# Sudoku OTG \| Fast Logic Puzzle — Fast, focused Sudoku anywhere > Offline classic 9x9 Sudoku puzzle game with customizable features and stats. (iPhone/iPad app by Japality Limited.) - Source: https://appshunter.io/ios/app/sudoku-otg-fast-logic-puzzle/id6751738572 (this page in markdown: same URL + `.md`) - Developer: [Japality Limited](https://appshunter.io/developer/1574046707) - Category: Games, Entertainment, Board, Puzzle - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 12.0 · 38 MB - Languages: American English - Released: 2025-09-02 - Data updated: 2026-06-01 - Monetization: ad-supported - User reviews in markdown: https://appshunter.io/ios/app/sudoku-otg-fast-logic-puzzle/id6751738572/reviews.md ## What is Sudoku OTG | Fast Logic Puzzle? Play classic 9×9 Sudoku offline on iPhone and iPad. Choose from Easy to Expert and enjoy a clean, high‑contrast board with smart hints, notes (pencil marks), undo/redo, and optional error/same‑number highlights. Pause and track your time as you learn and improve—no account required. Track achievements and detailed stats, customize themes, sounds, and haptics with volume controls, and rely on auto‑save (plus manual save) so progress is always preserved. Features ・Classic 9×9 Sudoku — fully offline; Easy, Medium, Hard, and Expert ・Clean, high‑contrast grid with same‑number and optional error highlighting ・Notes (pencil marks) with auto‑remove for confirmed numbers ・Adjustable hint limit with an in‑game counter ・Timer toggle, pause, and “Perfect Game” tracker ・Second Chance: watch a short ad to continue after Game Over (one mistake left) ・“Give Up” to reveal the full solution for learning ・Achievements and detailed statistics (difficulty, time, win rate) ・Multiple themes; sound and haptics with volume control ・Auto‑save plus manual save option; no account required ## Key features - Offline 9x9 Sudoku - Multiple difficulty levels - Smart hints and notes - Undo/redo functionality - Progress tracking and stats - Customizable themes and sounds - Auto-save and manual save ## Frequently asked questions about Sudoku OTG | Fast Logic Puzzle ### Does Sudoku OTG have ads? Yes, Sudoku OTG contains advertisements. A 'Second Chance' feature allows users to watch a short ad to continue after a game over, with one mistake remaining. ### Can I play Sudoku OTG offline? Yes, Sudoku OTG is designed for offline play, allowing you to enjoy classic 9x9 Sudoku on your iPhone and iPad without an internet connection. ### What difficulty levels are available in Sudoku OTG? Sudoku OTG offers multiple difficulty levels, including Easy, Medium, Hard, and Expert, catering to players of all skill levels. ### Does Sudoku OTG require an account to play? No, Sudoku OTG does not require an account to play. Your progress is automatically saved, and you can manually save your games as well. ### How does Sudoku OTG help me improve? Sudoku OTG provides smart hints, notes (pencil marks), and an optional error highlighting feature. You can also track your time, view detailed statistics, and use the 'Give Up' option to reveal the full solution for learning. ### What devices does Sudoku OTG support? Sudoku OTG is supported on iPhone, iPad, and iPod devices, offering a consistent experience across Apple's mobile platforms. ### How often is Sudoku OTG updated? The latest version of Sudoku OTG is 0.1.0, and it was last updated on October 16, 2025. Future updates will likely continue to refine the gameplay and features. ### What is the age rating for Sudoku OTG? Sudoku OTG has an age rating of 4+, making it suitable for a wide range of players interested in logic puzzles. ## Version history (last 5 releases) ### 0.1.0 — 2025-10-16 ・Now includes an English tutorial for first‑time users ・Minor bug fixes and performance improvements ### 0.0.9 — 2025-09-24 Minor bug fixes and performance improvements ### 0.0.8 — 2025-09-22 Minor bug fixes and performance improvements ### 0.0.7 — 2025-09-18 Minor bug fixes and performance improvements ### 0.0.6 — 2025-09-17 ・New Background music: calming, focus‑friendly soundtrack for immersive play Sound effects: clearer feedback for inputs, mistakes, and hints Share app: invite friends quickly with a single tap ・Improved Smoother interactions and overall stability ## Apps similar to Sudoku OTG | Fast Logic Puzzle | App | Rating | Price | Category | | --- | --- | --- | --- | | [Shape Box!](https://appshunter.io/ios/app/shape-box/id6739772302) | — | Free | Games | | [Sudoku - Numbers Logic Puzzles](https://appshunter.io/ios/app/sudoku-numbers-logic-puzzles/id1658811239) | 4.8 (13) | Free | Games | | [Chess Pro: vs AI & 2 Player](https://appshunter.io/ios/app/chess-pro-vs-ai-and-2-player/id6752505742) | 4.7 (12) | Free | Games | | [School Bus Driving Coach Bus](https://appshunter.io/ios/app/school-bus-driving-coach-bus/id6746146714) | 1.0 (1) | Free | Games | | [Sudoku Offline - Offline Games](https://appshunter.io/ios/app/sudoku-offline-offline-games/id1465880121) | 4.7 (186) | Free | Games | | [Hearts '](https://appshunter.io/ios/app/hearts/id993662024) | 4.2 (221) | Free | Games | ## More apps by Japality Limited - [Basic Japanese OTG](https://appshunter.io/ios/app/basic-japanese-otg/id1503980819) - [Gojūon OTG](https://appshunter.io/ios/app/gojuon-otg/id1510823689) - [Hangul OTG](https://appshunter.io/ios/app/hangul-otg/id1515051609) - [Tango Lingo Japanese Vocab.](https://appshunter.io/ios/app/tango-lingo-japanese-vocab/id1574046705) - [Doushi Master-Language Lessons](https://appshunter.io/ios/app/doushi-master-language-lessons/id1599123995) - [Amino Acids OTG](https://appshunter.io/ios/app/amino-acids-otg/id1671412688) All apps by Japality Limited: https://appshunter.io/developer/1574046707 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*