How do you declare dynamic multidimensional array's?

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I need a dynamic multidimensional array, but I get compile time errors trying to declare it.
These don't work for sure.
Square *test = new Square[number_of_rows][number_of_collumns];
Square test[][] = new Square[number_of_rows][number_of_collumns];
Square (*test)[][] = new Square[number_of_rows][number_of_collumns];

if I declare it single diminsional, and try to use it double dimensional, that doesn't work either. I know I could convert manually, but I am doing a lot of stuff and I want the code to be as readable as possible. Thanks