Supriya and Sudoku

The worldwide Sudoku craze has invaded our house as well. Manisha has become addicted to them and now has to do one a day (she does one Evil a day from www.websudoku.com). It intrigued me for a while but I lost interest once I understood the logic of it. I tried to get Supriya interested some time ago but it was completely beyond her. But then a couple of months ago Manisha showed her a 4 by 4 puzzle and Supriya got it (it seems to be another of the many developmental issues - it's meaningless before they are ready and obvious once they are ready. Not much one can do about it!). Then we found many kid-sized puzzles here. So we printed them out and she was able to zip through them all, including the more difficult 4 by 4s. She talked through the logic and it was quite apparent that she understands the process well.