Game Development Series Part 2: Choosing a Game Engine

What is a Game Engine?

A game engine is a software framework that provides the foundational systems needed to create games. Instead of building everything from scratch—rendering, physics, audio, input handling—you get pre-built, tested components that work together.

What Engines Provide

Why Use a Game Engine?

• Focus on Your Game: Spend time on gameplay, not infrastructure
• Proven Technology: Battle-tested by thousands of shipped games
• Cross-Platform: Deploy to PC, console, mobile from one codebase
• Community & Resources: Tutorials, assets, plugins, forums
• Industry Standard: Skills transfer to jobs at game studios

Unity

Unity is the world's most popular game engine, powering over 50% of all mobile games and a significant portion of indie and AA titles. It's known for its accessibility, flexibility, and massive ecosystem.

Unity at a Glance

Unity's Architecture

// Unity uses a Component-based system
// GameObjects are containers; Components define behavior

public class PlayerController : MonoBehaviour
{
    public float speed = 5f;
    
    void Update()  // Called every frame
    {
        float horizontal = Input.GetAxis("Horizontal");
        float vertical = Input.GetAxis("Vertical");
        
        Vector3 movement = new Vector3(horizontal, 0, vertical);
        transform.Translate(movement * speed * Time.deltaTime);
    }
}

Unity Pros & Cons

Unreal Engine

Unreal Engine is the industry standard for AAA games, known for stunning graphics, powerful tools, and professional-grade features. Epic Games uses it for Fortnite and licenses it to studios worldwide.

Unreal at a Glance

Unreal's Blueprint System

Unreal's Blueprints let you create game logic visually without coding:

┌─────────────────────────────────────────────────────────────┐
│                     BLUEPRINT EXAMPLE                       │
├─────────────────────────────────────────────────────────────┤
│                                                             │
│  [Event Tick] ──► [Get Player Input] ──► [Add Movement]    │
│                           │                     │           │
│                           ▼                     ▼           │
│                    [Horizontal]          [Move Forward]     │
│                    [Vertical]            [at Speed 500]     │
│                                                             │
└─────────────────────────────────────────────────────────────┘

Unreal Pros & Cons

Godot

Godot is a free, open-source engine that has surged in popularity. It's lightweight, beginner-friendly, and has no licensing fees or royalties—ever.

Godot at a Glance

GDScript Example

# Godot uses a node-based scene system
# GDScript feels like Python

extends CharacterBody2D

var speed = 300.0

func _physics_process(delta):
    var direction = Input.get_vector("left", "right", "up", "down")
    velocity = direction * speed
    move_and_slide()
    
    if direction != Vector2.ZERO:
        $AnimatedSprite2D.play("walk")
    else:
        $AnimatedSprite2D.play("idle")

Godot Pros & Cons

Other Engines Worth Knowing

How to Choose the Right Engine

Decision Framework

What kind of game are you making?
│
├─► 2D Game
│   ├─► Simple/First Project ──► Godot or GameMaker
│   ├─► Mobile Focus ──────────► Unity
│   └─► Pixel Art/Retro ───────► Godot or GameMaker
│
├─► 3D Game
│   ├─► Realistic Graphics ────► Unreal Engine
│   ├─► Stylized/Mobile 3D ────► Unity
│   └─► Learning 3D basics ────► Godot 4
│
├─► VR/AR
│   └─► Unity or Unreal (both strong)
│
└─► Web Game
    └─► Phaser, Godot, or Unity WebGL

Comparison Matrix

Recommendations by Experience Level