Three rules, endless puzzles
The binary puzzle – also called takuzu or binairo – is a logic puzzle with only two symbols: 0 and 1 (here orange and blue). Fill every empty cell so that: no more than two equal cells are next to each other, every row and column has as many 0s as 1s, and no two rows or columns are identical.
Each puzzle is generated on your device and checked to have exactly one solution that can be found by logic – no guessing needed. Start with 6×6 on easy, then try 8×8 and 10×10 on hard. Rule breaks are highlighted as you play, a hint fills a cell (for 15 seconds), and your best times are saved.
How to use
- Choose a size and difficulty.
- Tap a cell to switch between empty, 0 and 1.
- Follow the three rules – red outlines show rule breaks.
- Fill the whole grid correctly to win.
Ideas for using it
- Coffee break. a 6×6 easy grid takes two or three minutes.
- Brain training. 10×10 hard for a real challenge.
- Sudoku fans. a fresh logic puzzle with simple rules.
- Class. great for logical thinking in maths lessons.