About Binary Puzzle
Binary Puzzle, also known as Takuzu or Binairo, is a pure logic puzzle with just two symbols. Fill every cell with a sun or a moon so that three simple rules hold: no more than two identical symbols may sit next to each other in a row or column, every row and column holds exactly as many suns as moons, and no two rows or two columns may be identical.
Every puzzle is generated with exactly one solution, so you never need to guess. Look for pairs (the cells on both sides must be the opposite symbol), gaps between two equal symbols, and lines that already have their half. Mistakes glow red right away. Start with 6×6, then take on 8×8 and the big 10×10 grids.
How to play
- Tap a cell to cycle: empty → sun → moon. Right-click goes backwards.
- Never three of the same symbol in a row or column.
- Each line has as many suns as moons, and no two lines are identical.
- Solve it faster with fewer hints for a higher score.
About Binary Puzzle
Binary puzzles, also called Takuzu or Binairo, became popular in puzzle magazines in the 2000s. With just two symbols and three rules, they are a perfect pure-logic workout.
Tips to score higher
- Two equal symbols side by side must be surrounded by the opposite symbol.
- A gap between two equal symbols must be the opposite symbol.
- When a line has its half of one symbol, fill the rest with the other.
- Compare nearly complete lines to avoid identical rows.
Binary Puzzle FAQ
Do I ever need to guess?
No. Every puzzle has exactly one solution reachable by logic.
What do the red cells mean?
They break a rule, such as three in a row or too many of one symbol.
