Build 3D Games With AI: Vibe Coding Guide for Beginners`

“Can I make games without coding skills?”

The answer is: YES! And it only takes a week!

Recently, developer @chongdashu built 4 complete 3D games in just one week: an endless runner, a tower defense game, a Mario Party-style minigame, and a full 3D arena shooter. The magic? He used “Vibe Coding” — you simply describe your ideas in natural language, and AI writes the code, generates assets, and handles debugging for you!

Today, I’ll walk you through this revolutionary approach to game development, step by step.

📱 See It in Action: All Made by AI!

This is a fully AI-generated 3D point-and-click adventure game featuring:

✅ Complete 3D character models (with skeletal animations)
✅ Beautiful 2.5D background scenes
✅ Background music and full voice acting
✅ Built-in level editor
✅ iOS and Android mobile support

The key point: The developer didn’t write a single line of code by hand — everything was “chatted” into existence with AI tools!

🤔 What is Vibe Coding?

Vibe Coding is a revolutionary development approach coined by AI researcher Andrej Karpathy. The core concept:

Describe ideas, not code → AI implements → Test and feedback → Iterate → Done

Traditional development:

Learn programming → Write code → Debug → Modify code → Debug again... (months)

Vibe Coding approach:

Describe idea → AI generates code → Play and test → Tell AI improvements → Done! (days)

It’s as simple as chatting with a super-programmer!

🛠️ Your Toolkit: What You Need

1️⃣ AI Coding Assistants (Choose One)

Tool	Strengths	Best For
Claude Code	Strong code comprehension, complex projects	Quality-focused developers
Codex CLI	High autonomy, long independent work sessions	Projects requiring extensive iteration
Cursor	User-friendly interface, high integration	Beginners

💡 Recommended Combo: Claude Code (primary) + Codex CLI (auxiliary)

2️⃣ AI Models (Choose Based on Needs)

GPT-5.2/5.3/5.4: Excellent at planning and architecture
Claude Opus 4.5/4.6: High code quality, strong comprehension
Gemini 3 Flash: Rapid prototyping

3️⃣ Game Engines

ThreeJS: 3D web games, cross-platform
PhaserJS: 2D games, simple and easy

4️⃣ Supporting Tools

Nano Banana Pro: AI-generated concept art
Meshy: Image-to-3D models (with rigging and animation)
Playwright: Automated testing

🎯 Hands-On Tutorial: Build Your First 3D Game in 7 Steps

Step 1: Set Up Agent Skills

Agent Skills are like installing “professional skill packs” for AI, teaching it game development.

How to do it:

Download the ThreeJS Builder Skill
Copy to your project folder:.claude/skills/threejs-builder/ or .codex/skills/threejs-builder/
Verify the skill is loaded:In Claude Code: "What skills do you have?" In Codex CLI: "skills"

What’s included in this skill pack?

Scene setup and rendering pipeline
GLTF/GLB model loading
Animation blending system
Shaders and post-processing effects
Game state machine and parallax effects

Step 2: Acquire Game Assets

Important tip: Don’t let AI generate assets from scratch!

Why?

❌ AI-generated assets have inconsistent styles
❌ Missing animations and textures
❌ Format compatibility issues

The right approach: Use existing asset packs

Recommended asset websites:

Quaternius (Free CC0 license)
- Cube World: Cartoon-style 3D assets
- Toon Shooter Kit: Shooter game asset pack
- URL: quaternius.com
itch.io
- Tons of indie developer assets
- Always check the license

How to do it:

1. Download asset pack (ZIP format)

2. Extract to project folder:

public/assets/cubeworld/

3. Create asset index JSON file

Asset index example:

{

"pirate": {

"model": "pirate_skeleton.glb",

"animations": {

"idle": { "clip": "Idle", "duration": 2.0, "loop": true },

"walk": { "clip": "Walk", "duration": 1.0, "loop": true },

"run": { "clip": "Run", "duration": 0.8, "loop": true }

}

Step 3: Generate 3D Characters (Optional)

If you want unique characters, use AI to generate them:

Tool chain: Gemini → Nano Banana Pro → Meshy

3.1 Generate Concept Art with Gemini

Prompt template:

Following Nano Banana Pro's prompt guidelines,

generate a cartoon-style pirate character with:

- T-pose stance (arms extended horizontally)

- Front and back views

- Style: whimsical

- Suitable for 3D model conversion

Key tips:

✅ Let Gemini learn Nano Banana Pro’s prompt guide first
✅ Enable “thinking mode” for better results
✅ Ensure character faces forward (easier for 3D conversion)

3.2 Convert to 3D Model with Meshy

Visit meshy.ai
Select “Image to 3D”
Upload front and back images
Choose T-pose stance
Wait 2-3 minutes for generation

Output:

Textured 3D model (GLB format)
Automatic rigging
Basic animations (walk, run, idle)

Step 4: Build Game Scene with AI

Now the real Vibe Coding begins!

