I can put 5 numbers in one box along with the number already inside a box, and I have no idea when I'm correct. The advantage to this game being online is that it can have great things like checking correctness, counting used numbers, etc. I might as well buy a sudoku with an eraser and then it'll look nice. I could use an erasable pen or some other utensils. Take advantage of the internet and technology, and then this will be something people enjoy. It'll be something people greatly prefer over the pencil and paper version. You could change number font, color, size. There is no creativity here what so ever and almost makes me feel like you've stolen the idea from the original creator of sudoko. Even if they gave their rights to everyone, I feel like this game is a disgrace to the classic version. I think an online sudoku would actually be really cool, and with some creativity and unique ideas, a little effort can really make this something of quality. Something special and worth not only the time of the people who play it, but also the time spent on its creation. I'd recommend including all of my ideas and at least some other unique ones, if you ever wish to salvage this mess.