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Size: 12x12, level: Very hard

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Each day we have a new special binary puzzle. Today this is a hard 18x18 binary puzzle consisting of nine 6x6 binary puzzles. Click here to solve this puzzle online or to print it.

The binary puzzle is a challenging logic puzzle that can be solved just 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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