02-24-2006, 11:31 AM
I can't believe you haven't seen these before. The traditional 3x3 boxes don't apply - the row and column rules do, but the "boxes" are the coloured regions. I'm assuming the darkened lines are still there just because of the way that program's set up.
Here's a page you might want to check out: http://www.maa.org/editorial/mathgames/m...05_05.html
Here's a page you might want to check out: http://www.maa.org/editorial/mathgames/m...05_05.html
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