Iodoku

Challenge your mind with Iodoku 2.0: a smarter, cleaner Sudoku experience with guided hints, progress insights, achievements, custom puzzles, and fresh game modes.

Challenge your mind with Iodoku, a polished Sudoku app designed for thoughtful play, steady improvement, and satisfying daily logic.

Iodoku 2.0 brings a cleaner experience from the first screen to the final square. Start a new puzzle, resume an unfinished game, review completed boards, import a puzzle from a book or website, or train specific solving techniques when you want to sharpen your skills.

Whether you prefer a relaxed solve or a serious challenge, Iodoku gives you the tools to play your way.

SMART SUDOKU

• 12 difficulty levels from Very Easy to Esoteric • Logic-aware puzzle generation • Smart hints that explain the next useful step • Coaching modes for silent play, gentle nudges, or deeper analysis • Built-in puzzle checking and error handling options • Classic Sudoku plus Large X, I-Mode, and Color Channels variants

PLAY FASTER, YOUR WAY

• Traditional cell-first entry • Fast digit-first entry for quicker solving • Pencil mode with long-press reversal • Calculate all candidates and clear candidates • Bookmark and return to a board state • Reset puzzle and pause without revealing the board

LEARN AND IMPROVE

• Guided training for Sudoku techniques • Strategy explanations that teach the logic behind moves • Statistics, progress tracking, and Sudoku IQ insights • Achievements and badges for short-term goals and long-term mastery • Game library for active, abandoned, and completed puzzles

CUSTOMIZE THE EXPERIENCE

• Light and dark appearance support • Custom board colors • Left-handed layout options • Adjustable number pad behavior • Mistake handling: allow, highlight, or prevent • Optional sounds, haptics, timer, and visual assistance

CUSTOM PUZZLES

Bring in puzzles from books, newspapers, websites, or your own creations. Iodoku can help validate imported puzzles so you can solve them with the same tools, hints, and checking available in generated games.

PREMIUM

Iodoku is free to play with ads. Upgrade to Premium to remove ads and support continued development.

Premium Monthly: $0.99/month, automatically renews monthly Premium Yearly: $5.99/year, automatically renews annually Premium Lifetime: $9.99, one-time purchase for lifetime ad-free access

Payment will be charged to your Apple ID at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. You can manage or cancel subscriptions in your App Store account settings.

Terms of Use: https://arcofdescent1.github.io/iodoku-legal/terms.html Privacy Policy: https://arcofdescent1.github.io/iodoku-legal/privacy.html

Download Iodoku and challenge your mind today.