Question 1

What are the basic rules of Sudoku?

Accepted Answer

Fill the grid so each row, column, and 3×3 box contains digits 1–9 without repetition. The puzzle must have a single, unique solution.

Question 2

How does the Daily Challenge work?

Accepted Answer

A deterministic seed generates the same puzzle for everyone each day. The puzzle resets at midnight in your local timezone.

Question 3

Do puzzles always have a single solution?

Accepted Answer

Yes. Our generator validates uniqueness by counting solutions and reverts any clue removals that would introduce multiple solutions.

Question 4

Can I share my daily result?

Accepted Answer

Yes — use the Share action on the Daily or win dialog. It uses the Web Share API or copies a pre-formatted text to your clipboard.

Question 5

How do difficulty levels differ?

Accepted Answer

Difficulty is an approximation based on the number of given clues. Fewer givens generally require more complex logical deductions to solve.

Frequently Asked Questions