Programming-Design-Patterns-And-Principles/Assets/Patterns_And_Principles/Patterns/The Singleton Pattern/MonoSingleton/Script/TestGameManager.cs

using UnityEngine;
using Patterns_And_Principles.Patterns.The_Singleton_Pattern.MonoSingleton.Script;

public class TestGameManager : MonoSingleton<TestGameManager>
{
    public int Coin;

    public void AddCoin(int amount)
    {
        Coin += amount;
    }
}