Sudoku
A classic logic puzzle. Fill the 9x9 grid so that each column, each row, and each of the nine 3x3 subgrids contain all of the digits from 1 to 9.
Sudoku Puzzle
Select a cell and use the number buttons to fill the grid.
How to Play Sudoku
Sudoku is a logic-based, number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contain all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.
Basic Strategies for Beginners
- Scanning: Scan rows and columns to eliminate where a specific number can be in a given region. The process is repeated with other numbers.
- Cross-Hatching: This involves scanning rows and columns for a particular number to find its location in a single region.
- Penciling In: When you're not sure which number to place in a cell, you can write small "candidate" numbers in the corners of the cell. As you place more numbers, you can eliminate candidates until only one remains.