Step: mark X in column 5
The blue region is confined to column 5. Mark illegal cells with X.
Board after step 24 25. 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 25 26. Step: place pup (row 8, column 5)
After previous pups, column 5 has only one free cell — row 8. Place the blue region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 26 27. Step: place pup (row 5, column 6)
After crosses, the orange region has only one legal cell — row 5, column 6. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 27 28. Step: place pup (row 7, column 10)
After previous pups, row 7 has only one free cell — column 10. Place the green region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 28
Final solution
All pups placed correctly: R1 C1, R2 C8, R3 C4, R4 C2, R5 C6, R6 C3, R8 C5, R9 C9, R10 C7, R7 C10
Similar difficulty levels
FAQ
- How do I solve Bulldoku level 837?
- Follow the 28 steps above: find forced placements first, then mark impossible cells with X.
- Where can I play level 837 online?
- Click "Play Level 837" to open the free browser game with this exact board.