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Usually, you try to avoid global objects. If you need to use a player object in some method, pass it by reference to the method. For example

class Player {
  public void someMethod() {}
}

class Controller {
  public void usePlayer(Player p) {
    p.someMethod();
  }
}

class Game {
  static int Main(string[] args) {
    Player p1 = new Player();
    Controller c = new Controller();

    while (gameRuns) {
      if (someCondition) {
        c.usePlayer(p1);
      }
    }

    return 0;
  }
}