Click a cell to select · press 0 or 1 · arrow keys to navigate
Takuzu (also known as Binairo, Binary Puzzle, or 0hh1) is a logic puzzle played on a square grid with an even number of rows and columns. Each cell must be filled with either a 0 or a 1, obeying three constraints: no three consecutive identical digits in any direction, equal counts of 0s and 1s in every row and column, and no two identical rows or columns in the entire grid.
Unlike Sudoku which uses nine digits, Takuzu uses only two — making each individual rule feel obvious while the puzzle as a whole stays challenging. The three rules interact in surprising ways. A single forced cell cascades across the grid, triggering more deductions until the solution emerges from pure logic alone.
Takuzu was popularized in France in the early 2000s, where it appeared in puzzle magazines under several names. The Dutch publisher Conceptis made it famous internationally under the name Binairo. Regardless of name, the puzzle scales elegantly with grid size — a 6×6 grid is solvable in minutes, while a 10×10 grid challenges even experienced solvers.
This implementation generates fresh puzzles instantly in your browser, stores nothing, and sends nothing to any server. Every puzzle is built from a unique valid solution, so the answer is always reachable through logical deduction — no guessing required.
Click any empty cell to fill it with a 0. Click again to change it to a 1. Click a third time to clear it back to empty. The shaded cells are pre-filled clues — they cannot be changed.
Use Check to highlight any incorrect cells in red. Use Hint to reveal one correct cell at a time. Use Solve to reveal the complete solution. Use Clear to erase all your filled cells and start fresh without generating a new puzzle.
Start with the three-in-a-row rule — it's the most powerful. If two identical digits sit adjacent, the cells on both sides must be the opposite. Then count: if a row already has four 1s in an 8×8 grid, fill all remaining cells with 0. Finally, compare nearly-complete rows against each other to prevent duplicates.
Takuzu (also called Binairo or binary puzzle) is a logic puzzle played on a square grid. Fill each cell with 0 or 1, following three rules: no three consecutive identical digits, balanced rows and columns, no duplicate rows or columns.
Click any empty cell to cycle: empty → 0 → 1 → empty. Shaded cells are clues and cannot be changed. Use Check to validate, Hint to reveal one cell, Solve to reveal the full answer.
In a 6×6 grid, every row and column must contain exactly three 0s and three 1s. In an 8×8, exactly four of each. Grids always have an even size so the balance is always achievable.
The same puzzle. Binairo is the trademarked name from Belgian publisher Puzzler Media. Takuzu is the common name elsewhere. Also called Binary Puzzle, 0hh1, and Tic-Tac-Logic.
No. Every puzzle here is solvable by logical deduction alone. The three rules — three-in-a-row, balance, and no-duplicate — provide enough constraints to always find the next forced move without guessing.
Three techniques cover most situations: (1) Adjacent pair forces the neighbors — if 1,1 appear side by side, both ends must be 0. (2) Completed count fills the rest — if a row has four 1s in a 8×8 grid, fill remaining cells with 0. (3) Almost-duplicate rows — if two rows are identical except for one empty cell, that cell must differ from the completed row at that position.
No time limit. The timer tracks your elapsed time, but there's no penalty for taking as long as you need. Logic puzzles reward patience.
Yes. No account, no ads, no signup. The game runs entirely in your browser — nothing is sent to any server. You can even play offline once the page is loaded.