About Sun and Moon
Sun and Moon is a balancing logic puzzle, known around the world as Binairo or Takuzu. Every square gets a sun or a moon. Each row and each column must have the same number of suns and moons, there may never be three of the same next to each other, and no two rows or two columns may be exactly alike.
There are 60 puzzles in five packs, from tiny 4 by 4 warm-ups to big 10 by 10 night puzzles. Grey squares are given, and squares that break a rule turn red right away, so it is easy to spot a mistake. Every puzzle has exactly one answer, checked by a robot.
The puzzle teaches step-by-step reasoning with simple patterns: two suns side by side must have moons on both ends, and a sun, a gap and a sun means the gap is a moon. New looks swap the suns and moons for fruit, pets or sea creatures. Solving without hints wins 3 stars.
Best for ages 7+
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