Introduction
Sudoku is a logic puzzle where every number placement must fit the row, column, and 3x3 box. This browser version offers multiple difficulty levels for quick practice or a deeper solve.
How to Play
- Choose an empty cell and enter a number from 1 to 9.
- Make sure each row contains each number only once.
- Make sure each column and 3x3 box also contain each number only once.
- Use notes or careful scanning to solve harder puzzles.
Controls
- Mouse or touch: select a cell, then choose a number.
- Keyboard: type numbers when a cell is selected.
- Difficulty controls: start a new easy, medium, or hard puzzle.
FAQ
Do I need guessing?
Good Sudoku puzzles can be solved with logic, though harder ones require deeper scanning.
What is a 3x3 box?
One of the nine smaller regions inside the full grid.
How do I improve?
Look for rows, columns, or boxes with the fewest missing numbers first.
