Bulldoku Level 637: Walkthrough & Solution
Step-by-step Bulldoku level 637 guide (10×10). One pup per color, row and column, no touching. Difficulty 56.0.
Play Level 637Step-by-step logic
1. Step: place pup (row 1, column 10)
After crosses, the cyan region has only one legal cell — row 1, column 10. 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 2, column 1)
After crosses, the pink region has only one legal cell — row 2, 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 10, column 9)
After crosses, the cyan region has only one legal cell — row 10, column 9. 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 yellow region is confined to column 2. Mark illegal cells with X.
Board after step 4 5. Step: mark X in column 2
The yellow region is confined to column 2. Mark illegal cells with X.
Board after step 5 6. Step: mark X in column 2
The yellow region is confined to column 2. Mark illegal cells with X.
Board after step 6 7. Step: mark X in column 2
The yellow region is confined to column 2. Mark illegal cells with X.
Board after step 7 8. Step: mark X in column 3
The lavender region is confined to column 3. Mark illegal cells with X.
Board after step 8 9. Step: mark X in column 3
The lavender region is confined to column 3. Mark illegal cells with X.
Board after step 9 10. Step: mark X in column 3
The lavender region is confined to column 3. Mark illegal cells with X.
Board after step 10 11. Step: mark X in column 3
The lavender region is confined to column 3. Mark illegal cells with X.
Board after step 11 12. Step: mark X in column 3
The lavender region is confined to column 3. Mark illegal cells 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: 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 14 15. 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 15 16. Step: mark X in row 8
The blue region is confined to row 8. Mark X on cells in that row that belong to other regions.
Board after step 16 17. Step: mark X in row 8
The blue region is confined to row 8. Mark X on cells in that row that belong to other regions.
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: 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 20 21. 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 21 22. Step: place pup (row 3, column 4)
After crosses, the mint region has only one legal cell — row 3, column 4. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 22 23. 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 23 24. Step: place pup (row 9, column 6)
After previous pups, column 6 has only one free cell — row 9. Place the coral region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 24 25. Step: place pup (row 5, column 7)
After previous pups, column 7 has only one free cell — row 5. Place the orange region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 25 26. Step: place pup (row 8, column 8)
After previous pups, row 8 has only one free cell — column 8. Place the blue region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 26
Final solution
All pups placed correctly: R1 C10, R2 C1, R3 C4, R4 C2, R5 C7, R6 C3, R7 C5, R8 C8, R9 C6, R10 C9
Similar difficulty levels
FAQ
- How do I solve Bulldoku level 637?
- Follow the 26 steps above: find forced placements first, then mark impossible cells with X.
- Where can I play level 637 online?
- Click "Play Level 637" to open the free browser game with this exact board.