FAQ Free Sudoku Online
When does Today's puzzle change?
At 00:00 UTC. The date comes from the server, not your device clock, so a wrongly set phone still gets everyone else's puzzle.
Why wasn't my time accepted?
It is rejected if the replayed moves do not solve the grid, hints were used, the server never saw you open the puzzle, or the time is implausibly fast: under 25 s on Easy, 45 s on Normal, 75 s on Hard or 110 s on Expert, or under 0.1 s per move on average.
Can I leave a puzzle and finish it later?
Yes. Every move is saved on your device, and when you return the game asks whether to continue or start fresh. A saved Today's puzzle from an earlier date is discarded.
What if my duel opponent disconnects?
Your screen counts down the seconds they have to return. If they do not, you win with the reason 'Opponent did not return'.
Can I play with a controller?
A standard-layout controller drives an on-screen pointer: the left stick moves it and A taps. The D-pad acts as the arrow keys, B as Esc and Start as Enter; not every device has been tested.
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