The daily Sudoku

Why everyone gets the same board

The puzzle is generated from the date itself, so the grid you are looking at is the grid everybody else is looking at today. Nothing is stored and nothing is fetched — the same date always produces the same board, which is what makes it meaningful to compare a time with a friend or argue about how hard today’s was.

It rolls over at midnight UTC. All four difficulties are seeded separately, so easy and expert are genuinely different puzzles rather than the same solution with more or fewer givens.

Every board has exactly one solution

Cells are removed one at a time and any removal that would leave the grid ambiguous is put back. That guarantee matters most on a daily puzzle, because everybody is solving the same thing: if a board had two valid answers, half the people finishing it would be finishing a different puzzle from the other half.

It also means you never need to guess. If today’s expert looks impossible, there is a deduction available — usually a hidden single or a naked pair — rather than a fork in the road.

Streaks, and the calendar

The board on this page is stateless by design: no login, nothing to remember, just today’s puzzle. The daily challenge in the app keeps the parts that need memory — a browsable calendar so you can go back and play days you missed, streak tracking, and daily quests that pay coins toward board themes.

On the web you can still play backwards through the August 2026 puzzles a date at a time, or open the full daily archive to reach any month since it started.

Making it competitive

A daily puzzle is a natural thing to race, because the fairness problem solves itself — same board, same day, no advantage. Comparing times with a friend needs nothing more than both of you playing it.

If you would rather race in real time than compare afterwards, that is what 1v1 is for: the same grid for both players, live, with cells disappearing as your opponent takes them. Or share one board and solve it together in co-op.