Play Other Hard Level
Sudoku Hard
This Web Sudoku is specially made for players who want more challenge from sudoku game, which is hard level with 26-22 clues. This 9×9 sudoku game has 81 number boxes, so if you subtract the number of clues from the hard level of 81 – 26 = 55 boxes that you must fill in on this hard sudoku level. Below is a table of difficulty levels on hard-sudoku.com
Sudoku Level Difficulty
Daily Hard Sudoku
Play Instruction
- Click the ‘PLAY HARD SUDOKU’ button to start the game and the timer will also start.
- Click a number 1~9 below or press a key of 1~9 in keyboard to get a number in hand. then, click on the cell to put a number
- Click a selected number below one more time to toggle note mode on/off or Press shift to toggle note mode on/off.
Frequently Asked Questions
What is Hard Sudoku?
Hard Sudoku is a logic-based number puzzle played on a 9×9 grid with few clues, about 22 to 26 clues. The goal is to fill the grid with numbers so that each column, each row, and each of the nine 3×3 sub grids contains all the numbers from 1 to 9 without repetition.
Are there different levels of hard difficulty in Sudoku?
Yes, web hard-sudoku.com divides 3 difficulty levels in hard level, namely, hard level with 26 clues, harder level 24 clues and hardest level with 22 clues.
Are there any more difficult puzzles than hard level sudoku?
Yes, there is Sudoku Evil level with 17 clues, which means you have to fill 64 number boxes on sudoku evil.
How do I use the note marking option?
Click on the blue answer number twice or click the center/mouse wheel or Press shift to toggle note mode on/off.