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5×5 · 10 steps · difficulty 23.6

Bulldoku Level 21: Walkthrough & Solution

Step-by-step Bulldoku level 21 guide (5×5). One pup per color, row and column, no touching. Difficulty 23.6.

Play Level 21

Step-by-step logic

  1. 1. 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 1

  2. 2. 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 2

  3. 3. 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 3

  4. 4. 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 4

  5. 5. 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 5

  6. 6. Step: place pup (row 3, column 3)

    After previous pups, row 3 has only one free cell — column 3. Place the mint region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).

    Board after step 6

  7. 7. Step: place pup (row 5, column 2)

    After previous pups, column 2 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 7

  8. 8. Step: place pup (row 4, column 5)

    After previous pups, row 4 has only one free cell — column 5. Place the yellow region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).

    Board after step 8

  9. 9. 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 9

  10. 10. Step: place pup (row 2, column 1)

    After previous pups, column 1 has only one free cell — row 2. Place the pink region's pup here. Mark crosses along the row, column, and neighboring cells (see the board).

    Board after step 10

Final solution

All pups placed correctly: R1 C4, R2 C1, R3 C3, R4 C5, R5 C2

Solved board

Similar difficulty levels

FAQ

How do I solve Bulldoku level 21?
Follow the 10 steps above: find forced placements first, then mark impossible cells with X.
Where can I play level 21 online?
Click "Play Level 21" to open the free browser game with this exact board.

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