New to Sudoku? This page answers the most common questions beginners have. For a complete step-by-step guide to solving techniques, visit our How to Play Sudoku page.
What is the best way to start solving Sudoku as a beginner?
Start with Easy-level puzzles that have many given numbers (36-45 clues). Focus on scanning rows, columns, and 3x3 boxes for cells where only one number can fit. Use pencil marks to track candidates, and never guess — always use logic.
How long does it take to learn Sudoku?
You can learn the basic rules of Sudoku in just 5 minutes. Most beginners can solve an Easy puzzle within 10-20 minutes on their first try. With regular practice, you'll be able to solve Medium puzzles within a week or two.
Should I use pencil marks (notes) in Sudoku?
Yes, especially as a beginner. Pencil marks help you track which numbers are possible in each cell. This makes it much easier to spot patterns and avoid mistakes. Most online Sudoku games, including ours, have a built-in Notes mode.
Is it okay to guess in Sudoku?
No. Every Sudoku puzzle has exactly one solution that can be reached through logic alone. Guessing often leads to contradictions and forces you to start over. Instead, look for cells where only one number is possible, or try a different solving technique.
What are the most common beginner mistakes in Sudoku?
The most common mistakes include: guessing instead of using logic, forgetting to check all three constraints (row, column, and box), not using pencil marks, jumping to hard puzzles too soon, and not updating notes after placing a number.