Bulldoku Level 666: Walkthrough & Solution
Step-by-step Bulldoku level 666 guide (7×7). One pup per color, row and column, no touching. Difficulty 57.4.
Play Level 666Step-by-step logic
1. Step: mark X in column 7
The orange region is confined to column 7. Mark illegal cells with X.
Board after step 1 2. Step: mark X in column 7
The orange region is confined to column 7. Mark illegal cells with X.
Board after step 2 3. Step: mark X in column 7
The orange region is confined to column 7. Mark illegal cells with X.
Board after step 3 4. Step: mark X in column 7
The orange region is confined to column 7. Mark illegal cells with X.
Board after step 4 5. Step: mark X in row 7
The green region is confined to row 7. Mark X on cells in that row that belong to other regions.
Board after step 5 6. Step: mark X in row 7
The green region is confined to row 7. Mark X on cells in that row that belong to other regions.
Board after step 6 7. Step: mark X in row 7
The green region is confined to row 7. Mark X on cells in that row that belong to other regions.
Board after step 7 8. Step: mark X in row 6
The lavender region is confined to row 6. Mark X on cells in that row that belong to other regions.
Board after step 8 9. Step: mark X in row 6
The lavender region is confined to row 6. Mark X on cells in that row that belong to other regions.
Board after step 9 10. Step: mark X in row 6
The lavender region is confined to row 6. Mark X on cells in that row that belong to other regions.
Board after step 10 11. Step: mark X in row 6
The lavender region is confined to row 6. Mark X on cells in that row that belong to other regions.
Board after step 11 12. Step: mark X in row 6
The lavender region is confined to row 6. Mark X on cells in that row that belong to other regions.
Board after step 12 13. Step: mark X in row 7
The green region is confined to row 7. Mark X on cells in that row that belong to other regions.
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: place pup (row 1, column 4)
After crosses, the cyan region has only one legal cell — row 1, column 4. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 18 19. 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 19 20. 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 20 21. 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 21 22. 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 22 23. 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 23 24. 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 24 25. Step: place pup (row 2, column 2)
After previous pups, row 2 has only one free cell — column 2. Place the pink 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 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 26 27. Step: place pup (row 4, column 3)
After previous pups, row 4 has only one free cell — column 3. Place the yellow region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 27 28. Step: place pup (row 6, column 1)
After previous pups, column 1 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 28 29. Step: place pup (row 5, column 7)
After previous pups, row 5 has only one free cell — column 7. Place the orange region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 29 30. Step: place pup (row 7, column 5)
After previous pups, column 5 has only one free cell — row 7. Place the green region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 30
Final solution
All pups placed correctly: R1 C4, R2 C2, R3 C6, R4 C3, R5 C7, R6 C1, R7 C5
Similar difficulty levels
FAQ
- How do I solve Bulldoku level 666?
- Follow the 30 steps above: find forced placements first, then mark impossible cells with X.
- Where can I play level 666 online?
- Click "Play Level 666" to open the free browser game with this exact board.