This is the Sudoku corner of the guides library. Each page below stands alone and answers one question — the rules of a variant, what a term means, how a tough grid actually comes apart, or the practical stuff people ask before they start. There is no required order: pick the question that is yours. You can play Sudoku by WizusLabs free, offline, and without an account. If you would rather read the concise in-game walkthroughs, those live on the game site and are linked in the second group below.
Sudoku by WizusLabs · Guides
Sudoku guides
Every Sudoku guide in one place — the rules, the terms, the variants, a worked hard-solve, and an FAQ.
Sudoku guides
Killer sudoku: rules and strategy
The rules of the killer variant, how cages and their sums work, and the arithmetic tricks that crack the trickier grids.
Sudoku glossary
A plain-language glossary of sudoku terms: cell, region, candidate, naked and hidden singles, pairs and triples, pointing pairs, box-line reduction, X-Wing, swordfish, unique rectangle, cage, and more.
Classic vs killer sudoku
Classic and killer sudoku compared: the shared rules, what cages and sums add, how solving strategy differs, and which variant suits which kind of player.
Sudoku variants explained
A guide to the non-classic sudoku variants — Mini, Irregular (Jigsaw), X-Sudoku, Windoku, Even-Odd, and 12x12 — the extra rule each one adds and a tip for solving it.
Solving a hard sudoku, step by step
A single annotated solve: watch a tough board open up move by move — a hidden single, a naked single, a pointing pair, box-line reduction, and when to reach for an X-Wing.
Sudoku FAQ
Straight answers about Sudoku by WizusLabs: is it free, does it work offline, do you need an account, the daily challenge, hints, the mistake limit, killer mode, and difficulty levels.
On the game site
Concise, in-game walkthroughs live alongside the playable Sudoku on the game site. They cover the same ground more briefly, next to the board itself.
How to play Sudoku
The in-game rules walkthrough: the one rule of classic sudoku and how a round works, right next to the board.
Solving techniques
The in-game techniques reference: singles, pairs, and the logical moves that clear a grid, in brief.
Difficulty levels
The in-game guide to how the difficulty tiers differ and what to expect from each.