Sudojo vs MentalMather

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 • See your solving skills grow over time 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 or scan from paper • 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 • Works on iPhone, iPad, and Mac 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

MentalMather measures your daily cognitive performance through mental math — not to teach you math, but to measure how sharp your brain is right now. HOW IT WORKS Take a quick Sharpness Test each day. The app compares your speed across addition, subtraction, multiplication, and division against your own historical baseline. The result is your Sharpness Score — a personalized metric that tells you whether you're performing above or below your norm. This isn't about getting better at math. It's about measuring your cognitive throughput. When your working memory is firing on all cylinders, you solve problems faster. When it's not — due to poor sleep, stress, or fatigue — your score reflects that. FEATURES - Sharpness Score — your daily cognitive performance metric, personalized to your baseline - Guided Assessment — finds your ideal difficulty level automatically - Quick Play — practice at your own pace with customizable difficulty, timing, and operations - Challenge Mode — create challenges and share them with friends via code or QR, then compare results - Detailed History — every session tracked with per-problem breakdowns and solve times - Stats & Analytics — sloppiness tracking, personal bests, per-operation performance - Light & Dark themes — premium dark mode with metallic design, clean light mode - Haptic feedback — feel your correct and incorrect answers - Works offline — all your data stays on your device WHY MENTALMATHER Most brain training apps are games disguised as science. MentalMather is a measurement tool. Your Sharpness Score compares you against yourself — not against strangers on a leaderboard. The question isn't "are you good at math?" It's "how sharp are you today compared to your own baseline?" Built for people who care about their cognitive performance and want a quick, honest daily check-in.