Sudoku Classic

Understand the Grid: The board consists of a 9×9 layout divided into nine 3×3 sub-grids. Some numbers are pre-filled as clues.

Objective: Fill all empty cells so each row, each column, and each 3×3 block includes every digit from 1 through 9 exactly once.

Use Logic, Not Guessing: Eliminate possibilities by checking rows, columns, and boxes—strong strategy instead of trial and error yields better results.

Check for Candidates: Many versions allow pencil marks or notes to track possible values for each cell.

Complete and Validate: Once all digits are filled in correctly, the puzzle is solved. Some versions include hints or error alerts optionally.

Multiple Difficulty Levels: Start with easy and progress through medium, hard, expert, and extreme challenges as your skill improves.