Learn Sudoku
A collection of guides designed to explain Sudoku rules, techniques, and reasoning.
Sudoku Fundamentals
6 articles
What Is Sudoku and Why Is It So Popular
Discover what Sudoku is, why it is not a math game, and why millions of people still enjoy it. A simple guide to get started.
Sudoku Rules: a simple guide for beginners
Learn the rules of Sudoku in a simple way: rows, columns, blocks, and the numbers to place. A perfect guide for anyone starting from zero.
How to solve a Sudoku: basic step-by-step method
Learn how to solve a Sudoku starting from the basics: observing the grid, missing numbers, forced cells, and logical method.
Candidates in Sudoku: what they are and how to use them
Learn what candidates are in Sudoku, how to use them to reason better, and when to update notes during solving.
Sudoku difficulty levels: easy, medium, hard
Learn what makes a Sudoku easy, medium, or hard: it is not only the number of empty cells, but also the techniques required.
Most Common Sudoku Mistakes and How to Avoid Them
Discover the most common Sudoku mistakes: entering numbers too quickly, not updating candidates, random guessing, and poor checking.
Basic resolution techniques
4 articles
Sudoku Techniques for Beginners: Complete Overview
Discover the main Sudoku techniques for beginners: how to reason about the grid, find forced cells, and solve without guessing.
Naked Single in Sudoku: The Simplest Technique
Discover what a Naked Single is in Sudoku, how to recognize it, and why it is one of the simplest and most important techniques to start with.
Hidden Single in Sudoku: Finding the Hidden Number
Discover what a Hidden Single is in Sudoku, how to recognize it in rows, columns, and blocks, and why it is a fundamental technique.
Naked Single and Hidden Single: Differences and Examples
Discover the difference between Naked Single and Hidden Single in Sudoku, with simple explanations, practical examples, and a method to recognize them.
Intermediate techniques
8 articles
Naked Pair in Sudoku: how to eliminate candidates
Learn what a Naked Pair is in Sudoku, how to recognize it in rows, columns and boxes, and how to use it to eliminate candidates.
Hidden Pair in Sudoku: the hidden pair
Learn what a Hidden Pair is in Sudoku, how to identify a hidden pair and how to reduce the candidates in the involved cells.
Naked Pair and Hidden Pair: differences, examples and method
A simple comparison between Naked Pair and Hidden Pair in Sudoku: differences, practical examples, possible eliminations and a method to recognize them.
Pointing in Sudoku: using boxes to eliminate candidates
Learn the Pointing technique in Sudoku: how to use aligned candidates inside a box to eliminate possibilities from rows and columns.
Claiming in Sudoku: using rows and columns to narrow a box
Learn the Claiming technique in Sudoku: how to use a row or column to eliminate candidates inside a box.
Pointing and Claiming: the differences explained clearly
Learn the difference between Pointing and Claiming in Sudoku, with simple examples, a practical method and correct eliminations.
Naked Triple in Sudoku: when three cells work together
Learn what a Naked Triple is in Sudoku, how to recognize it in rows, columns and boxes, and how to use it to eliminate candidates.
How to move from easy Sudoku to medium Sudoku
Learn how to move from easy Sudoku to medium Sudoku: candidates, intermediate techniques, training method and practical tips.
Advanced techniques
4 articles
X-Wing in Sudoku: advanced technique explained simply
Learn the X-Wing technique in Sudoku: how to recognize the rectangular pattern, when to use it and which candidates to eliminate.
Y-Wing in Sudoku: how the three-cell chain works
Learn the Y-Wing technique in Sudoku: pivot, wing cells, linked candidates and possible eliminations explained simply.
X-Wing and Y-Wing: two advanced techniques compared
Learn the differences between X-Wing and Y-Wing in Sudoku: how to recognize them, when to use them, and which technique to learn first.
How to solve hard Sudoku without guessing
Learn how to approach hard Sudoku puzzles with method: updated candidates, technique order, X-Wing, Y-Wing, and error checking.
Method, training and improvement
5 articles
Sudoku solving method: recommended order of techniques
Discover an organized method for solving Sudoku: which techniques to look for first, how to use candidates, and how to avoid random guessing.
How to improve at Sudoku: a practical training guide
Learn how to improve at Sudoku with practical training: the right difficulty, techniques, error management, hints, and progress tracking.
How to use Sudoku hints without ruining the game
Learn how to use Sudoku hints the right way: not as a shortcut, but as an explanation to learn techniques and improve.
How long does it take to solve a Sudoku?
Find out how long it can take to solve a Sudoku and which factors affect solving time: difficulty, experience, mistakes, and technique.
Sudoku and concentration: mental benefits and useful habits
Discover why Sudoku can help train concentration, logic, and patience, and how to include it in a balanced daily routine.
Sudoku Types and Site Formats
4 articles
Sudoku 4×4, 6×6, 9×9 and 12×12: differences
Learn the differences between 4×4, 6×6, 9×9 and 12×12 Sudoku: sizes, difficulty, duration and the format best suited to your level.
Sudoku 9×9: the complete guide to the classic format
Learn everything about 9×9 Sudoku: grid structure, rules, 3×3 blocks, numbers from 1 to 9, difficulty and the most used techniques.
Daily Sudoku: what it is and why to play it every day
Learn what daily Sudoku is, why it can become a good habit and how to approach the daily challenge with method.
Sudoku with special symbols: numbers, letters and emoji
Learn how Sudoku with special symbols, letters or emoji works: the rules stay the same, but the way you read the grid changes.
Glossary and FAQ
2 articles
Sudoku glossary: terms and techniques explained simply
Browse the Sudoku glossary with simple explanations of cells, rows, columns, blocks, candidates, solving techniques and difficulty.
Sudoku FAQ: frequently asked questions for beginners
Find simple answers to the most frequently asked questions about Sudoku: rules, difficulty, candidates, hints, techniques and improvement.