| sudoku online hard level | 1.03 | 0.6 | 9893 | 24 | 81 |
| sudoku medium hard level | 1.41 | 0.1 | 1902 | 24 | 44 |
| sudoku online very hard | 1.88 | 0.2 | 4679 | 23 | 76 |
| hard level sudoku printable | 0.74 | 0.7 | 9137 | 27 | 28 |
| sudoku online easy to hard | 0.61 | 1 | 8133 | 26 | 84 |
| sudoku puzzles hard level | 0.76 | 1 | 5003 | 25 | 60 |
| tips for sudoku hard level | 0.68 | 0.3 | 1150 | 26 | 76 |
| sudoku online free hard | 0.17 | 0.3 | 8059 | 23 | 47 |
| hardest level of sudoku | 0.57 | 0.7 | 9683 | 23 | 18 |
| sudoku game online hard | 0.68 | 0.3 | 4829 | 23 | 69 |
| free online sudoku very hard | 1.52 | 0.4 | 3218 | 28 | 67 |
| play sudoku online hard | 1.36 | 0.1 | 4875 | 23 | 53 |
| sudoku most difficult level | 1.94 | 0.4 | 2757 | 27 | 6 |
| sudoku free very hard | 0.76 | 0.6 | 9311 | 21 | 69 |
| sudoku hardest online daily | 1.75 | 0.9 | 8417 | 27 | 76 |
| sudoku game very hard | 1.77 | 0.5 | 2774 | 21 | 16 |
