Daily Sudoku: Calm Logic

Classic Sudoku with Daily Challenge. Notes, auto-check, stats, and auto-save. Free daily hints, light & dark themes, play offline—clean design for focused solving.

Tired of cluttered Sudoku apps full of ads?

This is a calm classic 9×9 built for focus. New players learn row, column, and box rules in a short interactive tutorial (about 30 seconds), then jump into Daily Challenge. Pick Easy to Expert, use pencil-mark notes, track streaks and stats—and play fully offline with no ads. Five minutes on a commute or a quiet hour before bed both work.

WHY PLAY HERE • New to Sudoku? Interactive tutorial gets you started in about 30 seconds • Daily Challenge builds a simple brain-training habit • Easy → Expert difficulty so you grow at your pace • Ad-free, minimal interface—stay in the flow • Offline puzzle play—no connection required • Auto-save: pause anytime, resume later

FREE TO PLAY • Classic Sudoku across multiple difficulty levels • Daily Challenge with streak tracking • Interactive how-to-play tutorial (replay anytime in Settings) • Pencil-mark notes for candidate digits • 3 hints per day for free users (as shown in the app) • Matching-number highlight, auto error check, undo & erase • Light and dark base themes • Detailed game statistics

MEMBERSHIP (In-App Purchase) • Unlimited hints when you need a nudge • Premium board themes for comfortable long sessions • Member benefits expand over time (see Membership in the app)

Available plans (pricing and trials shown in the app and on the App Store): • Monthly subscription (auto-renewable) • Yearly subscription (auto-renewable; free trial may be offered) • Lifetime access (one-time purchase, not a subscription)

Subscription terms: • Payment is charged to your Apple ID account at confirmation of purchase • Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period • Your account will be charged for renewal within 24 hours prior to the end of the current period • Manage or cancel subscriptions in Settings → Apple ID → Subscriptions • For refunds and billing, contact Apple Support

HOW TO PLAY Fill the 9×9 grid with digits 1–9 so each row, column, and 3×3 box contains each number once. Every standard puzzle has one solution. Prefer learning by doing? Open the interactive tutorial from Settings → How to Play anytime.

LEGAL • Privacy Policy: https://iorangepie.com/common/ios/shudu/privacy-policy-en.html • Terms of Service: https://iorangepie.com/common/ios/shudu/terms-of-service-en.html • Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

By using this app, you agree to the above terms.