Sudoku Blog
Strategy guides, history, brain science, and tips for every level.
Browse: News · Strategy · Tutorials
Advanced Logic for Tackling Diabolical and Nightmare Puzzles
Diabolical and Nightmare Sudoku puzzles require techniques beyond pairs and locked candidates. Here is the toolbox you need and how to apply it systematically.
Read ArticleHow to Identify and Use Skyscraper and XY Wing Patterns
Skyscraper and XY-Wing are two of the most powerful intermediate techniques in Sudoku. Here is how to spot them and what eliminations they allow.
The Strategy for Solving Medium Difficulty Sudoku Puzzles
Medium Sudoku requires more than scanning — but not as much as most players think. Here is the complete strategy to crack Medium puzzles every time.
Effective Ways to Eliminate Candidates and Narrow Your Choices
Candidate elimination is the core skill in Sudoku. Every technique — from basic scanning to advanced chains — is just a more powerful way to eliminate impossible digits from cells.
How to Fill the First Three Rows of Sudoku Using Logic
The top three rows of a Sudoku grid form the top band — and solving them correctly creates a cascade that makes the rest of the puzzle flow faster. Here is the logical approach.
How to Start a Sudoku Puzzle the Right Way Every Time
The first moves you make in a Sudoku puzzle set the pace for everything that follows. Here is the right starting sequence to find early wins and avoid wasted effort.
Transitioning from Medium to Hard Sudoku Difficulty Levels
Medium Sudoku and Hard Sudoku look similar on the grid but require completely different techniques. Here is what changes at each level and how to bridge the gap.
Simple Steps to Solve Easy Sudoku Puzzles for New Players
Easy Sudoku puzzles are designed so there is always at least one obvious move. Here are the exact steps new players should follow to solve their first puzzle without guessing.
How the 9x9 Sudoku Grid is Built and Structured
The 9×9 Sudoku grid looks simple at first glance, but its structure is carefully engineered. Understanding exactly how it is built explains why the puzzle works the way it does.
Essential Sudoku Terminology for Every Serious Player
Naked Singles, Hidden Pairs, locked candidates, conjugate pairs — Sudoku has its own vocabulary. Here is a clear reference for the terms every serious solver should know.
Simple Rules for Playing Sudoku with Numbers and Letters
You can play Sudoku with digits, letters, colors, or symbols — the logic stays exactly the same. Here are the rules in their simplest form and why the choice of symbols does not matter.
The Real Meaning of Sudoku and Where the Name Comes From
The name Sudoku has a meaning that most players never know. It comes from a Japanese phrase that is also a perfect summary of the game's only rule.