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I go through periods where I'll spend a good amount of time solving Sudoku puzzles. Right now is one of those times. I've gone through a number of books of Sudoku puzzles but for the first time about a week ago started doing Sudoku puzzles on websites. Found these 2 websites for free puzzles.
http://www.websudoku.com/?level=2
This one is in USA Today's puzzles section. You have to watching a 15 second ad first.
http://puzzles.usatoday.com/sudoku/
My wife's a sudoku addict, so she's downloaded a sudoku app onto her phone. I'm more of an Angry Birds man myself.
I made a windows app for generating (allows you to print/save) Sudoku puzzles, but I never completed the generating of single solution easy/medium/hard puzzles part of it, maybe I should try and finish the app some day.
I use an app called Sudoku Grab on my iPhone - it can generate puzzles, as well as scan and import any printed puzzles you might come across. I tend to enjoy sudoku up until the point that there are a number of boxes left that could interchangeably be any of a subset of numbers and I can no longer deduce which is which, so it becomes guess-and-check.
I play sudoku a lot on my laptop..the game comes with Ubuntu 10.04.
I can play the easy an medium levels easily, hard level takes about 30 minutes to 1 hour, the very hard level more than an hour.
It takes a lot of concentration....
Try Yotamarker.
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