Why rows and columns must all be different

In Binary Puzzle no two rows may match, and no two columns may match. Each line is a unique pattern of 0s and 1s.

This rule matters when a line is almost full. If filling the last cells would copy another finished row, those cells cannot be that pattern. The same is true for columns.

Uniqueness works with the other rules. A line still needs equally many 0s and 1s, and it still cannot hold three identical symbols in a row. When two finishes both look legal, uniqueness picks the one that does not copy a line you already have.

You do not need this on every Beginner board. When you do, compare the almost-full line to the finished ones. Play Binary Puzzle. How to play Binary Puzzle.

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