How to Play Binairo
- Tap the board to open the game without entering a digit.
- Grey tiles are fixed clues; yellow tiles are editable.
- Tap an editable cell to cycle its value: Empty → 0 → 1 → Empty.
- No Triples: You cannot place more than two identical digits next to each other horizontally or vertically (e.g., 0-0-0 is forbidden).
- Balanced Lines: Each row and column must contain an equal number of 0s and 1s (e.g., three 0s and three 1s in a 6×6 grid).
- Unique Lines: No two rows can be identical, and no two columns can be identical.
- Hint explains a move first. Apply uses one hint; Cancel leaves the puzzle unchanged.
- Marked cells show a conflict. Tap Hint to see which rule is broken, or keep editing; mistakes do not end your game.
- Fill the entire grid correctly without breaking any of the three rules to win.
About Binairo (Takuzu)
Binairo is also called Takuzu or a binary puzzle. You fill a grid with 0s and 1s by checking three rules. A move can force another in its row or column; use the worked example below to practise this step by step.
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Play Binairo free online directly in your browser. There are no downloads, no installations, no accounts, and no interruptions from advertisements. Enjoy a clean paper-style notebook layout designed for fast, focused puzzle solving on any device.
Four difficulty levels let you tailor the challenge: Easy (6×6), Medium (8×8), Hard (10×10), and Expert (12×12). The labels describe the grid size and number of starting digits, rather than a verified level of deduction difficulty. On a small screen, choose a smaller board if the game asks for more space.
Generated Boards and Rule-Based Hints
Easy boards have one solution and can be completed using the direct rules explained below. Medium, Hard and Expert boards may have several valid solutions. Any completed grid that preserves the starting digits and follows all three rules counts as a win. Hint explains a forced move before you choose Apply or Cancel; only Apply fills the cell and uses a hint.
Binairo Strategy and Tips
1. Avoid Triples: Pairs and Sandwiches
Two adjacent 0s force the next cell to be 1. Two 1s separated by one empty cell force a 0 in the middle. The blue outlines below show the deductions.
These rules apply horizontally and vertically. An empty cell on either side of a pair must be the opposite digit if it lies within the grid.
2. Balance Each Row and Column
A six-cell line needs three 0s and three 1s. This row already has three 0s, so both empty cells must be 1.
On 8×8, 10×10 and 12×12 boards, the count is four, five and six of each digit. Check columns as well as rows.
3. Keep Completed Lines Different
The first row below is complete. In the second row, placing 0 then 1 in the empty cells would copy it. Place 1 then 0 instead.
No two completed rows may match, and no two completed columns may match. A row may match a column. These are local examples: on a real board, check the crossing lines too.
Find Your First Move
Scan for a pair or a sandwich first. Then count each line. A deduction may unlock another row or column. If you get stuck, Hint can explain a supported forced move before you choose whether to apply it.
FAQ
Is this Binairo game free?
Yes. No ads, no account, no download. Open the page and play immediately in your web browser.
Can I play Binairo on my phone or tablet?
Yes. Tap the board to open the game, then tap an editable cell to cycle between empty, 0, and 1. The game fits the screen without scrolling; if a large board cannot fit, choose a smaller size.
What is the difference between Binairo and Takuzu?
Binairo and Takuzu are names for the same binary puzzle, with the same three rules.
Does every board have one solution?
Easy boards have one solution and can be completed using the direct rules in this guide. Medium, Hard and Expert boards may have several solutions. Any completed grid that keeps the starting digits and follows all three rules counts as a win.
What happens when I make a mistake?
Your game continues. A soft outline marks one conflicting group at a time. Keep tapping to change or clear a digit, or tap Hint to explain the marked conflict. Seeing a conflict explanation does not use a hint.
How do explained hints work?
Hint previews a forced move and explains the rule. Apply fills the cell and uses one of your three hints; Cancel keeps the board unchanged. If no direct forced move is found, no hint is used. The helper checks pairs, balance and completed-line uniqueness; it does not cover every deduction.