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Why Does The Number Turn Red In Sudoku? [Solved]
There are only three empty spaces remaining (now that we’ve placed the 2 and 6, in blue), and we know that the numbers must be 3, 4 and 5. To the left and the right, we can see two number 5s (circled in red) which means that the number 5 must be in the upper left space of the top center square (marked in blue).
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sudokuguy sudokuguy.com PLEASE NOTE. This is NOT a real puzzle. Don’t try to solve it as a puzzle. It is a demonstration only of …
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