Simple Sudoku

Sudoku that works, everywhere, with nothing in the way. No adverts, no accounts, no sign-in, and no internet connection required, not for the first puzzle, and not for the ten thousandth. And again, no ads.

Every puzzle is generated on your device the moment you ask for it. Nothing is downloaded, so nothing runs out, and the game starts instantly whether you are on a train, on a plane, or somewhere with no signal at all.

FOUR DIFFICULTIES, GRADED PROPERLY
Easy, medium, hard and master. The difficulty is decided by the solving techniques a puzzle actually requires, not by counting how many digits are missing. A hard puzzle is hard because it needs a hard technique — so the label means the same thing every time.

MASTER+
For when master is not enough. Every assist is withdrawn: no mistake feedback, no hints, no note tidying. One wrong digit ends the game. Undo cannot save you.

A DAILY PUZZLE
One puzzle a day, the same for every player, with the difficulty rotating through the week.

TOOLS THAT STAY OUT OF THE WAY
Pencil marks, with optional automatic tidying of the notes a placed digit has ruled out. Undo and redo. Hints that explain the next step rather than just filling it in. Mistake feedback you can set to live highlighting, a manual check, or nothing at all.

TRACK YOUR SOLVING
Games played and completed, best and average times per difficulty, current streak and longest streak. Use of a hint or mistake feedback marks a game as assisted, so your unaided record stays meaningful.

BUILT TO BE READABLE
Light, dark and high contrast themes, plus a system option. Optional haptics. A timer you can hide when you would rather not be timed — hiding it does not stop it recording.

REPLAY AND MOVE YOUR PROGRESS
Every puzzle has a short code. Note it down and play the same grid again, or give it to somebody else and compare times. A save code moves your statistics and your game in progress to another device, by hand, with no account.