Exemple

using System;
using UnityEngine;
using UnityEngine.UI;

public enum GameColor
{
    Red,
    Green,
    Blue
}

public class Singleton<T>: MonoBehaviour
{
    private static T instance;
    public static T Instance
    {
        get
        {
            if (instance == null)
            {
                instance = (T)(object)FindObjectOfType(typeof(T));
            }
            return instance;
        }
    }
}

public class GameManager : Singleton<GameManager>
{
    [SerializeField] public GameColor Color;

    public void OnLost()
    {
        Debug.Log("You lost!");
    }

    public void OnWin()
    {
        Debug.Log("You win!");
    }

    public event Action OnLostEvent;
    public event Action OnWinEvent;

    private void OnEnable()
    {
        OnLostEvent += OnLost;
        OnWinEvent += OnWin;
    }

    private void OnDisable()
    {
        OnLostEvent -= OnLost;
        OnWinEvent -= OnWin;
    }

    private bool CheckIsWin(GameColor color)
    {
        return Color == color;
    }

    public void onClickCheckIsWin(GameColor color)
    {
        if (CheckIsWin(color))
        {
            OnWinEvent?.Invoke();
            return;
        }
        OnLostEvent?.Invoke();
    }
}

public class ButtonColor : MonoBehaviour
{
    [SerializeField] GameColor color;
    [HideInInspector] [SerializeField] Button Button;

    private void Reset()
    =>
        this.Button = GetComponent<Button>();

    private void OnEnable()
    =>
       this.Button.onClick.AddListener(() => GameManager.Instance.onClickCheckIsWin(this.color));


    private void OnDisable()
    =>
        this.Button.onClick.RemoveListener(() => GameManager.Instance.onClickCheckIsWin(this.color));
}