Flouri Sudoku: Offline Puzzles

Sudoku that feels like doing it on paper with your favourite pen, and puzzles that are as hard as they say they are. It works fully offline, so it's good for the train or a flight.

SIX DIFFICULTY LEVELS
From Beginner to Fiendish. Each level is graded by the solving techniques a puzzle needs, not by how many numbers are missing. Easy puzzles can be solved by scanning alone, with no pencil notes. Hard and above bring in pairs, pointing, X-Wings and more.

HINTS
If you get stuck, a hint shows you the next logical step and explains why it works, from "7 can only go in one square of this box" up to an X-Wing. It won't just fill in the answer for you. Each new technique comes with a short lesson when you unlock it.

A DAILY PUZZLE
A new puzzle every day, the same one for everyone. Keep a streak going, earn streak freezes for busy days, and stamp each day in your calendar. You can also turn on a reminder, which won't go off once you've played that day.

PAPERS & PENS
Every number you write is drawn stroke by stroke in ink. Level up to open stationery boxes and collect papers, pens, handwriting styles and stamps, including kraft paper, a fountain pen, a chalkboard and gold-leaf ink.

EVERYTHING YOU'D EXPECT
• Pencil notes that tidy themselves as you fill in numbers
• Undo, and highlighting of matching numbers
• Mistake checking: off, clashes only, or every mistake
• Square-first or number-first input
• A journal of every puzzle you've finished, a stats page and personal bests
• An optional timer (your time doesn't affect your score)

FREE, OR SUPPORT IT ONCE
Beginner to Hard are free, with a short ad after some puzzles. A one-off Supporter purchase (not a subscription) unlocks Expert and Fiendish puzzles, removes ads, and gives you unlimited hints, missed dailies to catch up on and a "Fill notes" button.

PRIVACY
There's no account or sign-up, and your progress is saved on your phone. Flouri Sudoku doesn't collect anything about you. Ads for free players come from Google, and you can choose your privacy settings.