Sudoku games on this webpage are for experienced players. They are extremely difficult and may not be solved in hours. It is recommended to print and work on them on paper.

Relatively easier (still very hard) level 3 puzzles can be found from links below.

Daily sudoku (X-wing training).

Daily sudoku (XY-wing training).

Daily sudoku (XYZ-wing training).

Daily sudoku (Skyscraper training).

Daily sudoku (Kite training).

Daily sudoku (swordfish training).

Daily sudoku (jellyfish training).

Level 4 sudoku games on this website need to use divide-and-conquer technique once. That is, for a square with two possible numbers, to try for each number to check the outcome. Every time a divide-and-conquer technique is used, the level of the puzzle goes up by 1. For example, a level 8 sudoku puzzle on this website usually needs to use the divide-and-conquer technique 5 times.

Try some level 8 sudoku games

Unlike level 4 or above sudoku games, level 2 games do not need to perform the divide-and-conquer technique. They can be solved with simple logic reasoning. Yet, many of them are very challenging.

Try daily level 2 sudoku.