It just doesn't feel taxing enough.
You look at a box, then put the numbers 1 through 9 into and see if any of those numbers meet the criteria. Saying that though, I suppose you could do the same with a crossword and a dictionary, only it might take about a year.
( mike woz ere 7442200 & 7696970 getter, Thu 6 Oct 2011, 2:12, archived)

Did you never try the one where it had a large X running through the centre.
You could only have 1-9 in the x, that was a bit different.
( Wildheart Baby. Drunken Mess In A Good Way, Thu 6 Oct 2011, 2:16, archived)