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Sudoku blog
Strategy guides, solving techniques, and tips for every level. Start with the complete strategy guide, then work through the techniques. Prefer to just play? Jump in below.
Sudoku Strategy: A Complete Guide From Basics to Expert
A complete Sudoku strategy guide: scanning, singles, pairs, and advanced techniques like X-Wing, in the order you actually need them. No guessing required.
Sudoku Tips and Tricks to Solve Puzzles Faster
Practical Sudoku tips and tricks to solve faster: smarter scanning, cleaner pencil marks, and the habits that separate quick solvers from slow ones.
How to Solve Sudoku: A Step-by-Step Guide for Beginners
Learn how to solve Sudoku step by step. A beginner's walkthrough of the rules, your first moves, and a full worked example, with no math and no guessing.
Naked and Hidden Singles, Pairs & Triples Explained
The core Sudoku techniques explained simply: naked and hidden singles, pairs, and triples. What each one looks like, how to spot it, and exactly when to use it.
X-Wing, Swordfish & Advanced Sudoku Techniques
Advanced Sudoku techniques explained: pointing pairs, box/line reduction, X-Wing, Swordfish, and XY-Wing. The tools for cracking expert and Einstein puzzles.
Does Sudoku Make You Smarter? The Brain Benefits of Sudoku
Does Sudoku make you smarter? An honest look at the brain benefits of Sudoku: what research suggests about memory and focus, and how to get the most from it.
Types of Sudoku: 12 Popular Variations Explained
A tour of 12 Sudoku variations: Killer, Jigsaw, Samurai, KenKen, and more. How each one differs from classic Sudoku, and where to play every type online.
The Hardest Sudoku Puzzles Ever Created
The hardest Sudoku puzzles ever made, from AI Escargot to the so-called world's hardest Sudoku. What makes them brutal, and how to actually approach them.
How to Use Pencil Marks and Candidates in Sudoku
How to use pencil marks (candidates) in Sudoku: when to add them, how to notate cleanly, and how candidates unlock pairs, triples, and advanced moves.