Object access

[ForTheReallys]

OK so I have a Game class which contains an array of pointers to a Player class which is declared within the Game class like so: Players **gamblers
Now, the size of this array is based on the constructor argument. However, the user is the one who inputs the argument like so:

int main()
{
    int number;
    cout << "Input a number: ";
    cin >> number;

    (Class Name) name(number);
} 

This means that the Game object has to by dynamically declared and cannot be initialized outside of the main function. This can be a problem. Whenever I want to access that particular object and it's member variables in other functions, I cannot because I can never know the arguments of the constructor. How would I be able to access the object and it's member variables and member functions within other functions? The only way I can think of doing this is by passing a reference or pointer to the object in the parameters of the function but that would tend to get tedious. Is there any other way of accomplishing this?

[ForTheReallys]

Alright so I've figured something out. I declared a global Game pointer and once the object is created, I pointed the global pointer to the object. (I know this is usually a problem but the object is created in main so I won't have to worry about it being accidentally deleted.) Then whenever I want to access that object inside another function, I simply use the pointer. Now I have one last question. Is this a bad thing? I've heard somewhere that global pointers are no good. Is this true? If so, why not and what would be my alternative?