Iodoku

Go beyond solving. Iodoku teaches the logic behind every move with smart hints, training, solve replay, Sudoku IQ, and daily challenges.

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