Why Build settings and scene order in Unity? - Purpose & Use Cases

The Big Idea

What if your game skipped levels or crashed because scenes weren't in the right order?

The Scenario

Imagine you have a game with many levels, and you want to test each one by opening its file manually every time.

You have to remember which level comes next and open scenes one by one.

The Problem

This manual way is slow and confusing.

You might open the wrong scene or forget to include a level when making the final game.

It's easy to make mistakes and waste time.

The Solution

Using build settings and scene order lets you list all your game scenes in the right sequence.

Unity then knows which scenes to include and in what order to load them automatically.

Before vs After

✗ Before

Open each scene file manually to test levels.

✓ After

Add scenes to build settings and set their order for automatic loading.

What It Enables

You can create smooth game flow and build your game with all scenes included correctly.

Real Life Example

When making a platformer game, you add all levels to build settings in order so the player moves from level 1 to 2 to 3 without errors.

Key Takeaways

Manually opening scenes is slow and error-prone.

Build settings let you organize scenes in the right order.

This ensures your game runs smoothly and all scenes are included in the final build.

Practice

1. What does the Build Settings window in Unity control?

easy

A. Which scenes are included in the final game build

B. The resolution of the game window

C. The color scheme of the editor

D. The physics settings of the game

Solution

1. Step 1: Understand the purpose of Build Settings

   The Build Settings window lists scenes to include in the game build and their order.

2. Step 2: Identify what Build Settings controls

   It controls which scenes are packaged into the final game, not editor or physics settings.

3. Final Answer:

   Which scenes are included in the final game build -> Option A

4. Quick Check:

   Build Settings = Scenes included [OK]

Hint: Build Settings = scenes included in game build [OK]

Common Mistakes:

• Confusing Build Settings with editor appearance
• Thinking it controls physics or resolution
• Assuming it sets scene start order only

2. Which of the following is the correct way to add a scene to the build in Unity?

easy

A. Drag the scene file into the Build Settings window's Scenes In Build list

B. Right-click the scene in Project and select 'Add to Build'

C. Open the scene and press Ctrl+B

D. Rename the scene file to include 'build' in its name

Solution

1. Step 1: Recall how to add scenes to build

   In Unity, you add scenes by dragging them into the Scenes In Build list in Build Settings.

2. Step 2: Evaluate the options

   Only dragging the scene file into Build Settings is correct; other options are invalid or do nothing.

3. Final Answer:

   Drag the scene file into the Build Settings window's Scenes In Build list -> Option A

4. Quick Check:

   Add scene = drag to Build Settings [OK]

Hint: Add scenes by dragging into Build Settings list [OK]

Common Mistakes:

• Trying to add scenes by renaming files
• Using keyboard shortcuts that don't add scenes
• Expecting context menu to add scenes automatically

3. Given the following scenes in Build Settings in order: ["Menu", "Level1", "Level2"], what will SceneManager.LoadScene(1) load?

medium

A. The scene named "Menu"

B. The scene named "Level1"

C. The scene named "Level2"

D. An error because index 1 is invalid

Solution

1. Step 1: Understand scene indexing in Build Settings

   Scenes are indexed starting at 0 in the order listed in Build Settings.

2. Step 2: Identify scene at index 1

   Index 0 = "Menu", index 1 = "Level1", index 2 = "Level2".

3. Final Answer:

   The scene named "Level1" -> Option B

4. Quick Check:

   Index 1 = second scene = Level1 [OK]

Hint: Scene index starts at 0 in Build Settings [OK]

Common Mistakes:

• Assuming index 1 is the first scene
• Confusing scene names with indexes
• Thinking index 1 causes an error

4. You try to load a scene by index using SceneManager.LoadScene(3), but get an error. What is the most likely cause?

medium

A. SceneManager.LoadScene only accepts strings

B. You must use scene names, not indexes

C. The scene file is missing from the Project folder

D. The scene at index 3 is not added to Build Settings

Solution

1. Step 1: Understand scene indexing and Build Settings

   Scene indexes correspond to the order in Build Settings; index 3 means the fourth scene.

2. Step 2: Identify cause of error

   If index 3 is out of range, it means fewer than 4 scenes are added to Build Settings.

3. Final Answer:

   The scene at index 3 is not added to Build Settings -> Option D

4. Quick Check:

   Index out of range = scene missing in Build Settings [OK]

Hint: Check Build Settings scene count before loading by index [OK]

Common Mistakes:

• Thinking indexes are unrelated to Build Settings
• Believing LoadScene only accepts names
• Assuming missing file causes this specific error

5. You want your game to start with the "Intro" scene, but currently the "MainMenu" scene is first in Build Settings. How can you fix this without renaming scenes?

hard

A. Call SceneManager.LoadScene("Intro") in the first scene's script

B. Change the scene file name to "00_Intro"

C. Drag the "Intro" scene to the top of the Scenes In Build list

D. Remove "MainMenu" from Build Settings

Solution

1. Step 1: Understand scene start order in Build Settings

   The first scene in the Scenes In Build list is the one that starts when the game runs.

2. Step 2: Adjust scene order without renaming

   Drag the "Intro" scene to the top of the list to make it the first scene loaded.

3. Final Answer:

   Drag the "Intro" scene to the top of the Scenes In Build list -> Option C

4. Quick Check:

   First scene in Build Settings = start scene [OK]

Hint: First scene in Build Settings list starts game [OK]

Common Mistakes:

• Renaming files instead of reordering scenes
• Removing scenes unnecessarily
• Relying only on script calls without build order