SudokuA sparse grid
Expert puzzles start with about 25 filled cells, close to the practical minimum. Every clue counts and the opening moves are rare.
FOR SEASONED SOLVERS
Expert Sudoku Puzzles
Free expert Sudoku with about 25 clues. Every grid is checked to need more than simple singles.
EXPERT LEVEL
Let the logic unfold.
A moment to pause.
Your puzzle will be right here.
Puzzle progress0%
1–9 to fill · Shift+1–9 for notes · Arrows to move · Delete to erase
◇ No account needed✓ Always free to play◎ Made for your focus
EXPERT SUDOKU
Built to resist simple methods
Around 25 clues.
Singles alone will never be enough.
Checked to be hard
Our solver confirms that no Expert puzzle can be finished with naked and hidden singles alone. At some point you will need candidate techniques.
Still fair
Each grid has exactly one solution, so every step can be found by logic. No guessing or trial and error is required.
TECHNIQUES FOR EXPERT
Try it now ↗How to solve an expert Sudoku
Take a complete set of notes
On Expert grids, partial notes hide patterns. Note every candidate in every empty cell before looking for advanced moves.
Box-line reduction
If a digit's only spots in a row or column fall inside one box, that digit cannot go anywhere else in that box. Clear it from the box's other cells.
Naked and hidden triples
Three cells in a unit that share only three candidates lock those digits. Likewise, three digits confined to the same three cells let you erase every other candidate there.
X-Wing
When a digit appears exactly twice in two different rows, in the same two columns, it must take one corner of that rectangle in each row. Remove it from the rest of those two columns.
KEEP PLAYING
More free Sudoku puzzles
Daily SudokuOne shared puzzle a day.Easy Sudoku43 clues, perfect to start.Medium Sudoku36 clues, room to think.Hard Sudoku30 clues, notes recommended.6×6 SudokuDigits 1 to 6, great for kids.Killer SudokuCages, sums, and pure logic.Sudoku SolverSolve any puzzle, step by step.Printable SudokuPrint or save as PDF.Sudoku StrategiesLearn every solving technique.
GOOD TO KNOWA little clarity
A little clarity
before you play.
The details, without the distractions.
What makes a Sudoku expert level?
On Sudoku Prime, Expert puzzles start with about 25 clues and are checked by a solver to make sure they cannot be finished with naked and hidden singles alone.
What techniques do expert Sudoku puzzles need?
Expect pointing pairs, box-line reduction, naked and hidden pairs or triples, and occasionally an X-Wing.
Do expert puzzles require guessing?
No. Every puzzle has exactly one solution and can be solved by logic alone.
Does the game save my progress?
Yes, when browser storage is available. Each difficulty and the Daily Sudoku keep their own saved game in this browser, so switching levels never erases your progress.