Sudoku guides & examples
Honest, practical writing about sudoku — no fluff, no dark patterns. Two shelves: how-to guides for when you want to learn something, and industry examples for when you're wondering whether sudoku fits your situation.
How-to guides
Variants, techniques and skills — each guide answers one question properly.
Sudoku apps without lives or mistake limits
Why the 3-mistake game-over exists, and how to escape it.
What sudoku difficulty levels actually mean
Easy to Diabolic, explained by the techniques each level requires.
How to play Killer Sudoku
Rules, the 45 rule, and cage strategy from the first move.
Killer Sudoku cage combinations
The full chart, plus a calculator for every cage size and sum.
Every sudoku variant explained
The complete list, from Jigsaw to five-grid Samurai.
How to play Samurai Sudoku
Rules and strategy for the five-grid puzzle.
How to play Jigsaw Sudoku
Irregular, squiggly, nonomino — one variant, many names.
How to play 16×16 Sudoku (Hexadoku)
The super-sized grid, and how to survive it.
Multi-grid sudoku on iPhone & Android
Overlapping-grid puzzles compared, honestly.
Windmill, Sohei, Flower & Gattai sudoku
The rare multi-grid family, explained.
How to get better at sudoku
A practice routine that actually builds skill.
X-Wing and Swordfish explained
Advanced techniques, and the difference between them.
Which sudoku apps actually have no ads?
An honest teardown of "ad-free" claims.
The best sudoku app for iPhone
An honest comparison — including our competitors.
Industry examples
Will sudoku work for your situation? Concrete scenarios, honestly told.