Sudoku?
Why can only a 2 be left in the white field?
(1 votes)
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Because in the blue-framed column nowhere else the 2 can stand.
A 2 is missing in the column on the right. Each column must have a 2. In the 3×3 area at the bottom right is already a 2. Each 3×3 range may contain only one 2. In the 4th line from below there is already a 2. Each line may contain only one 2. Thus, in the column on the right only fits in the highlighted field the 2.
Under the 5 does not go because in series
is already a 2 and not deeper,
because in the 3×3 at the bottom right is already a 2.