A magical square is simple. You draw a square and divide it surface in 9 equal smaller squares (in other words, you have a table of 3 lines and 3 columns).
Now, the rule is that you have to put the numbers 1 to 9 in each little square. And you can put of course each number only once (like in a sudoku a bit). Now the sum in line or column or in the 2 main diagonal of the table should be always equal to 15.
Check those links for more information (warning, spoiler inside)
en.wikipedia.org/wiki/Magic_squaremathworld.wolfram.com/MagicSquare.html
Jean-Christophe
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