Classic Sudoku
Classic Sudoku is the traditional 9x9 number puzzle: fill every empty cell with digits 1 to 9 so no row, column or 3x3 box repeats a number. Free online.
Falls under: Puzzles, Logic Games — this game trains spatial reasoning and puzzle-solving, logical reasoning and deduction.
How to play Classic Sudoku
- Select an empty cell and enter a digit from 1 to 9.
- Each row must contain every digit once.
- Each column must contain every digit once.
- Each 3x3 box must contain every digit once.
About Classic Sudoku
Classic Sudoku brings the familiar 9x9 number puzzle to your browser. The grid starts with some cells already filled, and your job is to complete the rest using the digits 1 to 9. No digit may repeat within a row, within a column and once in each of the nine 3x3 boxes. Every puzzle can be solved by logic alone, so there's never a need to guess. A good way to begin is to find the row, column or box with the most numbers already placed and work out which digits are missing there. Regular play is a calm way to build concentration and step-by-step reasoning.
