Sudojo: Sudoku Techniques

Sudojo is the ultimate Sudoku learning platform that teaches you how to solve puzzles — not just gives you answers. Progress from beginner to expert through a structured belt system while mastering 60+ real solving techniques used by championship players. DAILY CHALLENGES • A fresh puzzle every day tailored to your skill level • Track your daily streak and compete with yourself • Share your completed puzzles with friends LEARN 60 SOLVING TECHNIQUES • Each technique includes step-by-step explanations and practice puzzles Basics: Full House, Hidden Single, Naked Single Pairs & Tuples: Hidden Pair, Naked Pair, Locked Candidates, Hidden Triple, Naked Triple, Hidden Quad, Naked Quad Fish: X-Wing, Swordfish, Jellyfish, Squirmbag Finned Fish: Finned X-Wing, Finned Swordfish, Finned Jellyfish, Finned Squirmbag Sashimi Fish: Sashimi X-Wing, Sashimi Swordfish, Sashimi Jellyfish Franken Fish: Franken X-Wing, Franken Swordfish, Franken Jellyfish Wings: XY-Wing, XYZ-Wing, WXYZ-Wing, VWXYZ-Wing, UVWXYZ-Wing, TUVWXYZ-Wing, STUVWXYZ-Wing Single-Digit Patterns: Skyscraper, Two-String Kite, Empty Rectangle, Simple Coloring, W-Wing, Remote Pairs, Crane, Firework Unique Rectangles: Type 1, Type 2, Type 3, Type 4, Type 5, Hidden UR, Avoidable Rectangle Almost Locked Sets: ALS, ALS-XZ, ALS Chain, Sue de Coq, Death Blossom Chains: X-Cycles, Grouped X-Cycles, X-Chain, XY-Chain, AIC, Medusa Coloring, BUG+1, Forcing Chains, Forcing Net SMART HINT SYSTEM • Hints that teach you the technique, not just the answer • Visual highlighting shows exactly which cells and candidates matter • Step-by-step walkthrough of the solving logic • Learn the "why" behind every move BELT PROGRESSION SYSTEM • 12 belt levels from White Belt (beginner) to Black Belt (master) • Each belt introduces new techniques and harder puzzles • Earn points, unlock badges, and track your improvement 12 DIFFICULTY LEVELS • Beginner to Extreme — there's always a new challenge • Each level focuses on specific techniques • Free access to foundational levels • Premium unlocks advanced and expert difficulties MORE FEATURES • Enter custom puzzles manually • Multiple display modes: Numbers, Kanji (漢数字), or Emoji • Pencil marks with auto-candidate mode • Timer and error highlighting (optional) • Dark mode and 16 language options • Sync progress across devices with your account FREE & PREMIUM • Play daily puzzles and beginner-to-challenging levels for free • Subscribe to unlock advanced levels, expert techniques, and full hint access • Blue Belt: Unlocks Difficult, Intense, and Expert levels • Red Belt: Unlocks all levels including Brutal and Brain Freeze Whether you're picking up Sudoku for the first time or you're an experienced solver looking to learn advanced techniques, Sudojo is your path to mastery. Terms of Use: https://sudojo.com/en/terms Privacy Policy: https://sudojo.com/en/privacy