How to play Takuzu
Takuzu, also called Binairo or a binary puzzle, uses two symbols. Here they are suns and moons instead of 0 and 1. Tap once for a sun, twice for a moon, and again to clear a cell. The shaded starting clues cannot be changed.
- Balance: each row and column contains three suns and three moons.
- No triples: never place three identical symbols consecutively, horizontally or vertically.
- No duplicate lines: every completed row must differ from every other row, and every completed column must differ from every other column. A row may match a column.
Solving techniques
- Pairs: two adjacent suns need moons on either end; the reverse also applies.
- Gaps: sun, empty cell, sun forces a moon into the gap.
- Counting: once a line has three suns, fill its other cells with moons.
- Avoiding duplicate lines: compare a nearly complete line with a completed one. If only two cells remain and copying them would duplicate the line, balance may force their opposite values.
Takuzu versus Tango
Both games use balanced lines and the no-three rule. Classic Takuzu has no = or × clues and requires distinct rows and distinct columns. Our Tango game uses relationship clues and allows duplicate lines. They have separate practice records.
Free unlimited practice
Choose easy or medium, then press New for another puzzle. This initial library contains 120 original 6×6 puzzles; unsolved puzzles are offered first, and puzzles can be replayed after the library is exhausted. Each puzzle has one verified solution and can be solved with the techniques above, without trial placements.
Your progress and best times stay in this browser. Practice does not change your daily streak or the daily completion rankings. Copy the current URL to share the same starting puzzle.
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