Bulldoku Level 509: Walkthrough & Solution
Step-by-step Bulldoku level 509 guide (9×9). One pup per color, row and column, no touching. Difficulty 49.3.
Play Level 509Step-by-step logic
1. Step: place pup (row 2, column 2)
After crosses, the pink region has only one legal cell — row 2, column 2. 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 5, column 8)
After crosses, the orange region has only one legal cell — row 5, column 8. 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 9)
After crosses, the green region has only one legal cell — row 7, 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 1
The yellow region is confined to column 1. Mark illegal cells with X.
Board after step 4 5. Step: mark X in column 1
The yellow region is confined to column 1. Mark illegal cells with X.
Board after step 5 6. Step: place pup (row 6, column 3)
After crosses, the lavender region has only one legal cell — row 6, column 3. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 6 7. Step: place pup (row 4, column 1)
After previous pups, column 1 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 7 8. Step: place pup (row 8, column 4)
After crosses, the blue region has only one legal cell — row 8, column 4. Place a pup there. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 8 9. 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 9 10. Step: place pup (row 3, column 5)
After previous pups, column 5 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 10 11. Step: place pup (row 1, column 6)
After previous pups, row 1 has only one free cell — column 6. Place the cyan region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).
Board after step 11 12. Step: place pup (row 9, column 7)
After previous pups, column 7 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 12
Final solution
All pups placed correctly: R1 C6, R2 C2, R3 C5, R4 C1, R5 C8, R6 C3, R7 C9, R8 C4, R9 C7
Similar difficulty levels
FAQ
- How do I solve Bulldoku level 509?
- Follow the 12 steps above: find forced placements first, then mark impossible cells with X.
- Where can I play level 509 online?
- Click "Play Level 509" to open the free browser game with this exact board.