IMPORTANT: Before creating issues about generating invalid sudoku

[kaajjo]

All puzzles are tested to have only one possible solution. The algorithm has been tested, but who knows what might happen? So before creating an issue about invalid sudoku, make sure that you:

• Did not make any mistakes. (Also check your mistakes checking setting, it's set to rule violations by default)
• Tested sudoku on independent websites, e.g QQWing or Thonky. (To get your sudoku as string go to History and select a game -> Then tap on three dots and select export as string -> Copy)
  It should have only ONE solution. If it's not or LibreSudoku solution is different ⇾ Create new issue