The most addicted SuDoKu users will find SuDoKu Cracker very interesting. It lets you generate and play games of SuDoKu puzzles of up to seven different difficulty levels.
SuDoKu Cracker lets you generate an infinite variety of SuDoKus, so you`ll never be bored, as they never repeat. It is also totally free. SuDoKu Cracker even comes integrated with its own SuDoKu editor so you can design your own.
The SuDoKus you create with SuDoKu Cracker can be exported to both HTML and RTF; you can also print them out and solve them on paper.