Daily Sudoku
Daily Sudoku is one sudoku a day, the same for everyone on the same date, worked out on your own device with no server. Free, no install, no account.
Daily Sudoku gives you one grid a day. The date itself picks the puzzle, so it is the same one when you come back this afternoon and a different one tomorrow.
about 10.3 KB
Works offline after the first visit. No install, no sign-up.
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How to play Daily Sudoku
The date is the seed, so the puzzle is decided, not random
Today's grid is worked out from today's date rather than drawn at random. That is why it does not change when you reload, and why it is the same puzzle on your phone and your laptop.
Same date, same puzzle — with no server involved
There is no server deciding anything, which means there is nothing to fetch and nothing that can be down. Your device works the grid out itself, and any two devices on the same date arrive at the same one.
Your own calendar decides, not a shared clock
The day changes according to your device's own date rather than a fixed world time zone. Using one zone would move the switch-over for everyone east or west of it, so a late-evening visit could land on the wrong day's puzzle.
Only today's is offered
There is no archive to scroll back through, on purpose. A back-catalogue turns a small daily habit into a backlog, and the point here is a puzzle with your morning rather than a pile to work through.
It is checked in place
A square turns green when it holds the right digit and red when it does not, so you can see where you went wrong as you go rather than at the end.
Daily Sudoku Tips and Strategy
Plan for the grid you have
The date picks the grid, so reloading never produces an easier one and there is no button that does. Fix a scanning order before you start — rows, then columns, then the three-by-three boxes — and keep to it instead of jumping to whatever looks easiest.
Track candidates as you go
Forty-two squares are blank, so most cells begin with several possible digits. Writing the shortlist into each empty square is slower per square and much faster overall, because you stop re-deriving it and can see which cells are down to one option.
A clash means your error
The page fills the grid from one stored solution and does not check that the puzzle has only one answer, so a second valid arrangement is possible in principle and would be marked wrong. If your placements suddenly contradict, re-read the givens rather than assuming the grid is broken.
Daily Sudoku — Frequently Asked Questions
Why is the puzzle the same when I reload?
Because it is worked out from the date rather than drawn at random. Reloading, or closing and reopening the page, gives the same grid all day.
Can I play yesterday's puzzle?
No, and that is deliberate. Keeping a back-catalogue would turn a small daily habit into a growing backlog.
What time does the new one appear?
At midnight, according to your own device's date rather than a shared time zone.
Does it need a connection?
No. The grid is worked out on your device, so it works offline.
Does it need installing or an account?
No. Nothing is stored anywhere but this device, and there is no sign-in.
Daily Sudoku — Past Puzzles and Your Record
Yesterday's grid still exists
The puzzle is worked out from the date rather than kept anywhere, so any past date still determines a grid. Nothing is lost by missing a day; there is simply no list on the page to scroll back through.
Marks are per date, per device
Finishing records one local entry naming this puzzle and the date. It is never uploaded, so clearing site data or moving to another device loses the marks, while the grids themselves stay exactly as they were.
Seven days in one strip
The row of small date cells above the grid shows the last seven days and which of them you finished. It answers whether this week is complete rather than what you did last year.