Balance suns and moons in every row and column while obeying equality and difference relationships.
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Suns and moons look like a simple binary choice, but every symbol must satisfy its row and column balance, the no-triples rule and any relationship with its neighbours.
On an 8×8 board, every row and column must finish with four suns and four moons.
Three suns or three moons can never be consecutive. A matching pair often forces the opposite symbol next to it.
The = sign connects two cells that must match. The × sign requires one sun and one moon.
Tap a cell to cycle empty, sun and moon. The strongest deductions appear when a relationship completes or constrains a row or column.
Completa una cuadrícula binaria equilibrada sin triples ni filas o columnas repetidas.
Completa la cuadrícula usando puntos blancos y negros que relacionan pares de números consecutivos o dobles.
Completa la cuadrícula 9×9 sin repetir números en filas, columnas ni bloques.
Crea un único bucle y equilibra las longitudes a ambos lados de cada círculo.
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