NOXTRI · SUDOKU

A calm sudoku with hints that teach.

Stuck? Kareli first shows where to look, then names the technique and explains it, and only then, if you want, the answer. A new daily puzzle for everyone, every puzzle solvable by logic alone, and your own book puzzles copied in by photo.

  • Daily puzzle
  • Hints that teach
  • From a book
  • No ads
  • No account
Download on the App Store
The daily puzzle with the week strip and your streakA hint at the answer step: Locked Candidates drawn on the boardA puzzle copied from a book, checked and graded

A HINT IN THREE STEPS

  1. 1Where

    Kareli highlights the row, column or box to look at. Often that is all you need.

  2. 2Technique

    It names the technique, such as Hidden Single or Locked Candidates, and explains how it works here.

  3. 3Answer

    Only if you ask: the step is drawn on the board, cells highlighted and removable candidates crossed out.

FOUR LEVELS, NO GUESSING

Easy
Plenty of clues, only the basics
Medium
Singles are all you need
Hard
Locked candidates and pairs
Expert
X-Wing, Y-Wing and triples

IN THE APP

A puzzle every day
Everyone gets the same daily puzzle. Monday starts easy and Sunday reaches expert. Keep your streak and share a result card that never gives away the solution.
Copy from your book
Take a photo of a printed sudoku and Kareli reads the digits on your phone, or type it in. It checks the puzzle has one solution and tells you how hard it is.
Your technique notebook
Every technique you meet in a hint is collected with a short explanation, so you can see how far you have come.
Made to be comfortable
Large digits, light and dark themes, pencil notes, auto-fill candidates, unlimited undo, and mistake checking you can turn off. English and Turkish.

Free, with no ads, no in-app purchases and no account. Your progress stays on your device and the app works offline. Photos of puzzles are read on your device and never uploaded.