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there is no real satistics to a sudoku so unluky the are many ways to do a sudoku
It doesn't look as if Euler was involved with the invention of Sudoku. http://en.wikipedia.org/wiki/Sudoku#History
No, you can do Sudoku with letters or shapes sometimes. You don't actually have to add or subtract or do math calculations when playing it.
There are 9 rows and 9 columns. There is 81 individual squares in one grid.
Sudoku