The Sudoku Method

Coming soon to Google Play

There is always a next move.

The Sudoku Method is logic-only Sudoku for Android. It teaches you how to find that move.

Coming soon to Google Play

1/3 Look in this box

One digit has only one cell left here.

2/3 Find the 5

The highlighted 5s rule out the other empty cells in this box. Only one cell is left for a 5.

3/3 It's a 5

It's the only cell in this box that can hold a 5.

Where to look, why, then the digit. All three count as one hint.

You never have to guess.

Every puzzle has exactly one solution and can be solved by logic alone. Each one is rated by the hardest technique it needs, from Easy to Expert.

Then the easy digits run out.

Pencil marks show what's still possible. The lessons teach you to read them.

X-Wing

In each of these two rows, the 6 has just two cells left, and they line up. So the rest of those two columns can't be a 6.

One idea opens the whole board.

Everything around the board.

Real screens from the app.

The Challenge screen: today's Medium puzzle, your streak and a calendar of the month.
Challenge One puzzle a day in each difficulty, the same for everyone. Solve it on the day to build a streak.
The Lessons screen, with beginner chapters such as Hidden Single and advanced chapters such as Pointing.
Lessons 11 short chapters, from the rules to advanced techniques.
A report after a solve: where the player got stuck, a link to the lesson, and what to try next.
Your report After each solve: your blind spots, the techniques you used and what to try next.

One board. Eight ways to see it.

Onyx

Free

One cell left.

Its row, column and box already hold eight different digits. Which one is missing?

Free to play. One payment for the rest.

Coming soon to Google Play

Free

  • Daily Challenge in four difficulties
  • Play a fresh puzzle whenever you want one
  • Guided hints and a report after each solve
  • Lessons, from the rules to advanced techniques
  • Paper and Onyx themes
  • Ads between puzzles and on the home screen

Premium

One payment, no subscription.

  • No ads
  • Every theme, each with its own colours, type and logo
  • Unlimited mistakes in Challenge and checks in Play
  • Centre marks, cell colours, and multi-select with number lock
  • Ad-free streak freezes
  • The Expert lessons
Is every puzzle fair?
Yes. Every puzzle has one solution and never requires a guess. The daily Challenge is the same for every player, and there are no virtual coins or boosters to buy.
Does it need an account?
No. There is no account and no sign-in, and it works offline. Your games and settings stay on your phone.
Which phones does it run on?
Android 8.0 or newer. On a foldable, the board and tools adapt when you unfold your phone.
Where do I send feedback?
Email thesudokumethod@gmail.com with any feature, theme or technique you'd like to see.