using System;

var statistic = new Statistic();
var heroes = new Game { Name = "Heroes" };
var doom = new Game { Name = "Doom" };

//subscribe to events
heroes.GameStarted += statistic.GameStarted;
doom.GameStarted += statistic.GameStarted;

doom.Start();
heroes.Start();
//statistic.LastGame is "Heroes"
//statistic.StartsCount is 2

Console.WriteLine("{0}", statistic.LastGame);
Console.WriteLine("{0}", statistic.StartsCount);

class Game {
    public string Name { get; init; }

    public delegate void GameHandler(string name);
    public event GameHandler GameStarted;

    public void Start() {
        GameStarted?.Invoke(Name);
    }
}

class Statistic {
    public int StartsCount { get; private set; }
    public string LastGame { get; private set; }

    public void GameStarted(string name) {
        StartsCount++;
        LastGame = name;
    }
}