I have never solved a Sudoku puzzle. I've only tried to do it a few times, but it takes a great deal of concentration and trial and error, so it might make some people get frustrated after a while. Just when you think you may have completed a few columns in the grid correctly, you realize that you didn't, so you have to go back and see which numbers you need to rearrange.
I'll attempt to do another one of these puzzles sometime in the future, but I know that I will most likely only end up being frustrated again. If I ever solve one of them completely, I would be very surprised.
