Sudoku Blog
Strategy guides, history, brain science, and tips for every level.
Browse: News · Strategy · Tutorials
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.
Read ArticleSimple 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.
The Difference Between Rows Columns Blocks and Nonets in Sudoku
Rows, columns, blocks, boxes, nonets — Sudoku has several names for the same three types of groups. Here is what each term means and why the distinction matters when you solve.
How to Properly Pronounce and Define Sudoku in English and Japanese
Most English speakers mispronounce Sudoku. Here is how it is said in Japanese, what the name actually means, and why the word tells you everything about how to play.
Understanding the Official Rules and Goal of Sudoku
The rules of Sudoku fit in one sentence — but understanding what they actually demand is what separates guessers from solvers. Here is the complete picture.
Absolute Beginner Guide to Starting Your First Sudoku Puzzle
Never solved a Sudoku before? This step-by-step guide explains the grid, the one golden rule, and exactly how to make your first move — no math required.
Exploring the History and Global Origin of Sudoku
Sudoku wasn't invented in Japan. Discover the true story of how an American architect created it in 1979, how Japan transformed it, and how it conquered the world.
Why Sudoku is a Logic Puzzle and Not a Math Game
Many people avoid Sudoku because they think it requires math. It doesn't. Here's the proof — including a letter-grid test — that Sudoku is pure logic.