So I just got sucked into that Killer Sudoku puzzle - and ugh, now I have a burning desire to print it out on a big A2 spread to work on it. After the first co

So I just got sucked into that Killer Sudoku puzzle - and ugh, now I have a burning desire to print it out on a big A2 spread to work on it. After the first couple of "gimme" squares, the interface is completely worthless for tracking the information you actually need to remember. There's no good way to express "This square is three more than that square, and also can only be one of these possibilities", which makes it a pain to correlate that with similar information about other squares, but at the same time (at least at this, admittedly early stage) it still feels like you can always make another logical step to another piece of information. I don't even want to look at the others until I've either finished or given up on this one.