SuDokuMate is NOT a solver. It is NOT a grid generator. Listed below are a number of books on SuDoku (aka Su Doku) with a number of graded puzzles;
some also give solving tips and a great insight into the puzzle and it's history.
Please read the descriptions and customer reviews for more information.
Following these links you will get the Amazon's fantastic discounts and help support the SuDokuMate project at sudokumate.com.