Sudoku Ninequill

Ninequill is a calm 9×9 sudoku for people who like to think a puzzle through. Every puzzle can be solved by logic alone, so you never have to guess. There is a new puzzle every day, unlimited play at every level, and hints that show you how to find the next step rather than just giving it away.

A PUZZLE EVERY DAY
• A new daily puzzle, and each one you solve adds a tile to your wall
• Every past day stays open in the archive
• A streak with one rest day a week
• Copy your result as text to share it

FIVE LEVELS
• From gentle to master, graded by the techniques a puzzle needs, not by how many digits it shows
• Unlimited puzzles at every level, beside the daily one
• A game in progress waits for you

HINTS THAT TEACH
• Unlimited hints in four steps: where to look, the name of the technique, why it works, then the move itself
• Stop at any step and finish the thought yourself
• Learn 23 techniques with short notes, worked examples and exercises
• A notebook keeps track of the techniques you have met

PLAY YOUR WAY
• Notes and auto notes, tidied for you after each placed digit
• Unlimited undo and redo
• Enter by cell first or by digit first, with a count of the digits left
• Mistake checking in four modes, from off to instant
• Large view zooms in on one 3×3 box
• Light and dark looks, optional timer, sound and vibration
• Statistics: best times, solves without hints, a calendar and your techniques

GOOD TO KNOW
• Free to play, with occasional ads between games
• No lives and no limits
• No account needed, and it plays without internet
• Save your progress to a file when you move to a new phone

LANGUAGES
The app is available in English, Turkish, Spanish, Portuguese, French, German, Italian, Dutch and Polish.