Scene loading and unloading in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to load a scene named "GameScene" using Unity's SceneManager.

Unity

SceneManager.[1]("GameScene");

Drag options to blanks, or click blank then click option'

AUnloadSceneAsync

BLoadScene

CLoadSceneAsyncAdditive

DGetActiveScene

Attempts:

3 left

💡 Hint

Common Mistakes

Using UnloadSceneAsync instead of LoadScene.

Confusing synchronous and asynchronous loading methods.

The LoadScene method loads a scene synchronously by its name.

2fill in blank

medium

Complete the code to unload a scene named "MenuScene" asynchronously.

Unity

SceneManager.[1]("MenuScene");

Drag options to blanks, or click blank then click option'

ALoadScene

BGetSceneByName

CUnloadSceneAsync

DLoadSceneAsync

Attempts:

3 left

💡 Hint

Common Mistakes

Using LoadScene instead of unloading.

Using synchronous unload methods which don't exist.

The UnloadSceneAsync method unloads a scene asynchronously by its name.

3fill in blank

hard

Fix the error in the code to load a scene additively named "Level2".

Unity

SceneManager.LoadScene("Level2", [1].Additive);

Drag options to blanks, or click blank then click option'

ALoadSceneMode

BSceneLoadMode

CSceneManagerMode

DLoadMode

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect enum names like SceneLoadMode.

Forgetting to specify additive mode.

The LoadSceneMode enum specifies how to load the scene, and Additive loads it without unloading current scenes.

4fill in blank

hard

Fill both blanks to load a scene named "BonusLevel" asynchronously and additively.

Unity

SceneManager.[1]("BonusLevel", [2].Additive);

Drag options to blanks, or click blank then click option'

ALoadSceneAsync

BLoadScene

CLoadSceneMode

DUnloadSceneAsync

Attempts:

3 left

💡 Hint

Common Mistakes

Using synchronous LoadScene instead of LoadSceneAsync.

Using wrong enum like UnloadSceneAsync.

LoadSceneAsync loads the scene asynchronously, and LoadSceneMode.Additive loads it additively without unloading other scenes.

5fill in blank

hard

Fill all three blanks to unload a scene named "OldScene" asynchronously and check if unloading is done.

Unity

AsyncOperation asyncOp = SceneManager.[1]("OldScene");
if (asyncOp.[2])
{
    Debug.Log("Scene unloaded successfully.");
}
else
{
    Debug.Log("Scene is still unloading.");
}
asyncOp.[3] += () => Debug.Log("Unload completed event triggered.");

Drag options to blanks, or click blank then click option'

AUnloadSceneAsync

BisDone

Ccompleted

DLoadSceneAsync

Attempts:

3 left

💡 Hint

Common Mistakes

Using LoadSceneAsync instead of UnloadSceneAsync.

Checking wrong property instead of isDone.

Not subscribing to the completed event properly.

UnloadSceneAsync starts unloading the scene asynchronously. isDone checks if the operation finished. completed is an event triggered when unloading finishes.

Practice

1. What does loading a scene in Unity do?

easy

A. It changes what the player sees by switching or adding scenes.

B. It deletes all game objects permanently.

C. It saves the current game progress automatically.

D. It pauses the game without changing the view.

Solution

1. Step 1: Understand scene loading purpose

   Loading a scene changes the visible content by switching or adding new scenes.

2. Step 2: Compare other options

   Deleting objects, saving progress, or pausing are unrelated to scene loading.

3. Final Answer:

   It changes what the player sees by switching or adding scenes. -> Option A

4. Quick Check:

   Scene loading = change visible scenes [OK]

Hint: Loading scenes changes what player sees [OK]

Common Mistakes:

• Confusing loading with saving game progress
• Thinking loading deletes objects
• Assuming loading pauses the game

2. Which of the following is the correct syntax to load a scene additively in Unity using C#?

easy

A. SceneManager.LoadScene("Level2", LoadSceneMode.Additive);

B. SceneManager.LoadSceneAdditive("Level2");

C. SceneManager.LoadScene("Level2", true);

D. SceneManager.AddScene("Level2");

Solution

1. Step 1: Recall Unity scene loading syntax

   The correct method is LoadScene with scene name and LoadSceneMode.Additive as parameters.

