Sudoku rules are simple: fill the grid so every row, column, and 3x3 box includes the digits 1–9 exactly once. No guessing is required when you apply logical deductions. This page gives you the core rules and a place to practice right away.
Start a puzzle instantly and apply the rules step by step. Use notes to track possibilities and hints when you need extra clarity. Once the basics feel natural, step up to Medium or Hard Sudoku for deeper logic challenges.