3-In-A-Row 3-In-A-Row 3-In-A-Row

3 In-A-Row

Can you complete the grid without creating a 3-In-A-Row? Are you looking to use the 3-In-A-Row puzzle in a publication?

KNS Puzzles offers the following sizes and difficulty levels:

 6 x  6 - Level 1 - Level 2
 8 x  8 - Level 1 - Level 2
10 x 10 - Level 1 - Level 2
12 x 12 - Level 1 - Level 2
14 x 14 - Level 1 - Level 2
18 x 18 - Level 1 BrainBashers Weekly Special

Each 3-In-A-Row puzzle has only one unique solution, which can be found using logic alone, no guesses are required. To play the 3-In-A-Row puzzles, please visit my BrainBashers playable 3-In-A-Row page.

Fill the grid with squares containing Black(X) and White(O). A 3-In-A-Row of the same colour/letter is not allowed. Each row and column has an equal number of Black(X) and White(O) squares. See the Walkthrough or Advanced Tips below for extra tips and helpful hints to help you solve this 3-In-A-Row puzzle.

3-In-A-Row Puzzle Start

Puzzle Start

This is the start of the puzzle.

3-In-A-Row Step 2

Step 2

You are not allowed to have 3 Black squares together, so these highlighted squares have to be be White.

3-In-A-Row Step 3

Step 3

You are not allowed 3 White squares together, so this square has to be Black.

3-In-A-Row Step 4

Step 4

Each row and column must contain the same number of Black and White squares, so these squares must be White.

3-In-A-Row Step 5

Step 5

You are not allowed 3 Black squares together, so these squares must be White.

3-In-A-Row Step 6

Step 6

You are not allowed 3 Black squares together, so these squares must be White.

3-In-A-Row Step 7

Step 7

Each row and column must contain the same number of Black and White squares, so these squares must be Black.

3-In-A-Row Step 8

Step 8

Each row and column must contain the same number of Black and White squares, so this square must be White.

3-In-A-Row Step 9

Step 9

Each row and column must contain the same number of Black and White squares, so this square must be Black.

3-In-A-Row Step 10

Step 10

Each row and column must contain the same number of Black and White squares, so these squares must be Black.

3-In-A-Row Step 11

Step 11

You are not allowed 3 Black squares together, so these squares must be White.

3-In-A-Row Step 12

Step 12

Each row and column must contain the same number of Black and White squares, so this square must be White.

3-In-A-Row Step 13

Step 13

You are not allowed 3 White squares together, so this square must be Black.

3-In-A-Row Step 14

Step 14

You are not allowed 3 Black squares together, so this square must be White.

3-In-A-Row Step 15

Step 15

The puzzle will now complete as each row and column must contain the same number of Black and White squares.

3-In-A-Row Finished Puzzle

Finished Puzzle

The completed puzzle.

3-In-A-Row Advanced Tip 1

Advanced Tip

This square cannot be Black, if it was, it would force the 3 remaining squares in this row to be White, and this would be a 3-In-A-Row of White squares - which isn't allowed. Therefore this square is White.

3-In-A-Row Advanced Tip 2

Advanced Tip

Similarly this square must be Black.