Live, timed, multiplayer Sudoku — open a lobby of your own or join one, at Easy, Medium or Hard.
Any player can open a tournament: pick Easy, Medium or Hard, and a length of 15 minutes, 30 minutes or one hour. Other players see it in the tournament list and can join or leave freely until it begins — guests included. Once it starts, the field is locked and everyone races the same puzzles on the same clock. Scheduled global tournaments are paused for now, so every event on the list is one a player opened.
Two rules keep the list honest: a player can only be in one timed game at a time, and a tournament with fewer than two players at its start time is cancelled automatically rather than being scored as a solo walkover. Finished tournaments are cleared from the list twelve hours after they end.
Your score reflects both what you solved and how fast. Harder puzzles are worth more, and a time bonus rewards finishing early. Crucially, an unfinished grid still scores: partial credit is awarded for correct progress, so a near-miss on a Hard puzzle can beat a comfortable finish on an easy one and there is never a reason to stop trying.
Each puzzle carries a value inside a per-difficulty band — Easy 100–999, Medium 1,000–1,999, Hard 2,000–4,999, Extreme 5,000–7,999, Diabolical 8,000–9,999 — so a puzzle's worth is comparable anywhere on the site. Your tournament total is the sum of every puzzle you scored on, so it climbs past a single band as the event goes on. A tournament is rated once at least two signed-in players take part, and their ratings all settle together when the event finalises. Guests are welcome but play unrated.
A live leaderboard updates through the event, and if you are not entered in that tournament yourself you can spectate — hit Watch on any active competitor's row to see their board fill in as it happens.
Competitive rules apply throughout: no pausing the clock, assist tools disabled, and switching tabs blurs your board. The Fair Play Policy sets out the full detail.
Scheduled global tournaments are paused for now. Any player can open a tournament at any time — Easy, Medium or Hard, 15 minutes to one hour — and other players join it from the tournament list.
No. You can join a tournament as a guest, and open one of your own, and you appear on the live leaderboard for that tournament under an auto-assigned Guest name. An account is what makes your result rated and puts you on the global rankings. Signing in uses Internet Identity, so there is no password and no email required.
You still score. Partial credit is awarded for correct progress, so an unfinished Hard grid can outscore a completed easier one.
No. You can be in one tournament at a time, and you cannot start another timed event while one is running.
A tournament with fewer than two players at its start time is cancelled automatically, and no rating changes hands.