How to Play
Sudoku Classic preserves the original puzzle format. You receive a 9x9 grid with some digits already filled in. Complete the grid so each row, column, and 3x3 box contains the digits 1 through 9 with no repeats.
The beauty of classic Sudoku is its self-contained logic. No arithmetic, no hidden mechanics—just deduction from the clues provided.
Controls
Click a cell and choose a number. Most interfaces support pencil marks, erasing, and hint buttons.
Scoring
Classic mode usually scores by completion time and mistake count. Some leaderboards separate difficulty levels.
