Moon Sudoku
Fill the grid so every row, column and box holds the digits 1 to 9. A daily puzzle, or unlimited puzzles at Easy, Medium and Hard.
How to play
Fill every empty square with a digit from 1 to 9 so that each row, each column and each of the nine 3×3 boxes contains every digit exactly once. Every puzzle has exactly one solution and can be solved by logic alone.
- Tap a square, then tap a number (or type it). Digits that are part of the puzzle are fixed.
- Notes lets you jot small candidate digits in a square. When you place a digit, it is cleared from the notes of the squares that can see it.
- Check marks wrong digits. Hint fills in one square for you. Both are counted in your result. Show mistakes flags wrong digits as you go.
- Keyboard: arrow keys move, 1 to 9 enter a digit, 0 or Backspace erases, N toggles notes, U undoes.
Daily puzzle: everyone gets the same puzzle each day (easier early in the week, harder on weekends). Unlimited: pick Easy, Medium or Hard. Your progress and stats are saved in this browser.