What Is Sudoku?

Sudoku is a logic puzzle. The goal is to fill a 9x9 grid so that every row, column, and 3x3 box contains all numbers from 1 to 9. All without repeating any number in each row, column, or box.

The 4 Golden Rules

  1. Each row must have the numbers 1 to 9
    No repeats. Every number appears once.
  2. Each column must have the numbers 1 to 9
    Again, no duplicates.
  3. Each 3x3 box must have the numbers 1 to 9
    There are nine 3x3 boxes in the full grid. No repeating numbers in each one.
  4. Use logic, not guessing
    You should be able to solve a good Sudoku with deduction only. No need to guess randomly.

Helpful Tips To Get Started