Techniques
Naked pairs, hidden singles, X-wings, cage combinations — the logic patterns that separate easy puzzles from expert ones.
From scanning cells to scanning units
The single biggest perspective shift between beginner and intermediate Sudoku — what it looks like, why it matters, and how to make it automatic.
4 min read
Knowing when to slow down
Speed is the wrong metric on a hard Sudoku — here's how to recognise the moment to slow down, and what slow looks like in practice.
5 min read
Naked and hidden pairs and triples
The mid-level extension of singles — how pairs and triples work, when each shows up, and the perspective shift that surfaces them.
5 min read
Paper versus digital Sudoku
What actually changes between solving on paper and solving on a screen, and the small habits that don't transfer cleanly between the two.
4 min read
The five mistakes every beginner makes
Five specific errors almost every new Sudoku solver makes in their first puzzles — and the small habit changes that fix each one.
4 min read
Why beginners hit walls, and what to do
The 'stuck on every cell' moment in your first puzzles is normal and has a small handful of specific causes — here's how to get past each one.
4 min read
Your first medium puzzle
What actually changes between easy and medium Sudoku, what to expect at minute three, and when to know you're ready for hard.
4 min read
Pencil marks without the clutter
When pencil marks help your Sudoku, when they hurt, and the minimal candidate-marking that gets you unstuck without burying the grid.
5 min read
The two moves that solve most easy puzzles
The naked single and the hidden single — the two foundational Sudoku moves, what each one looks like, and the perspective shift between them.
4 min read
What to do instead of guessing
Why guessing breaks a Sudoku, what 'stuck' actually means, and the practical tactics to try before reaching for a guess.
5 min read
Where to look first on a fresh grid
The discipline of the first sixty seconds — where to scan, what to count, and how to find a strong opening move on any easy or medium Sudoku.
4 min read