Refactored GameManager as SO

Assets/Prefabs/GameManager.prefab

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Assets/Prefabs/GameplayCanvas.prefab

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Assets/Prefabs/Player.prefab

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Assets/Scenes/LoadingScene.unity

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Assets/Scenes/MainMenu.unity

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Assets/Scripts/GameplayUI.cs

     [SerializeField]
     private Image m_KeyIndicator;
 
+    [SerializeField]
+    private GameManagerSO m_GameManager;
+
-        m_ExitButton.onClick.AddListener(GameManager.ExitGameplay);
+        m_ExitButton.onClick.AddListener(m_GameManager.ExitGameplay);
-        m_ExitButton.onClick.RemoveListener(GameManager.ExitGameplay);
+        m_ExitButton.onClick.RemoveListener(m_GameManager.ExitGameplay);
     }
 }

Assets/Scripts/Loading.cs

     [SerializeField]
     private GameObject m_PlayButton;
 
+    [SerializeField]
+    private GameManagerSO m_GameManager;
+
-        m_SceneHandle = Addressables.DownloadDependenciesAsync("Level_0" + GameManager.s_CurrentLevel);
+        m_SceneHandle = Addressables.DownloadDependenciesAsync("Level_0" + m_GameManager.s_CurrentLevel);
         m_SceneHandle.Completed += OnSceneLoaded;
     }
 
 
     public void GoToNextLevel()
     {
-        Addressables.LoadSceneAsync("Level_0" + GameManager.s_CurrentLevel, UnityEngine.SceneManagement.LoadSceneMode.Single, true);
+        Addressables.LoadSceneAsync("Level_0" + m_GameManager.s_CurrentLevel, UnityEngine.SceneManagement.LoadSceneMode.Single, true);
     }
 
     private void Update()

Assets/Scripts/PlayerController.cs

     [SerializeField]
     private LayerMask m_InputCollisionLayer;
 
+    [SerializeField]
+    private GameManagerSO m_GameManager;
+
     private bool m_HasKey = false;
 
     private Rigidbody m_Rigidbody;
             {
                 Debug.Log("Opened the door");
 
-                GameManager.LevelCompleted();
+                m_GameManager.LevelCompleted();
             }
         }
     }

Assets/Scripts/GameManagerMB.cs.meta

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Assets/ScriptableObjects.meta

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Assets/Scripts/GameManagerMB.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class GameManagerMB : MonoBehaviour
+{
+    [SerializeField]
+    private GameManagerSO m_GameManager;
+}

Assets/Scripts/GameManagerSO.cs

+using UnityEngine;
+using UnityEngine.AddressableAssets;
+
+[CreateAssetMenu()]
+public class GameManagerSO : ScriptableObject
+{
+    public int s_CurrentLevel = 0;
+
+    public int s_MaxAvailableLevel = 4;
+
+    public int s_ActiveHat;
+
+    public void ExitGame()
+    {
+        s_CurrentLevel = 0;
+    }
+
+    public void LoadNextLevel()
+    {
+        // We are going to be using the Addressables API to manage our scene loading and unloading, the equivalent way on the UnityEngine.SceneManagement API is:
+        // SceneManager.LoadSceneAsync("LoadingScene", LoadSceneMode.Single);
+
+        // Scene loaded in Single mode, the previously loaded scenes will be disposed by the Addressables.
+        Addressables.LoadSceneAsync("LoadingScene", UnityEngine.SceneManagement.LoadSceneMode.Single, true);
+    }
+
+    public void LevelCompleted()
+    {
+        s_CurrentLevel++;
+
+        // Just to make sure we don't try to go beyond the allowed number of levels.
+        s_CurrentLevel = s_CurrentLevel % s_MaxAvailableLevel;
+
+        LoadNextLevel();
+    }
+
+    public void ExitGameplay()
+    {
+        Addressables.LoadSceneAsync("MainMenu", UnityEngine.SceneManagement.LoadSceneMode.Single, true);
+    }
+}

Assets/ScriptableObjects/GameManager.asset

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Assets/Scripts/GameManager.cs

-using UnityEngine;
-using UnityEngine.AddressableAssets;
-
-public class GameManager : MonoBehaviour
-{
-    public static int s_CurrentLevel = 0;
-
-    public static int s_MaxAvailableLevel = 4;
-
-    public static int s_ActiveHat;
-
-    public void ExitGame()
-    {
-        s_CurrentLevel = 0;
-    }
-
-    public static void LoadNextLevel()
-    {
-        // We are going to be using the Addressables API to manage our scene loading and unloading, the equivalent way on the UnityEngine.SceneManagement API is:
-        // SceneManager.LoadSceneAsync("LoadingScene", LoadSceneMode.Single);
-
-        // Scene loaded in Single mode, the previously loaded scenes will be disposed by the Addressables.
-        Addressables.LoadSceneAsync("LoadingScene", UnityEngine.SceneManagement.LoadSceneMode.Single, true);
-    }
-
-    public static void LevelCompleted()
-    {
-        s_CurrentLevel++;
-
-        // Just to make sure we don't try to go beyond the allowed number of levels.
-        s_CurrentLevel = s_CurrentLevel % s_MaxAvailableLevel;
-
-        LoadNextLevel();
-    }
-
-    public static void ExitGameplay()
-    {
-        Addressables.LoadSceneAsync("MainMenu", UnityEngine.SceneManagement.LoadSceneMode.Single, true);
-    }
-}

Assets/Scripts/UISetup.cs

-using UnityEngine;
-using UnityEngine.UI;
-
-public class UISetup : MonoBehaviour
-{
-    [SerializeField]
-    private Button m_StartButton;
-
-    private void OnEnable()
-    {
-        m_StartButton.onClick.AddListener(GameManager.LoadNextLevel);
-    }
-
-    private void OnDisable()
-    {
-        m_StartButton.onClick.RemoveListener(GameManager.LoadNextLevel);
-    }
-}