vanillaSudoku is a classical one-to-one implementation of the favourite game Sudoku, released under the GNU/GPL, and comes totally free. It is written in Java and makes use of of the Swing GUI toolkit for a flexible and platform independent realization. By this you can use it on any major operating-system platform.
Beneath that, vanillaSudoku has the capability for generating random Sudoku puzzles in different difficulty levels, as well as the support for inputting own Sudoku puzzles from magazines or newspapers and solving them automatically. A very special function is the generation of Sudoku collections, which you can export to a single PDF file and print afterwards.

The license of this software is Freeware, you can free download and free use this sudoku game software.