I have to agree with a much echoed sentiment here that this application is not up-to-par with the quality of the other PortableApps.com applications--multiple solutions and guessing at numbers isn't "hard" it's just annoying.
Is anyone aware of better alternatives? Maybe a different source we could point John toward in making it portable? I haven't tried many Windows applications for this, but they mostly seem to be not free and not portable.
A couple of excellent, free, and open-source projects I have found for other platforms, both written in JAVA, are:
Web-based: Sudoku Solver - http://sudoku.sourceforge.net/
J2ME Mobile Devices: 5ud0ku - http://www.getjar.com/products/4320
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Neither of which help in finding an alternative.
As has been said, if someone can find a solid open source Sudoku that can be made portable, I'll swap it in... all the complaints don't accomplish anything at all.
Sometimes, the impossible can become possible, if you're awesome!
Sorry, John. I was trying to avoid rehashing old complaints, since I realize you're not the author of this program. I was hoping to turn things a little more constructive, and that maybe someone had found something for Windows that you or I hadn't.
There is excellent open source out there, just unfortunately not for the right platform. I think maybe there's a conspiracy to keep it away from the public, led by the publishers of the little books by the grocery store check-out and in the 99-cent stores. They're afraid all the middle-aged women will spread it around faster than Elf Bowling or Neko the Cat and put them out of business.
...but, I do have a different idea: "Neko Portable"
... Simon Tatham's Portable Puzzle Collection, which includes Sudoku (called Solo), and many other great games.
Web site: http://www.chiark.greenend.org.uk/~sgtatham/puzzles/
Scroll down and download them all in puzzles.zip.