Singleton Pattern In Unity

A singleton is a class that allows only one instance of itself to exist. Any script can access it from anywhere without needing a reference.

• Only one instance exists in the game
• Accessible from any script using ClassName.Instance
• Persists across scenes (optional)

Basic Singleton Implementation

This is the simplest singleton pattern.

Now any script can call GameManager.Instance.StartGame() without finding or dragging references.

Complete Singleton (No Duplicates)

This version prevents duplicate instances from being created.

If a second AudioManager tries to spawn, it destroys itself. The first one remains.

Using Singleton from Any Script

Once you have a singleton, any script can access it directly. This is the main benefit - no dragging references in Inspector.

No need to drag references. Just call ClassName.Instance.MethodName() from anywhere.

Singleton vs Static Class

When to Use Singleton

• Good for: GameManager, AudioManager, ScoreManager, UIManager, SaveSystem.
• Not Good For: Player (if multiple players), Enemies, Bullets, Items.