function fillRandomSquares

function fillRandomSquares(level,rows,cols){

    var matrixForGame = matrix(rows, cols, false);




    // create matrix
    function matrix( rows, cols, defaultValue){

        var arr = [];

        // Creates all lines:
        for(var i=0; i < rows; i++){

            // Creates an empty line
            arr.push([]);

            // Adds cols to the empty line:
            arr[i].push( new Array(cols));

            for(var j=0; j < cols; j++){
                // Initializes:
                arr[i][j] = defaultValue;
            }
        }
    return arr;
    }
}