Count different Sudoku

  • Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions.
  • Arrows and numbers outside gridding means how many different numbers in corresponding direction grid.
  • Count different Sudoku

    Sudokus that no one can solve

    Sudokus that no one can solve, not only including Sudokus which are very difficult but also those that no one has tried to solve.