Asterisk Sudoku there is an additional area, shown on the grid by shading nine specially selected cells. Those nine cells must also contain 1 to 9.
Anti-Knight Asterisk Sudoku Additional Rules
Anti-Knight Sudoku all cells at a chess knight move (at a distance of 2 by 1) must hold different numbers.
Asterisk Sudoku there is an additional area, shown on the grid by shading nine specially selected cells. Those nine cells must also contain 1 to 9.
Anti-Knight Asterisk Sudoku= Anti-Knight Sudoku + Asterisk Sudoku