Fill every cell with a sun or a moon. Each row and column holds the same number of each, no more than two of the same symbol may sit next to each other, and no two rows or columns are identical. New 6×6, 8×8 and 10×10 puzzles every day, each with one solution.
How to play Sun & Moon
- Fill every empty cell with a sun (☀) or a moon (☾).
- Every row and every column contains the same number of suns and moons.
- No more than two identical symbols may be next to each other in a row or column.
- No two rows are the same, and no two columns are the same.
- Tap a cell to cycle sun → moon → empty. Right-click cycles the other way. Pre-filled cells cannot be changed.
- Choose easy (6×6), medium (8×8) or hard (10×10).
Tips and strategy
- Two identical symbols side by side? The cells on both ends must be the opposite symbol.
- A gap between two identical symbols, like ☀ _ ☀, must be filled with the opposite symbol.
- Count: once a line has half of its cells as suns, the rest of that line are moons.
- When a line is almost full, compare it with completed lines — it must not become a copy of one.
- Red highlights show broken rules straight away, so mistakes are easy to spot.
How to solve the Sun & Moon binary puzzle →
Frequently asked questions
Is there only one solution?
Yes. Every daily grid is checked when it is generated and has exactly one valid solution, so it can always be solved by logic.
What is the difference between the levels?
Easy is a 6×6 grid with extra given cells, medium is 8×8 and hard is 10×10 with as few givens as possible.
Is this the same as Takuzu or Binairo?
Yes, it uses the same rules. Some versions use 0 and 1 or two colours; here the two symbols are a sun and a moon.
Why do some cells turn red?
Red marks three identical symbols in a row, too many of one symbol in a line, or two complete lines that are identical.
Can I use the right mouse button?
Yes. Left click or tap cycles sun → moon → empty, right click cycles moon → sun → empty.
More daily games
Guess the hidden five-letter word in six tries. Colors show which letters are right.
Play nowPlayedDaily SudokuThree new sudoku puzzles every day: easy, medium and hard, each with exactly one solution.
Play nowPlayedDaily EquationFind the hidden eight-character equation in six tries — like a word game, but with numbers.
Play nowPlayedDaily CountryGuess the mystery country. Each guess shows the distance, direction and how close you are.
Play nowPlayedTarget NumberCombine six numbers with + − × ÷ to reach the target. Every daily puzzle can be solved exactly.
Play nowPlayedDaily NonogramFill the grid using the number clues to reveal a hidden pattern. A new 10×10 picross every day.
Play nowPlayedDaily QueensPlace one queen in every row, column and colour region — and no two queens may touch.
Play nowPlayedDaily PathDraw one line through every cell, passing the numbers in order from 1 to the end.
Play nowPlayedDaily MinesweeperClear the field without hitting a mine. Numbers show how many mines touch each square.
Play now