Good to know.

No. You can continue as a guest. If you’d rather sign in, the app offers Apple, Google or email.

No. It’s a sample Classic made in your browser, so you can try the controls. The four variants, the daily puzzles, the packs, your streaks and your stats are in the app.

There are no starting digits. Dashed cages group cells, and the small number in each cage is the sum of its cells. A digit can’t repeat inside a cage, and the usual row, column and box rules still apply.

A 12×12 board holds four overlapping 9×9 grids. Each of the four follows the normal rules, so a square in an overlap has to work in more than one grid.

It counts as a strike. With the default limit of three, the third strike ends the puzzle. You can change the limit under Mistake Limit in your profile.

At midnight. The Daily tab shows how long is left before the next set.

Yes. Sign in and your progress syncs across your devices.

The daily puzzles and the first pack of each variant. Premium packs add more puzzles, and Restore Purchases brings them back on a new device.