Hard Sudoku #1468064 https://www.livesudoku.com/en/sudoku/hard/1468064

Medium Sudoku #661798 https://www.livesudoku.com/en/sudoku/medium/661798

Beginners Sudoku #86949 https://www.livesudoku.com/en/sudoku/easy/86949

Evil Sudoku #1846028 https://www.livesudoku.com/en/sudoku/evil/1846028

Hard Sudoku #1400910 https://www.livesudoku.com/en/sudoku/hard/1400910

Beginners Sudoku #422602 https://www.livesudoku.com/en/sudoku/easy/422602

Medium Sudoku #725932 https://www.livesudoku.com/en/sudoku/medium/725932

Evil Sudoku #1747458 https://www.livesudoku.com/en/sudoku/evil/1747458

Evil Sudoku #1861055 https://www.livesudoku.com/en/sudoku/evil/1861055

Evil Sudoku #1548667 https://www.livesudoku.com/en/sudoku/evil/1548667