Here you can play random-generated Sudoku puzzles, organized based on 4 difficulty levels: easy, medium, hard, and very hard.
These Sudoku puzzles can be played online, directly from the browser.
The puzzles are available in 4 different languages: English, French, German and Romanian.
The Sudoku puzzles are provided by Goobix.com.
You can find more information about Sudoku puzzles here.