Is Sudoku Master really free to play?▾
Yes. Every difficulty level, the notes system, and hints are all free and require no account. You can play directly in your browser on phone, tablet, or desktop.
How many mistakes am I allowed?▾
There is no hard limit. We track mistakes so you can see how many misplacements you made, but the game does not end on wrong moves — learning from mistakes is part of the puzzle.
What does the "Notes" button do?▾
Notes mode lets you write small candidate numbers inside a cell instead of committing to a final digit. It mirrors pencil marks from paper Sudoku and is essential for harder boards.
Are the puzzles generated fresh every time?▾
Yes. Each new game generates a fresh, fully-solvable board using a backtracking algorithm, so you will not see the same puzzle twice.
Can my progress and best times be saved?▾
Your best times and statistics for each difficulty are saved locally in your browser. Nothing is uploaded anywhere, and clearing browser data will reset the stats.
Is Sudoku good for brain health?▾
Research on number puzzles suggests regular play is associated with sharper attention and working memory, especially in older adults. It is not a medical treatment, but a fun mental workout.
