Master complex puzzles with smart highlighting and intelligent hints.

Correct mistakes instantly using the infinite undo and replay.

Puzzles crafted by hand, computer verified. Tasty Sourdough-ku!

Check solutions on the fly to help you solve them with absolute confidence!

Intelligent highlighting

Making a wrong placement highlights it, as well as any other number that it clashes with so you can see where the problem lies!

Hint System

We all get stuck sometimes. With our Intelligent Help feature you can get a hint to get you going again.

Infinite Undo

Made a mistake? Not a problem. You can undo it to your heart’s content. Replay allows you to rewatch how you solved the puzzle to learn from your journey.

Rules validation

Making sure you put your numbers correctly according to the sudoku rules.

Solution checker

Checks against the solution for this puzzle. It’s non-intrusive and can be turned off if you’d rather try on your own first.

Cloud Save

Taking a break? Come back and continue your puzzle anytime. There is never any rush with our game.

Daily challenges

Every day there is a new sudoku puzzle for you to solve.

Scoring leaderboards

For the competitive puzzlers among us, climb the Daily Challenge Leaderboards.

Passthrough everywhere

Wherever you are, stay aware of your surroundings with our passthrough. Tired of reality? You can turn it off for a fully immersive experience.

Handset puzzles

All of our puzzles are handset and come in different sizes!