Bulldoku Level 668: Walkthrough & Solution
Step-by-step Bulldoku level 668 guide (9×9). One pup per color, row and column, no touching. Difficulty 57.6.
Play Level 668Step-by-step logic
1. 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 1 2. 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 2 3. Step: place pup (row 4, column 2)
After crosses, the yellow region has only one legal cell — row 4, 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 column 3
The green region is confined to column 3. Mark illegal cells with X.
Board after step 4 5. Step: mark X in column 3
The green region is confined to column 3. Mark illegal cells with X.
Board after step 5 6. Step: mark X in column 3
The green region is confined to column 3. Mark illegal cells with X.
Board after step 6 7. 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 7 8. 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 8 9. 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 9 10. 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 10 11. 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 11 12. 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 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 (line reservation)
Several regions share the same rows or columns — other cells on those lines are impossible. Mark them with X.
Board after step 16 17. 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 17 18. 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 18 19. Step: place pup (row 8, column 8)
After crosses, the blue region has only one legal cell — row 8, 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 1, column 9)
After previous pups, column 9 has only one free cell — row 1. Place the cyan 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 3, column 4)
After previous pups, row 3 has only one free cell — column 4. Place the mint region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 21 22. Step: place pup (row 7, column 3)
After previous pups, row 7 has only one free cell — column 3. Place the green region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 22 23. Step: mark X in row 5
The orange region is confined to row 5. Mark X on cells in that row that belong to other regions.
Board after step 23 24. Step: place pup (row 6, column 7)
After previous pups, column 7 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 24 25. Step: place pup (row 5, column 5)
After previous pups, row 5 has only one free cell — column 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 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 26
Final solution
All pups placed correctly: R1 C9, R2 C1, R3 C4, R4 C2, R5 C5, R6 C7, R7 C3, R8 C8, R9 C6
Similar difficulty levels
FAQ
- How do I solve Bulldoku level 668?
- Follow the 26 steps above: find forced placements first, then mark impossible cells with X.
- Where can I play level 668 online?
- Click "Play Level 668" to open the free browser game with this exact board.