Okay, by default, the `Game` class for an XNA PC game has a public bool attribute called `IsMouseVisible`, which when set enables/disables the mouse being visible. I have another class called `Configs` which monitors specific keys being pressed. Now what I want to do is set it so that when I press a specific key, it will change the value of `IsMouseVisible`. This is where I get stuck because I don't know how to change the value from another class. 

I know that I could just create a bool value in the `Configs` class and make it so that when the key is pressed, the value will change, then make it so that when the main `Game` class updates, it sets the value for `IsMouseVisible` to the Configs class' value, but the thing is, I might want to create multiple different values (not just `IsMouseVisible`) that can be set in the main `Game` class from another class. 

And there's my question, how could I set something in the main `Game` class from another class?
(Without having to create multiple updates for each and every value I want to be accessible.)