Puzzle Board
Select Difficulty
Choose a difficulty to generate a puzzle.
Tap an open square to cycle: blank → 0 → 1 → blank.
How to Play
Place a 0 or 1 in every open square.
Binary Puzzle is also known as Takuzu or Binairo.
- Never place three matching numbers in a row: 1 1 _ → 0 and 0 _ 0 → 1.
- Every row and column has the same number of 0s and 1s.
- No two completed rows may match, and no two completed columns may match.
Watch How to Solve a Binary Puzzle
Follow an easy 6 × 6 puzzle step by step and see how each 0 or 1 is logically determined.
How to Solve
- Fill each empty square with a 0 or 1.
- Each row and column must contain equal numbers of 0s and 1s. When one number has filled half a line, the remaining blanks take the other number.
- Never place three matching numbers together horizontally or vertically: 0 0 _ → 1 and 1 _ 1 → 0.
- No two completed rows can be identical. The same applies to columns.
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