Daily Sudoku

A new puzzle every day

⏱ 0:00🔥 Streak: 0

Solved! 🎉

What is Daily Sudoku?

Daily Sudoku is a free number puzzle that changes every day. At midnight you get three new puzzles: Easy, Medium and Hard. Everybody gets the same puzzles on the same day, so you can compare times with friends. Each puzzle has exactly one solution, and you never need to guess.

Your progress is saved in your browser. Stop any time and carry on later. Solve at least one puzzle a day to keep your 🔥 streak going.

How to use the buttons

Tap a square, then tap a number below the board. On a computer you can also type 1–9 and move with the arrow keys.

Notes (✏️) lets you write small "maybe" numbers in a square. Tap Notes again to write real answers.

Undo takes back your last move. Erase clears a square.

Check shows wrong numbers in red, but never shows the answer.

When you solve it, press Share my time and challenge someone.

What Sudoku does for your mind

Sudoku is a small workout for thinking. Here is what you actually practise while you play:

Focus. You have to look closely at rows, columns and boxes at the same time. Ten quiet minutes with one task is rare in a busy day.

Logical thinking. Every number must be proven: "It can't be here, and it can't be there, so it must be here." This is the same step-by-step thinking you use to solve problems at work or school.

Working memory. You keep a few possibilities in your head while you check the board.

Patience. Hard puzzles teach you to slow down, look again and not give up after the first dead end.

A calm break. Many people use a puzzle to switch off from screens full of news and messages.

A good feeling. Finishing a hard puzzle gives a real sense of "I did it". A daily streak turns that into a small, healthy habit.

What science says, honestly: In 2019, researchers from the University of Exeter and King's College London looked at more than 19,000 adults aged 50 and older. People who did word and number puzzles more often did better on tests of attention, reasoning and memory. But this shows a link, not cause and effect, and people reported their own puzzle habits. The lead researcher said they cannot claim that puzzles reduce the risk of dementia. So enjoy Sudoku as a fun way to keep thinking, not as a medicine.

Who is it for?

Beginners and children: start with Easy. It teaches patience and careful checking.

Daily players: Medium is a good 10–15 minute coffee-break puzzle.

Experts: Hard needs notes and smarter tricks.

Older adults: large numbers, no time pressure and no sign-up. A nice daily routine to share with grandchildren.

Tips to solve faster

Scan one number at a time. Tap a 5 on the board. All the other 5s light up, and the empty spots for 5 become easy to see.

Look for "only one place". If a number can fit in only one square of a box, row or column, write it in.

Look for "only one number". If a square can hold only one number, that is your answer.

Use notes on Hard. Write the 2–3 possible numbers in tricky squares. When you place a number, the app removes it from nearby notes for you.

Never guess. If you feel stuck, scan all nine numbers once more. There is always a logical next step.

Want to go deeper? Read our Sudoku tips for beginners and the X-Wing trick. For a puzzle any time, play classic Sudoku.

A short history of Sudoku

The modern puzzle was most likely created by Howard Garns, a retired architect from Indiana, USA. It was first printed in 1979 in a Dell puzzle magazine as "Number Place". In 1984 a Japanese puzzle company brought it to Japan, and in 1986 the name was shortened to "Sudoku". "Su" means number and "doku" means single. The puzzle became a world hit after newspapers started printing it in 2004.

Fun facts: there are about 6.67 sextillion possible filled Sudoku grids. And a proper Sudoku with only one solution needs at least 17 starting numbers.

Questions people ask

Is Sudoku good for your brain?

Sudoku makes you focus, hold numbers in your head and think step by step. A large UK study of over 19,000 adults aged 50 and older found that people who did number puzzles more often scored better on tests of attention, reasoning and memory. The researchers say this shows a link, not proof that puzzles cause the better scores.

Can Sudoku prevent dementia?

No one has proven that. The lead researcher of the UK study said: "We can't say that playing these puzzles necessarily reduces the risk of dementia in later life." Play Sudoku because it is fun and keeps you thinking, not as a medical treatment.

Do I need to be good at maths?

No. Sudoku uses numbers only as symbols. You never add or multiply. You could play the same game with nine colours or nine letters.

Does everyone get the same puzzle?

Yes. Everyone who opens Daily Sudoku on the same day gets the same Easy, Medium and Hard puzzles. That makes it fun to compare times with friends and family.

When do new puzzles come?

At midnight, by the time on your own phone or computer. If you keep the page open, it reloads by itself after midnight.

Do I need to guess?

Never. Every puzzle has exactly one solution, and you can always find the next number with logic.

Is Daily Sudoku free?

Yes. It is free, with no download and no sign-up. It works in the browser on phones, tablets and computers.