You must fill out the boxes so that each row in each box (3x3), we have the numbers 1 to 9. But! There can be only single digit per line per box.
Sudoku game (Royal Sudoku)
Sudoku game (Angel Sudoku)
Sudoku game (Japanese Sudoku)
Ninja Sudoku
Sudoku game (Samurai Sudoku)
Sudoku game (Sudoku Mix)