Your puzzles
The library, the history, and named save points.
The Puzzles button in the top bar opens three lists of your own puzzles. All of them live in this browser only; nothing is sent anywhere.
Library
Type a name and choose Save current to keep the puzzle you are playing. Each entry shows its name and the date you saved it, with Open to load it again and Delete to remove it. Only the puzzle itself is stored: opening it rates it again and starts a fresh game, so the timer and your notes start empty.
History
Every puzzle you start is listed here, newest first, with its difficulty, score and the time you spent on it. A tick marks the puzzles you finished. Open plays one again and Delete removes a single entry; Clear history empties the list. The list is capped, so the oldest entries drop off by themselves.
Save points
A save point is a named snapshot of the game as it is now: the values, your pencil marks and your colours at the moment you saved it. Choose Save current position to make one, then Restore to return to it later. Restoring does not cross the undo history, so Undo stays on the restored position. Unlike the autosave, which always follows your latest move, a save point stays where you left it.