Desktop Sudoku 5 2

Desktop Sudoku is a great puzzle game that allows you to play three different puzzles: Sudoku, Killer Sudoku and Sudoku X. Each puzzle can be played in a different difficulty level. They are 4 levels of difficulty, from novice to Sudoku veteran. Desktop Sudoku has unlimited puzzles. You can print out puzzles easily, and solve them on paper. It is easy to play, no messy rubbing out if you make a mistake. 
System requirements: CPU 120 Mhz, 16MB RAM, Windows 98/ME/2000/XP, 1MB Hard drive space, an Internet connection. 
Desktop Sudoku is a free to try software. You can free download and try it for an evaluation period.