Ohmtal Sudoku is a nice and easy to use implementation of the famous puzzle game.
For each difficult mode it has 20000 puzzles to solve which is more than 10000 hours puzzle fun. You play against a timer which can be hidden while solving a puzzle. It supports four modes: easy, medium, hard and ultra. For each mode statistics are generated with a minimum, maximum and average time. It's designed to also run on old hardware and runs on PC, Mac and Linux.
Get the demo and train a little bit. Then register Ohmtal Sudoku and
get more puzzles and all themes.
There is only one (shown above) default theme available in the
demo but it is full playable.