Polyomino Panel

Dark mode Use a dark color theme throughout the app

Tint closed tiles Shade regions that are fully enclosed: blue (or the shape's colour) if it is a valid tile, hatched red if it can't become one

Step-by-step hints Each hint takes two presses: first it points at where to look, then it shows the move with the full explanation.

Load puzzles from a file Adds a temporary book from a CSV file on your computer. Nothing is uploaded.

Offline play Saves the app and every puzzle book on this device so it works with no internet connection. Updates show up on the visit after you reconnect.

Print puzzles Make a printable booklet from this book, with an optional answer key. Use "Save as PDF" in the print dialog for a file.

Clear saves Erases your progress on every puzzle in this browser. Settings are kept. This can't be undone.