Binary puzzle
Fill every space with a zero or a one. Three rules decide the answer, and between them they leave exactly one way to finish the grid.
Left to fill20
Size
- Status
- Daily
How to play
- No three of the same value next to each other, in a row or in a column.
- Every row and every column ends with as many zeros as ones.
- No two rows are identical, and no two columns are identical.
- Tap a space to cycle it between empty, zero and one. The numbers you were given are fixed.
- Every puzzle has exactly one answer, so nothing ever needs guessing.
Questions
Is this the same as Binairo or Takuzu?
Yes, those are other names for the same puzzle. We call it the binary puzzle because that is what someone searching for it in English tends to type.
Do I ever have to guess?
No. Each puzzle is made by stripping spaces from a finished grid and putting a space back the moment removing it would leave two possible answers, so a chain of deductions always exists.
What does the check button do?
It says how many of the numbers you placed disagree with the answer, without saying which. A nudge, not a solution.