Does Extern Break Encapsulation

Question

I am new to C++ and I am creating a game. I have a class called main in which I declare

Game * game; //globally
int main() {
    game = new Game();
    game->show();
}

My class game initiates my game etc. Now in other classes (player, enemy, etc.), I access variables from the game such as player health using

#include<game.h>
extern Game * game;
func::func() {
    game->health->resetHealth();
}

Is this breaking encapsulation/ood paradigm? Is it bad practice? The thing is I can see any other way of doing it for a game.

Answer 1

Yes, extern breaks encapsulation. The main concept of encapsulation is data hiding and binding property and behavior of an object in a single entity. Making the variable extern would break the law.
In some more advance OOP language like java, there is no extern. And in Java, it always suggested making property/field private to restrict its access.