HoDoKu

HoDoKu is an excellent program for Sudoku addicts that can keep you hooked to the computer for hours.

You have 5 different difficulty levels to play and put you to the test: easy, medium, difficult, unfair, and extreme and thousands of random sudokus created by the program.

In addition, HoDoKu includes a tutorial to learn all secrets of Sudokus and clues and tips from experts to solve them.

HoDoKu is probably the best free sudoku game, so don't think it again, downnload it and rack your brains solving these puzzles.