# Iodoku — Elegant Sudoku, Evolved. > AI-powered Sudoku app with adaptive difficulty and learning tools. (iPhone/iPad app by David Seppi.) - Source: https://appshunter.io/ios/app/iodoku/id6753880944 (this page in markdown: same URL + `.md`) - Developer: [David Seppi](https://appshunter.io/developer/1845444357) - Category: Games, Board, Puzzle - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 12 MB - Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan) - Released: 2025-10-28 - Data updated: 2026-08-23 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/iodoku/id6753880944/reviews.md ## What is Iodoku? Challenge your mind with Iodoku, a premium Sudoku app built for players who want more than another puzzle grid. Iodoku helps you solve, learn, improve, and track your growth with a clean interface, natural controls, smart coaching, and a full training system designed around real Sudoku logic. WHY IODOKU LEARN WHILE YOU PLAY Iodoku does not just give you answers. Smart hints guide you toward the next logical step, helping you understand why a move works so you can solve more confidently next time. FAST, NATURAL GAMEPLAY Use classic cell-first entry or Iodoku’s faster digit-first play style: tap a number, see matching numbers highlighted on the board, then tap empty cells to place it. It feels quick, focused, and natural. SOLVE REPLAY After a puzzle, review the logical path step by step. See how the board could be solved using verified techniques, not guesses. TRAIN REAL SUDOKU TECHNIQUES Practice strategies from beginner fundamentals to advanced patterns. Iodoku helps you build skill intentionally instead of hoping the next puzzle teaches you something by accident. TRACK YOUR SUDOKU IQ Follow your progress with stats based on logic purity, accuracy, pace, and solving growth. See where you are improving and what to work on next. DAILY LADDER Take on a guided daily path of puzzles and challenges designed to build momentum, sharpen technique, and keep your brain engaged. ACHIEVEMENTS AND LONG-TERM GOALS Earn badges for clean solves, streaks, difficult puzzles, advanced techniques, and long-term mastery. CUSTOM PUZZLES Enter puzzles from books, websites, newspapers, or your own designs. Bring outside puzzles into a smarter solving environment. MULTIPLE GAME MODES Play classic Sudoku or explore thoughtful variations including Large X, I-Mode, Windoku, Color Channels, and more. BUILT FOR EVERY LEVEL Iodoku is for: • Beginners learning Sudoku for the first time • Casual players who want a cleaner daily puzzle • Intermediate players stuck at the same skill level • Advanced solvers looking for serious techniques • Puzzle lovers who enjoy progress, mastery, and logic FEATURES • Multiple difficulty levels from easy to extreme • Smart hints that teach the next logical step • Solve replay with verified logic paths • Sudoku IQ and detailed progress tracking • Daily Ladder challenges • Achievements and badges • Custom puzzle entry • Advanced training mode • Natural digit-first input option • Classic Sudoku controls option • Auto notes and candidate tools • Mistake checking and coaching options • Pause screen that protects the puzzle • Light and dark mode • Custom themes and highlight colors • Left-handed layout support • Localized interface support • Optional premium ad-free experience PREMIUM Iodoku is free to play with optional Premium upgrades. Premium removes ads and supports continued development of new training tools, variants, polish, and advanced Sudoku features. Whether you are solving your first puzzle or trying to master expert techniques, Iodoku is designed to help you think better, solve cleaner, and enjoy the process. Download Iodoku and start building your Sudoku mind. Terms of Use: https://arcofdescent1.github.io/iodoku-legal/terms.html Privacy Policy: https://arcofdescent1.github.io/iodoku-legal/privacy.html ## Key features - 9 Difficulty Levels - AI-Powered Puzzle Generation - Personal AI Coach - Adaptive Difficulty - Interactive Tutorial - Detailed Statistics - Customizable Themes ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Premium Lifetime | $9.99 | one-time | | Iodoku Premium (Lifetime) | $4.99 | one-time | ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/iodoku/id6753880944/reviews.md ### 5/5 — I love Iodoku! *2025-10-29* Final an app that turns my boredom into brilliance! Smooth design, smart hints, and just the right level of challenge. My brain has never been happier! ## Frequently asked questions about Iodoku ### Does Iodoku have ads? Yes, the free version of Iodoku contains advertisements. Users can remove ads by subscribing to the Premium version. ### What are the subscription options for Iodoku? Iodoku offers Premium Monthly for $0.99/month, Premium Yearly for $9.99/year (saving 17%), and a one-time Premium Lifetime purchase for $14.99. ### Can I try Iodoku before subscribing to Premium? Yes, the free version of Iodoku provides full feature access, including all 9 difficulty levels and the complete tutorial system, allowing you to try it before upgrading. ### How does Iodoku's adaptive difficulty work? Iodoku features adaptive difficulty, meaning the puzzles are designed to grow with your skills. The AI calibrates challenges to perfectly match your current level and help you improve. ### What age rating does Iodoku have? Iodoku is rated 4+ and is suitable for players of all ages. It is designed to be accessible for beginners while offering challenges for experts. ### How often is Iodoku updated? The latest version of Iodoku is 1.0.8, and it was last updated on December 10, 2025. Updates typically include improvements and new features. ### Can I play Iodoku offline? The provided data does not specify if Iodoku can be played offline. However, AI-powered features might require an internet connection for puzzle generation and coaching. ### What devices support