I have a hand-held sudoku thing so I practice when I'm bored. Supposedly it helps to raise your IQ.
I don't know much about hacking so I don't know if they can be corrupted or not. XD The only thing I know is that you can right click to rewind and stuff, but that's it.
If Firn did decide to use this, I'd want to fix it up quite a bit first. This was mostly just an experiment. I start a lot of projects like this and don't finish them. I'm glad I finished this to the point where it's playable, but there's a lot of things I want to do to make it better.