2. Step 2: Check each option

   Only SceneManager.LoadScene("Level2", LoadSceneMode.Additive); uses the correct method and enum for additive loading.

3. Final Answer:

   SceneManager.LoadScene("Level2", LoadSceneMode.Additive); -> Option A

4. Quick Check:

   LoadScene + LoadSceneMode.Additive = correct syntax [OK]

Hint: Use LoadScene with LoadSceneMode.Additive [OK]

Common Mistakes:

• Using non-existent methods like LoadSceneAdditive
• Passing boolean instead of LoadSceneMode enum
• Confusing AddScene with LoadScene

3. What will happen if you run this code snippet in Unity?

SceneManager.LoadScene("Menu");
SceneManager.LoadScene("Game", LoadSceneMode.Additive);

medium

A. Only the "Game" scene will be loaded, replacing "Menu".

B. Only the "Menu" scene will be loaded, ignoring the second call.

C. Both "Menu" and "Game" scenes will be loaded together.

D. An error will occur because you cannot load two scenes in a row.

Solution

1. Step 1: Understand default and additive loading

   The first call loads "Menu" scene normally (single mode), replacing current scenes. The second call loads "Game" additively, adding it without unloading "Menu".

2. Step 2: Analyze the sequence

   Since the second call uses additive mode, both scenes "Menu" and "Game" will be loaded together.

3. Final Answer:

   Both "Menu" and "Game" scenes will be loaded together. -> Option C

4. Quick Check:

   Additive loading adds scene without unloading [OK]

Hint: Additive mode loads scene without unloading others [OK]

Common Mistakes:

• Assuming first load is replaced by second always
• Thinking additive unloads previous scenes
• Believing multiple loads cause errors

4. Identify the error in this Unity C# code for unloading a scene:

SceneManager.UnloadScene("Level1");

medium

A. UnloadScene is deprecated; use UnloadSceneAsync with scene name.

B. UnloadSceneAsync should be used instead of UnloadScene.

C. There is no error; the code unloads the scene correctly.

D. UnloadScene requires a Scene object, not a string.

Solution

1. Step 1: Check Unity API for unloading scenes

   SceneManager.UnloadScene requires a Scene object as parameter, not a string name. No overload accepts string directly.

2. Step 2: Analyze the code

   The code will not compile. Correct usage: Scene scene = SceneManager.GetSceneByName("Level1"); SceneManager.UnloadScene(scene);

3. Final Answer:

   UnloadScene requires a Scene object, not a string. -> Option D

4. Quick Check:

   UnloadScene(Scene), not (string) [OK]

Hint: UnloadScene requires Scene object, not string [OK]

Common Mistakes:

• Passing string name instead of Scene object
• Thinking UnloadScene is deprecated
• Assuming the code runs without error

5. You want to load a new scene "Battle" without unloading the current "Town" scene, but only if "Battle" is not already loaded. Which code snippet correctly does this in Unity?

hard

A. SceneManager.UnloadSceneAsync("Town");
SceneManager.LoadScene("Battle");

B. if (!SceneManager.GetSceneByName("Battle").isLoaded) {
SceneManager.LoadScene("Battle", LoadSceneMode.Additive);
}

C. SceneManager.LoadScene("Battle", LoadSceneMode.Single);

D. SceneManager.LoadScene("Battle");

Solution

1. Step 1: Check if "Battle" scene is already loaded

   Use SceneManager.GetSceneByName("Battle").isLoaded to verify if scene is loaded.

2. Step 2: Load "Battle" additively if not loaded

   If not loaded, call LoadScene with LoadSceneMode.Additive to keep "Town" scene loaded.

3. Final Answer:

   if (!SceneManager.GetSceneByName("Battle").isLoaded) { SceneManager.LoadScene("Battle", LoadSceneMode.Additive); } -> Option B

4. Quick Check:

   Check loaded + additive load = correct approach [OK]

Hint: Check isLoaded before additive load [OK]

Common Mistakes:

• Loading scene in single mode, unloading current scene
• Not checking if scene is already loaded
• Unloading current scene before loading new one