Sudoku
Daily Sudoku is a free daily Sudoku with exactly one solution. Difficulty rises every week across a ten-week season, from Beginner in the first two weeks to Expert in the last two, and then a new season starts.
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Level: , week of 10
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How it works
Fill the grid so every row, column and 3 by 3 box contains the digits 1 to 9 once. Click a square and type a digit, or use the number pad. Duplicates turn red as you go.
Difficulty by week of the season
| Weeks | Level | What it needs |
|---|---|---|
| 1 to 2 | Beginner | Only singles are needed. Many digits are given. |
| 3 to 4 | Easy | Adds locked candidates (pointing and claiming). |
| 5 to 6 | Medium | Adds naked and hidden pairs and triples. |
| 7 to 8 | Hard | Adds X-Wing patterns. |
| 9 to 10 | Expert | Needs a forced guess to get started. Fewest digits given. |
Questions
How hard is each week's Sudoku?
Difficulty rises every week across a ten-week season. Weeks 1 and 2 are Beginner, weeks 3 and 4 Easy, weeks 5 and 6 Medium, weeks 7 and 8 Hard and weeks 9 and 10 Expert. After week 10 a new season starts again at Beginner.
Does every puzzle have exactly one solution?
Yes. Each puzzle is generated by removing digits from a complete grid one pair at a time, and a solver confirms that exactly one solution remains.
How is the difficulty decided?
By the techniques a person needs to solve the puzzle without guessing. Beginner needs only singles. Easy adds locked candidates, Medium adds pairs and triples, Hard needs X-Wing, and Expert needs a forced guess to get started.
What do Check and Auto-check do?
Duplicate digits in a row, column or box turn red automatically. Check tests one square or the whole grid against the solution. Auto-check flags a wrong digit the moment you type it. Using Check, Auto-check or Reveal is shown as solving with help.
What are notes?
Notes let you pencil small candidate digits into a square without committing to them. When you place a digit, matching notes in its row, column and box are cleared.
Is there a time limit?
No. A timer runs while the page is open and visible, and only unaided solves count toward your best time for each difficulty level.
Do I need an account?
No. Signing in is optional and keeps your streak, best times and achievements on every device.
Tips for Sudoku
- Start by scanning each digit: look for the one square in a row, column or box where that digit can go.
- Pencil notes pay off in the later weeks. Mark candidates, then look for pairs that share two candidates in a unit.
- When stuck, pick the row, column or box with the most digits already placed.
- From Hard onward, look for X-Wing patterns: a digit that appears in only two squares in each of two rows, in the same two columns.