Iodoku? Iodoku is supported on iPhones and iPads, offering a clean and intuitive interface optimized for these devices. ## Version history (last 5 releases) ### 2.6 — 2026-08-18 What’s New in Version 2.6 Iodoku 2.6 delivers our most ambitious upgrade yet, with deeper puzzles, smarter guidance, and a more polished solving experience. New production-ready Fiendish, Devilish, and Esoteric difficulty levels Original, offline top-tier puzzles built around advanced solving techniques Instant, trusted puzzle loading at every advertised difficulty Progressive hints that guide you from a gentle nudge to a complete explanation Solve Replay records your actual solving journey for review and coaching “Resume My Thinking” restores your context when returning to a game Editorial puzzle collections and curated challenges available offline Improved continuity across the app, widgets, shared puzzles, and saved games A first-run Speed Lesson introduces Iodoku’s efficient input system Expanded VoiceOver support for a complete, accessible solving workflow Smarter difficulty validation, puzzle integrity checks, and training exercises Refined localization and interface polish throughout the app Performance, reliability, and accessibility improvements Every puzzle remains playable offline, with no server connection required. ### 2.5.1 — 2026-08-06 Iodoku is now faster, smarter, and more personal. • Learn the efficient input system with a new speed lesson • Revisit your actual solve and resume your train of thought • Get progressive hints that teach without giving everything away • Enjoy instant, carefully validated puzzles at every difficulty • Discover curated editorial puzzles and challenges • Continue seamlessly across sessions and share your achievements • Solve from start to finish with an improved VoiceOver experience • Enjoy additional refinements, accessibility improvements, and bug fixes ### 2.5 — 2026-07-05 Iodoku has grown into a full Sudoku learning and improvement system. NEW IN THIS UPDATE • Daily Ladder A guided daily challenge path designed to build skill and momentum. • Solve Replay Review completed puzzles step by step and see the verified logical path through the board. • Sudoku IQ Track your growth with progress insights based on logic purity, accuracy, pace, and solving consistency. • Smarter Hints Hints now focus on teaching the next logical step instead of simply giving away answers. • Training Improvements Technique practice is faster, clearer, and better aligned with real Sudoku solving. • Achievements Earn badges for milestones, clean solves, streaks, advanced play, and long-term mastery. • Game Library Resume unfinished puzzles or review completed games. • Custom Puzzle Support Enter puzzles from books, websites, newspapers, or your own designs. • Improved Controls Digit-first play, better note tools, clearer highlighting, and more flexible gameplay settings. • More Game Modes Classic Sudoku plus thoughtful variants including Large X, I-Mode, Windoku, and Color Channels. • Premium Polish Cleaner menus, improved layout, localization support, better settings, and a more refined overall experience. This update is focused on making Iodoku not just a Sudoku app, but a place to learn, improve, and enjoy the logic behind the game. ### 2.0.1 — 2026-06-10 What’s New in 2.0.1 Iodoku 2.0.1 focuses on polish, playability, and launch-ready refinement. Improved landing page layout and ad presentation Added cleaner banner ad spacing for supported free play Refined premium upgrade and ad-removal flow Improved keypad behavior, including completed digit graying Added smoother note handling and auto-remove candidate support Improved resume and game library behavior Refined error checking, coaching, and hint controls Updated versioning and submission metadata for the 2.0.1 release General performance, stability, and interface polish across the app Iodoku 2.0 is a major upgrade focused on polish, smarter play, and long-term progression. • Redesigned home screen with cleaner navigation • Added game library for resuming unfinished puzzles and reviewing completed games • Added statistics, progress tracking, Sudoku IQ insights, badges, and achievements • Added custom puzzle creation and import • Added fast digit-first entry mode alongside traditional cell-first play • Added bookmarks, puzzle reset, check puzzle, candidate tools, and improved pause behavior • Added coaching modes and smarter hint support • Expanded training with more technique-focused lessons • Added Large X, I-Mode, and Color Channels variants • Added Premium ad-free upgrade and ad-supported free play • Improved app branding, layout, sounds, haptics, and overall polish ### 2.0.0 — 2026-05-29 Iodoku 2.0 is a major upgrade focused on polish, smarter play, and long-term progression. • Redesigned home screen with cleaner navigation • Added game library for resuming unfinished puzzles and reviewing completed games • Added statistics, progress tracking, Sudoku IQ insights, badges, and achievements • Added custom puzzle creation and import • Added fast digit-first entry mode alongside traditional cell-first play • Added bookmarks, puzzle reset, check puzzle, candidate tools, and improved pause behavior • Added coaching modes and smarter hint support • Expanded training with more technique-focused lessons • Added Large X, I-Mode, and Color Channels variants • Added Premium ad-free upgrade and ad-supported free play • Improved app branding, layout, sounds, haptics, and overall polish ## More apps by David Seppi - [ListenLeaf](https://appshunter.io/ios/app/listenleaf/id6757962999) - [Kinsei](https://appshunter.io/ios/app/kinsei/id6758316582) - [Chessapeake](https://appshunter.io/ios/app/chessapeake/id6788574785) All apps by David Seppi: https://appshunter.io/developer/1845444357 --- *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 2026-08-23.*