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
- Each row must have the numbers 1 to 9
No repeats. Every number appears once. - Each column must have the numbers 1 to 9
Again, no duplicates. - 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. - 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
- Look for easy wins: Start with rows, columns, or boxes that already have many numbers filled in.
- Cross-check: If you place a number, check that it doesn't break any of the rules.
- Pencil marks: If you're not sure, note possible numbers in a cell to narrow it down later.