Instance of a class

Hi, Yesterday I was going through some code where I found this line: Cell[, ] Cells = null; I´ve never seen this way of making an instance from class before and thought mabey anyone here could explain what it does. The thing I dont understand is the "[, ]"-part in "Cell[, ]". The code I was going through is found at: http://www.c-sharpcorner.com/Code/2002/Sept/dfsmaze.asp (It´s in the zip file that follows, Maze.cs) I will highly appreciate any response given. Thanks.