Sun & Moon
Fill the grid with suns and moons. Never three in a row, the same number of each in every line, and no two lines alike. Later grids add = and × marks.
Play nowHow to play
Controls
Tap- Tap a cell: sun, moon, empty.
- No three alike in a row.
- Each row and column gets the same number of suns and moons.
About the game
Sun & Moon is a tidy logic puzzle, sometimes called binary or takuzu. Every cell holds a sun or a moon. Three rules decide everything: no more than two of the same next to each other in a line, every row and column holds as many suns as moons, and no two rows or columns may be exactly the same. Each grid has one answer, and you can always reach it by pure reasoning, no guessing needed.
The puzzles start on small six by six grids and grow to ten by ten. Later levels add little marks between cells: an equals sign means the two neighbours match, a cross means they differ. Mistakes light up red the moment a rule breaks, undo is unlimited, and a hint fills in one cell that logic can already prove. Forty levels.
Free to play in your browser. No download, no sign-up. Works on phones, tablets and computers. Your progress is saved on this device.