After classic sudoku has taken hold around the world, publishers and designers have tried to find innovative alternatives to the game, to attract even more players. Among these the Sudoku X.
The Sudoku X 16x16 #1 Very Hard (diagonal sudoku or xSudoku or Sudoku X adds), compared to the classic sudoku, the further element of the two diagonals, from the upper vertex to the lower vertex of the scheme, in which the numbers, from 1 to 9, cannot be repeated.
This peculiarity helps the player in finding the solution.
You have three different game difficulties available, selectable from the panel on the left of the grid.