Eclipse
Balance suns and moons in harmony
Eclipse is a binary puzzle where you fill a grid with suns (☀️) and moons (🌙). Every row and column needs equal numbers of each, and no three consecutive cells can be the same.
Rules
Place either a sun or moon in each empty cell. The grid must be completely filled.
Each row must have the same number of suns as moons. Same for each column. In a 6×6 grid, that's 3 of each per row/column.
You cannot have three consecutive suns or three consecutive moons in any row or column. Break up sequences!
Some cells start filled. Use these as anchors to deduce the rest.
An = between cells means they must be the same (both sun or both moon). An × between cells means they must be different (one sun, one moon).
Strategies & Tips
Apply the Three Rule
If you see two suns in a row, the cells on either end must be moons (to prevent three suns). This is your most powerful technique.
Count as You Go
Track how many suns and moons are in each row/column. When you hit the maximum (half the grid size), fill the rest with the opposite.
Look for Forced Cells
Sometimes a cell has only one valid option based on its neighbors and the counts. Scan for these easy wins.
Use Symmetry
The equal-count rule means if a row has 2 suns placed, it needs exactly (half - 2) more suns. Count what's missing.