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About this game
Sudoku Classic is the complete 9x9 sudoku with nothing trimmed. Every puzzle is generated fresh and verified to have exactly one solution, on three difficulties from a friendly 38 empty cells to a proper 52. Tap a cell and a digit to fill, long-press thinkers can switch on pencil notes and keep up to nine candidates per cell, and any digit that clashes with its row, column or box is flagged red the moment you place it. The number pad shows how many of each digit remain, the timer runs quietly, and mistakes cost score instead of ending the game. There is a daily puzzle with the same seed for the whole planet, and every finished board shares as a spoiler-free challenge link so a friend can play the exact same grid against your time. Works offline, no download.
How to play
Tap a cell, then a digit. Toggle NOTES for pencil marks, ERASE to clear. Complete all rows, columns and boxes to finish. Daily gives one shared puzzle per day.
Tips & Tricks
- Start with rows, columns or boxes that already hold six or more digits.
- Notes are cheap: mark every candidate before you commit to a hard cell.
- When a digit shows zero remaining on the pad, hunt for its last placement.
- The daily puzzle is identical worldwide, so your time compares directly.
Frequently asked questions
Are the puzzles always solvable?
Yes. Every board is generated with a full solution and dug out cell by cell, checking after each removal that exactly one solution remains.
What do the small numbers on the pad mean?
They count how many placements of each digit are still missing. When a digit reaches zero, it is fully placed.
How does scoring work?
Harder boards are worth more, faster finishes add a time bonus, and each mistake subtracts from the final score.
What is the challenge link?
After finishing, SHARE creates a link to the very same puzzle. Whoever opens it plays your exact board and tries to beat your score.
