About Sudoku on Suvi
A hard puzzle on Suvi needs a hidden pair or an X-wing to crack, and we check that with the same solver that grades every puzzle. Blank count has nothing to do with it. Pencil marks, undo and the optional mistake check are there so you can work it out on your phone without paper.
How to play
- Fill the 9×9 grid so every row, every column and every 3×3 box contains the numbers 1 to 9 once.
- Tap a square, then tap a number. Tap the pencil to jot candidates in a square instead.
- Undo takes back your last move. Erase clears a square. Hint fills one square and tells you why.
- Finish the puzzle to log your time and keep your daily streak going.
Controls
On a phone or tablet: Tap a square, then a number on the pad. Tap Pencil to switch to candidate notes. Pinch isn't needed: the grid fits your screen.
On a desktop: Click a square or use the arrow keys. Type 1–9 to fill, Backspace to clear, P to toggle pencil mode, U to undo.
Tips
- Start with the rows, columns and boxes that already have the most numbers.
- Look for a number that can only go in one place in a box (a hidden single) before trying anything cleverer.
- Pencil marks are for the hard puzzles. On easy and medium you can usually get by without them.
- If two squares in a box can only be the same two numbers, no other square in that box can be either of them.
Read the full guide: “Sudoku techniques: from singles to X-wing” →
Questions
- Is Suvi Sudoku free?
- Yes. Today's puzzles at all four difficulties are free every day, plus a few extra practice puzzles. While Suvi is new, every past puzzle is open to everyone too.
- Are there ads?
- Not while Suvi is new: there are no ads at all, and hints are free. If ads come later, they'll only ever be short ones you choose to watch for a hint. Never banners, pop-ups or anything that interrupts play.
- Is it the same puzzle for everyone?
- Yes. Each day's puzzle is the same for every player, and it changes at midnight in your own time zone.
- Does every puzzle have one solution?
- Always. Every grid is checked for a single solution before you see it, and graded by the solving techniques it needs.
- Can I play on my phone?
- Suvi is built for phones first. The grid fits a portrait screen with big tap targets, and it works just as well on a tablet or desktop.
More Sudoku
Similar games
- Mines — The classic minefield, with a daily board everyone shares and a marked safe start.
- Word Search — A themed grid to swipe through every day. Big letters, no clutter.
- Mini Crossword — A 5×5 crossword you can finish before the kettle boils. New every day.
Who made it
Sudoku is a Suvi Original, written and tested by Brasslight Games. Every puzzle is generated and checked by our own tools; nothing is copied from another site.