What are the adjacency clues between cells?

An equals sign (=) between two cells means they must hold the same symbol. A cross (x) means they must hold different symbols. These clues appear on the borders between neighboring cells.

Is there always exactly one solution?

Yes. Every Eclipse puzzle is generated with a unique solution. If you follow the rules correctly, there is only one valid way to fill the grid.

What is marathon mode?

Marathon mode presents a continuous sequence of puzzles. When you solve one, the next appears immediately. It is designed for extended play sessions.

How does the daily challenge work?

A new Eclipse puzzle is generated each day from a shared seed. All players solve the same puzzle, and completion times are posted to the daily leaderboard.

How big are the grids?

Grid size depends on the difficulty level. Easy uses a smaller grid, Medium is mid-sized, and Hard uses a larger grid — all with proportionally more complex constraints.

Play Eclipse Online — Free Sun & Moon Logic Puzzle

How to Play Eclipse

Objective

Fill every empty cell with either a Sun or a Moon so that all row, column, and adjacency constraints are satisfied.

Controls

Tap or click an empty cell to place a Sun. Tap again to switch it to a Moon. Tap once more to clear the cell. Some cells are pre-filled and locked.

Step by Step

1Examine the grid. Some cells are already filled with a Sun or Moon — these are clues.
2Look at the adjacency markers between cells. An equals sign (=) means the two neighbors must be the same symbol. A cross (x) means they must differ.
3Place symbols so that no more than two consecutive cells in a row or column share the same symbol.
4Ensure each row and each column has an equal count of Suns and Moons.
5Check that no two rows are identical and no two columns are identical.

Winning

The puzzle is complete when every cell is filled, all adjacency clues are satisfied, no three-in-a-row violations exist, counts are balanced, and all lines are unique.

Eclipse Rules

Every cell must contain exactly one symbol: Sun or Moon.
No more than two consecutive identical symbols in any row or column.
Each row must have the same number of Suns and Moons.
Each column must have the same number of Suns and Moons.
No two rows may be identical. No two columns may be identical.
Adjacency clues (= or x) between cells must be respected.

Tips & Strategies

1.Start with the adjacency clues — they immediately constrain their neighbors and often cascade into nearby cells.

2.If a row or column already has its maximum count of one symbol, fill the remaining empty cells with the other symbol.

3.Look for forced placements: if placing a symbol in a cell would create three in a row, the cell must contain the opposite symbol.

4.Use the uniqueness rule late in the puzzle — when most of a row or column is filled, compare it against completed lines to resolve remaining cells.

5.On harder puzzles, work through multiple constraints simultaneously rather than relying on a single technique.

About Eclipse

Eclipse is a binary-style logic puzzle built around Suns and Moons. It combines classic Binairo (Takuzu) constraints with adjacency clue markers for added depth. The game offers three difficulty levels — Easy, Medium, and Hard — with grid sizes that scale accordingly. Daily challenges give every player the same puzzle to solve, with results tracked on a shared leaderboard. Marathon mode lets you solve puzzle after puzzle without interruption. Every puzzle is procedurally generated with a guaranteed unique solution.

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