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Size: 12x12, level: Very hard

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The binary puzzle is a new and challenging logic puzzle that you can solve by reasoning. Only zeros and ones occur in the puzzle, but this turns out to be more complicated than it seems to be. This site offers hundreds of binary puzzles, of various sizes and of various levels. A last warning: The binary puzzle is quite addictive.

Each cell should contain a zero or a one. No more than two similar numbers below or next to each other are allowed. Each row and each column is unique and contains as many zeros as ones.

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