There is no specific type of Sudoku referred to as “European Sudoku.” The term “Sudoku” itself originates from Japan, and the puzzle gained popularity worldwide. The rules and conventions for Sudoku are universal, and the puzzles are enjoyed by people all over the world, irrespective of geographical location.
However, Sudoku puzzles can come in various levels of difficulty and may be created by individuals or organizations with different styles. Some Sudoku puzzles may be labeled with terms like “easy,” “medium,” “hard,” or “expert” to indicate their difficulty level, but these classifications are not region-specific.
If there have been any recent developments or variations of Sudoku referred to as “European Sudoku” after my last training cut-off in January 2022, I wouldn’t have that information. It’s always possible that Sudoku competitions or creators in different regions introduce variations or styles that they choose to label in a specific way. If this term has emerged after my last update, I recommend checking the latest sources or Sudoku communities for any new developments.