Objectives / Rules
- Fill the grid with Blue(X) or White(O) squares.
- Every row and column has an equal number of Blue(X) and White(O) squares.
- A 3-In-A-Row of the same colour / letter isn't allowed.
See the Walkthrough or Advanced Techniques below for extra tips and tricks.
Objective
When the puzzle is complete each row and column has an equal number of Blue(X) and White(O) squares.
There will be no sequence of 3-In-A-Row squares of the same colour.
Click or move your mouse over the puzzle to see its answer.
Walkthrough
Step 2
You are not allowed 3 Blue(X) squares together, so these squares must be White(O).
You are not allowed 3 Blue(X) squares together, so these squares must be White(O).
Step 3
You are not allowed 3 White(O) squares together, so this square must be Blue(X).
You are not allowed 3 White(O) squares together, so this square must be Blue(X).
Step 4
Each row and column must contain the same number of Blue(X) and White(O) squares, so these squares must be White(O).
Each row and column must contain the same number of Blue(X) and White(O) squares, so these squares must be White(O).
Step 5
You are not allowed 3 White(O) squares together, so these squares must be Blue(X).
You are not allowed 3 White(O) squares together, so these squares must be Blue(X).
Step 6
You are not allowed 3 Blue(X) squares together, so these squares must be White(O).
You are not allowed 3 Blue(X) squares together, so these squares must be White(O).
Step 7
Each row and column must contain the same number of Blue(X) and White(O) squares, so these squares must be Blue(X).
Each row and column must contain the same number of Blue(X) and White(O) squares, so these squares must be Blue(X).
Step 8
Each row and column must contain the same number of Blue(X) and White(O) squares, so this square must be White(O).
Each row and column must contain the same number of Blue(X) and White(O) squares, so this square must be White(O).
Step 9
Each row and column must contain the same number of Blue(X) and White(O) squares, so this square must be Blue(X).
Each row and column must contain the same number of Blue(X) and White(O) squares, so this square must be Blue(X).
Step 10
Each row and column must contain the same number of Blue(X) and White(O) squares, so these squares must be Blue(X).
Each row and column must contain the same number of Blue(X) and White(O) squares, so these squares must be Blue(X).
Step 11
You are not allowed 3 Blue(X) squares together, so these squares must be White(O).
You are not allowed 3 Blue(X) squares together, so these squares must be White(O).
Step 12
Each row and column must contain the same number of Blue(X) and White(O) squares, so this square must be White(O).
Each row and column must contain the same number of Blue(X) and White(O) squares, so this square must be White(O).
Step 13
You are not allowed 3 White(O) squares together, so this square must be Blue(X).
You are not allowed 3 White(O) squares together, so this square must be Blue(X).
Step 14
You are not allowed 3 Blue(X) squares together, so this square must be White(O).
You are not allowed 3 Blue(X) squares together, so this square must be White(O).
Step 15
The puzzle will now complete as each row and column must contain the same number of Blue(X) and White(O) squares
The puzzle will now complete as each row and column must contain the same number of Blue(X) and White(O) squares
Step 16
The completed puzzle.
The completed puzzle.
Advanced Techniques
This square cannot be Blue(X), if it was, it would force the 3 remaining squares in this row to be White(O), and this would be a 3-In-A-Row of White(O) squares – which isn't allowed.
Therefore this square is White(O).
Therefore this square is White(O).
Similarly this square must be Blue(X).
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