Added User Manual and fixes

Added help button on the title screen with animation. Added User Manual to appear after clicking the button, and vice versa. Added tons of catches to handle unwanted errors.

Assets/Scripts/Game/CreatePlayerJoinCards.cs

@@ -21,8 +21,15 @@ namespace Game
 
         public PlayerJoinCard CreateCard() // Creates a player join card
         {
-            GameObject card = Instantiate(playerJoinCardPrefab, transform);
-            return card.GetComponent<PlayerJoinCard>();
+            try
+            {
+                GameObject card = Instantiate(playerJoinCardPrefab, transform);
+                return card.GetComponent<PlayerJoinCard>();
+            }
+            catch
+            {
+                return null;
+            }
         }
     }
 }

Assets/Scripts/Game/GameManager.cs

@@ -68,7 +68,10 @@ public class GameManager : MonoBehaviour
     /// </summary>
     private void Start()
     {
-        MusicManager.Instance.StartPlaylist();
+        if (MusicManager.Instance != null)
+        {
+            MusicManager.Instance.StartPlaylist();
+        }
         StartGame();
     }
 
@@ -124,8 +127,11 @@ public class GameManager : MonoBehaviour
         }
         if (gameMode == GameMode.keepAway)
         {
-            gameTimer.startTime = time;
-            gameTimer.StartTimer();
+            if (gameTimer != null)
+            {
+                gameTimer.startTime = time;
+                gameTimer.StartTimer();
+            }
             foreach (GameObject player in players)
             {
                 player.transform.position = spawnPosition + (offset * players.IndexOf(player) * Vector2.right);
@@ -203,11 +209,17 @@ public class GameManager : MonoBehaviour
     /// </summary>
     public void GameOver()
     {
+        if (LeaderboardCanvas == null){}
         gameOver = true;
         EndGameEvent?.Invoke();
-        LeaderboardCanvas.gameObject.SetActive(false);
-        TimerCanvas.gameObject.SetActive(false);
-
+        if (LeaderboardCanvas != null)
+        {
+            LeaderboardCanvas.gameObject.SetActive(false);
+        }
+        if (TimerCanvas != null)
+        {
+            TimerCanvas.gameObject.SetActive(false);
+        }
         if (gameMode == GameMode.freeForAll)
         {
             GameObject winner = AlivePlayers()[0];
@@ -231,13 +243,24 @@ public class GameManager : MonoBehaviour
             if (winner != null)
             {
                 print(winner.name + " is the winner with " + maxHoldTime + " seconds!");
-                FindFirstObjectByType<PlayerCameraMovement>().WinScene(winner);
+                var cameraMovement = FindFirstObjectByType<PlayerCameraMovement>();
+                if (cameraMovement != null)
+                {
+                    cameraMovement.WinScene(winner);
+                }
                 WinScreen.Instance.ShowWinScreen(players.IndexOf(winner) + 1);
-                FindFirstObjectByType<LifeDisplayManager>().HideLifeDisplay();
+                var lifeDisplayManager = FindFirstObjectByType<LifeDisplayManager>();
+                if (lifeDisplayManager != null)
+                {
+                    lifeDisplayManager.HideLifeDisplay();
+                }
                 StartCoroutine(MoveHatToWinner(winner));
-                hatObject.SetActive(true);
-                hatObject.GetComponent<Collider2D>().enabled = true;
-                hatObject.GetComponent<Rigidbody2D>().bodyType = RigidbodyType2D.Dynamic;
+                if (hatObject != null)
+                {
+                    hatObject.SetActive(true);
+                    hatObject.GetComponent<Collider2D>().enabled = true;
+                    hatObject.GetComponent<Rigidbody2D>().bodyType = RigidbodyType2D.Dynamic;
+                }
             }
         }
         if (gameMode == GameMode.obstacleCourse)

Assets/Scripts/Game/UserManualPopup.cs

@@ -0,0 +1,18 @@
+using UnityEngine;
+
+public class UserManualPopup : MonoBehaviour
+{
+    public GameObject popupPanel;
+
+    public void ShowPopup()
+    {
+        popupPanel.SetActive(true);
+        gameObject.SetActive(true);
+    }
+
+    public void HidePopup()
+    {
+        popupPanel.SetActive(false);
+        gameObject.SetActive(false);
+    }
+}

Assets/Scripts/Game/UserManualPopup.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 3f3390a791c72be41ab00266e23fe518

Assets/Scripts/Player/PlayerManager.cs

@@ -32,11 +32,23 @@ public class PlayerManager : MonoBehaviour
             Destroy(playerInput.gameObject);
             return;
         }
-        Debug.Log("Player joined");
+        print("Player joined");
         DontDestroyOnLoad(playerInput.gameObject);
+        if (PlayerCardCreator.Instance == null)
+        {
+            return;
+        }
         PlayerJoinCard card = PlayerCardCreator.Instance.CreateCard();
+        if (card == null)
+        {
+            return;
+        }
         card.playerNumber = GameManager.players.Count + 1;
         cards.Add(card);
+        if (GameManager.players == null)
+        {
+            GameManager.players = new List<GameObject>();
+        }
         GameManager.players.Add(playerInput.gameObject);
         Colorize(GameManager.players.Count - 1);
     }
@@ -46,7 +58,7 @@ public class PlayerManager : MonoBehaviour
     {
         Destroy(playerInput.gameObject);
         GameManager.players.Remove(playerInput.gameObject);
-        Debug.Log("Player left");
+        print("Player left");
     }
 
     private void Init()