Practice
Sudoku Basics · Lesson 1 of 3
The rule of the grid
What Sudoku is: every row, column, and 3×3 box holds 1–9 exactly once.
Step 1 / 6
Welcome! A Sudoku is a 9×9 grid. The goal is to fill it with the digits 1 to 9 — following three simple rules.
Digits