NineFold Sudoku

Daily Logic Puzzles, Offline

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Graded by technique, not clue count. Today's daily is free; Pro unlocks every past day, unlimited hints and no ads. One payment, offline, always. Most Sudoku apps call a puzzle "hard" because it has fewer clues. NineFold grades every puzzle by the hardest technique it actually takes to solve, so Easy stays easy and Evil earns its name. FIVE HONEST DIFFICULTIES • Easy, Medium, Hard, Expert and Evil, graded by technique, not clue count • From singles up through X-Wings, XY-Wings and coloring • Every puzzle has exactly one solution, reachable by logic alone A DAILY CHALLENGE, FREE EVERY DAY • One new puzzle a day, the same for every player • Missed a day? NineFold Pro unlocks the whole archive, back to day one HINTS THAT TEACH • One tap places the next digit • When the next step only rules candidates out, the hint names the technique and shows the pattern on the grid PLAYS ANYWHERE • Fully offline: no account, no sign-in, no Wi-Fi needed • Your games, stats and streaks are saved on your device EASY ON THE EYES • Light and dark themes, plus two colorblind-safe palettes • Four extra themes with NineFold Pro: Paper, Forest, Ocean and Midnight • Full VoiceOver and large-text support • Every accessibility feature is free, always NINEFOLD PRO The free version is supported by ads. NineFold Pro is a single purchase that removes them, makes hints unlimited, unlocks every past daily and adds four extra themes. It's not a subscription, so it never expires.

Ratings & Reviews

  • 5.0
    out of 5
    1 Ratings

A fresh look, built around what you do next. • Four tabs: Play, Daily, Stats and Settings • Play: pick up where you left off, or start a new puzzle at the level you played last • The board: bigger number keys within thumb reach, and clearly labelled tools • Daily: a calendar of every challenge, with your solved days marked • Stats: your streak first, and a bar for each difficulty • A finished puzzle shows your best time and one clear next step • Four new themes with NineFold Pro: Paper, Forest, Ocean and Midnight Today's daily is still free for everyone. Past days in the archive are now part of NineFold Pro, which also removes ads and makes hints unlimited. Any daily you already started can still be finished.

Version 1.0.0

The developer, NICHOLAS WESLEY ALLEN, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Location
    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Purchases
    • Location
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
NICHOLAS WESLEY ALLEN
Size
43.7 MB
Category
Puzzle
Compatibility
Requires iOS 16.4 or later.
  • iPhone
    Requires iOS 16.4 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
Languages
English
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2026 Nicholas Allen
  • Developer Website
  • Privacy Policy