Sudoku Academy — Free Online Puzzles, 17 Levels & Intelligent Solver

Sudoku AcademyMaster the art of logic with mathematically generated puzzles across 17 difficulty levels.JavaScript is required to play Sudoku Academy. Please enable JavaScript in your browser to access the game.What you'll find at Sudoku Academy

17 difficulty levels — from Naked Single (L1) to Forcing Chain (L17), every grade backed by a real solving technique.

Pure-logic solver with progressive hints and step-by-step walkthroughs — never any guessing.

Hand-curated puzzles — including transcribed New York Times sets, growing every week.

Manual entry mode — type any sudoku from a newspaper or book and the engine grades it, hints it, and walks you through every deduction.

Scribble canvas for pencil-and-paper-style notation, with undo/redo.

Accessibility — left-hand / right-hand UI toggle, customisable themes, victory audio toggle.

Free play covers Levels 1–3 with no sign-up. Premium ($6.99/mo or $59.88/yr) unlocks Levels 4–17 plus the curated library.

Strategies you'll learnNaked Single · Hidden Single · Naked Pair · Hidden Pair · Pointing Pair · Box-Line Reduction · Naked Triple · X-Wing · Swordfish · Empty Rectangle · XY-Wing · Skyscraper · Forcing Chain.

Type & Play

Got a sudoku from a newspaper, book, or magazine? Type it in, tap Play, and we'll grade it, hint it, and walk you through the deductions step-by-step.

Pure-logic solver with progressive hints
Difficulty graded automatically (L1 – L17)
Step-by-step walkthroughs of every technique

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