Scene creation and management in Unity - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Unity C# code when loading a scene?

Consider the following Unity C# script snippet that loads a scene asynchronously:

using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneLoader : MonoBehaviour {
    void Start() {
        SceneManager.LoadSceneAsync("Level2");
        Debug.Log("Scene loading started");
    }
}

What will be printed in the Unity Console when this script runs?

Unity

using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneLoader : MonoBehaviour {
    void Start() {
        SceneManager.LoadSceneAsync("Level2");
        Debug.Log("Scene loading started");
    }
}

A No output because LoadSceneAsync is asynchronous

B Scene loading started\nLevel2 scene loaded

C Scene loading started

D Error: Scene 'Level2' not found

💡 Hint

Remember that LoadSceneAsync starts loading but does not block the thread.

The Debug.Log runs immediately after starting the asynchronous load, so only "Scene loading started" is printed at that moment. The actual scene load completes later without automatic logging.

🧠 Conceptual

intermediate

Which Unity method is used to add a scene to the current scenes without unloading others?

In Unity, you want to load a new scene but keep the current scene active and loaded. Which method should you use?

A SceneManager.LoadScene("NewScene", LoadSceneMode.Additive)

B SceneManager.LoadScene("NewScene")

C SceneManager.UnloadSceneAsync("CurrentScene")

D SceneManager.LoadSceneAsync("NewScene", LoadSceneMode.Single)

💡 Hint

Think about how to keep multiple scenes loaded at once.

Using LoadScene with LoadSceneMode.Additive loads the new scene without unloading the current one, allowing multiple scenes to be active simultaneously.

🔧 Debug

advanced

Why does this Unity code fail to unload a scene?

Examine the following code snippet:

using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneUnloader : MonoBehaviour {
    void Start() {
        SceneManager.UnloadSceneAsync("Level1");
        Debug.Log("Unload requested");
    }
}

After running, the scene "Level1" remains loaded. What is the most likely reason?

Unity

using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneUnloader : MonoBehaviour {
    void Start() {
        SceneManager.UnloadSceneAsync("Level1");
        Debug.Log("Unload requested");
    }
}

A UnloadSceneAsync requires a scene index, not a name

B UnloadSceneAsync only works in the editor, not in builds

C UnloadSceneAsync is synchronous and blocks until unload completes

D The scene "Level1" is the active scene and cannot be unloaded until another scene is active

💡 Hint

Think about Unity's rules for unloading active scenes.

Unity does not allow unloading the active scene. You must first set another scene as active before unloading the current active scene.

📝 Syntax

advanced

Which code snippet correctly loads a scene and executes code after loading completes?

You want to load a scene asynchronously and then print "Scene loaded" only after the scene finishes loading. Which code snippet is correct?

A

SceneManager.LoadScene("Level3");
Debug.Log("Scene loaded");

B

var asyncOp = SceneManager.LoadSceneAsync("Level3");
asyncOp.completed += (op) => Debug.Log("Scene loaded");

C

SceneManager.LoadSceneAsync("Level3");
Debug.Log("Scene loaded");

D

var asyncOp = SceneManager.LoadSceneAsync("Level3");
asyncOp.isDone = true;
Debug.Log("Scene loaded");

💡 Hint

Look for how to detect completion of asynchronous loading.

Option B attaches a callback to the async operation's completed event, ensuring the log runs after loading finishes. Other options either log immediately or misuse properties.

🚀 Application

expert

How many scenes are loaded after this code runs?

Given the following Unity C# code executed in a project with three scenes: "MainMenu", "Level1", and "Level2". Initially, only "MainMenu" is loaded and active.

using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneTest : MonoBehaviour {
    void Start() {
        SceneManager.LoadScene("Level1", LoadSceneMode.Additive);
        SceneManager.LoadSceneAsync("Level2", LoadSceneMode.Additive);
        SceneManager.UnloadSceneAsync("MainMenu");
    }
}

After all operations complete, how many scenes remain loaded?

Unity

using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneTest : MonoBehaviour {
    void Start() {
        SceneManager.LoadScene("Level1", LoadSceneMode.Additive);
        SceneManager.LoadSceneAsync("Level2", LoadSceneMode.Additive);
        SceneManager.UnloadSceneAsync("MainMenu");
    }
}

A 3 scenes: MainMenu, Level1, and Level2

B 2 scenes: Level1 and Level2

C 1 scene: Level2 only

D 2 scenes: MainMenu and Level1

💡 Hint

Consider the effect of additive loading and unloading asynchronously.

Initially MainMenu is loaded and active. Level1 loads additively synchronously, adding it. Level2 loads additively asynchronously. UnloadSceneAsync is called on MainMenu, but since it remains the active scene, it cannot be unloaded. After all operations complete, all three scenes remain loaded.