Sudoku techniques from beginner to advanced
Start with the rules, tips, and a repeatable solving order. Then move through candidate notes, singles, intersections, groups, fish, and wings. Every reference explains the proof on a worked grid and links to real practice in Doku.su.
16 free references · beginner through advancedFollow the order. Move on when you can explain why.
Begin with the solving method, then choose the first difficulty level whose proof you cannot yet explain. Apply one move, update candidates, and restart the simple checks before escalating.
Start here: rules, tips, and solving order
Build a reliable routine before learning named patterns, or open the first check you cannot yet prove.
Beginner techniques
Prove certain placements before searching for candidate eliminations.
Intermediate techniques
Use intersections and groups to remove candidates that cannot survive.
Advanced techniques
Follow distant candidate positions and verify every condition before eliminating.
Turn the proof into a move
Interactive lessons use fresh boards and ask you to make the next check yourself. Beginner lessons are free; intermediate and advanced lessons are part of Coaching.
Explore interactive lessons →Use Sudoku away from this page
Printable SudokuPrint today’s puzzle and a separate answer key for home or classroom use.Embed SudokuAdd a playable daily Sudoku to a school, club, blog, or newsletter website.A library published by Doku.su
Every public placement or elimination example is tied to the Doku.su curriculum and checked by its deterministic Sudoku engine. English and French pages use the same proof model.
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