Prompt Example 1: Create Basic Scene

Create a 3D game scene using ThreeJS:

1. Load all models from public/assets/cubeworld/

2. Create a 20x20 ground grid

3. Add skybox and ambient lighting

4. Set up orbit camera controls

5. Implement in a single HTML file using Vite dev server

Requirements:

- Use ThreeJS r150+

- Support touch controls (mobile)

- 60 FPS performance

AI will automatically:

Create complete project structure
Write HTML, CSS, JavaScript
Configure Vite build tool
Implement camera controls and interactions

Prompt Example 2: Add Character Control

Add character control to the existing scene:

1. Load pirate character model

2. Implement WASD keyboard controls

3. Switch animations based on movement speed (idle/walk/run)

4. Camera follows character

5. Add collision detection

Reference animation definitions in assets_index.json

Prompt Example 3: Add Game Mechanics

Implement a simple collection game:

1. Randomly spawn 10 treasure chests in the scene

2. Show prompt when character approaches chest

3. Press E to collect chest

4. Display collection progress UI (top-right corner)

5. Show victory screen when all chests collected

Use state machine to manage game states

Step 5: Test and Iterate

The core of Vibe Coding: Play and improve!

Testing workflow:

Start local servernpm run dev
Play the game in browser
- Test all features
- Record bugs and improvements
Tell AI the issuesFound the following issues: 1. Character movement too slow 2. Camera angle too close 3. Chest collision range too small 4. Missing background music Please fix these issues one by one
AI automatically fixes and tests

Advanced tip: Use Playwright for automated testing

Create automated test script:

1. Test if character can move normally

2. Test if all animations play correctly

3. Test chest collection logic

4. Screenshot comparison for visual effects

Step 6: Add Sound Effects and Voice Acting

Prompt example:

Add audio to the game:

1. Background music:

- Loop light adventure music

- Volume 30%

- Support mute toggle

2. Sound effects:

- Footsteps (vary with movement speed)

- Chest opening sound

- Item collection sound

3. Character voice acting:

- Use ElevenLabs API

- Character: Humorous pirate

- Lines: Opening, collecting chests, victory

Implement audio manager with volume controls

Free sound effect resources:

Step 7: Deploy to Mobile Devices

Package as native app using Capacitor

Prompt:

Package the game as iOS app using Capacitor:

1. Install Capacitor dependencies

2. Configure capacitor.config.json

3. Add iOS platform

4. Optimize touch controls:

- Single finger to rotate camera

- Two fingers to zoom

- Virtual joystick for character control

5. Sync and build iOS project

Ensure smooth performance on iPhone (60 FPS)

Deploy to web:

npm run build

# Deploy to Vercel/Netlify/GitHub Pages

🎨 Advanced Techniques: Make Your Game Professional

1. Use PRD (Product Requirements Document)

Don’t ask AI to write code directly — plan first:

Create a PRD for a tower defense game:

Core gameplay:

- Enemies walk from entrance to exit

- Player places defense towers to stop enemies

- Defeat enemies to earn coins

- Use coins to upgrade towers

Tech stack:

- ThreeJS + PhaserJS

- State management: Zustand

- Physics engine: Not needed

Level design:

- 3 levels with increasing difficulty

- 5 enemy types

- 4 tower types

Generate complete PRD and Technical Design Document (TDD)

2. Use TDD (Technical Design Document)

Based on the PRD above, generate TDD:

1. Project structure

2. Core classes and interfaces

3. Data flow design

4. Performance optimization strategy

5. Testing plan

Output in Markdown format

3. Implement Step by Step

Following the TDD, implement step by step:

Step 1: Implement map and pathfinding system

- Create grid map

- Implement A* pathfinding algorithm

- Visualize paths

Wait for my confirmation before continuing

💡 Useful Prompt Templates

Debugging Prompt

The game shows the following error:

[Paste error message]

Current code:

[Paste relevant code]

Please analyze the cause and fix it

Optimization Prompt

The game only runs at 30 FPS on mobile devices

Please optimize performance:

1. Reduce draw calls

2. Use object pooling

3. Optimize shadows and lighting

4. LOD (Level of Detail) management

Target: 60 FPS on iPhone 12

Feature Addition Prompt

Add multiplayer functionality to the existing game:

1. Use WebSocket for real-time sync

2. Display other players' positions and animations

3. Implement simple chat system

4. Handle network latency and reconnection

Backend using Node.js + Socket.io

📊 Real Case Study: 4 Games in One Week

Developer: @chongdashu

Game Type	Dev Time	Main Tech	Highlights
Endless Runner	1.5 days	ThreeJS	Procedural level generation
Tower Defense	2 days	ThreeJS + AI enemies	Smart pathfinding system
Mario Party	1 day	ThreeJS	Local multiplayer
Arena Shooter	2.5 days	ThreeJS + Physics	Complete weapon system

Total investment:

Time: 7 days
Cost: ~$20 (AI API calls)
Lines of code: 0 hand-written, 15,000+ AI-generated

Key success factors:

✅ Use high-quality Agent Skills
✅ Choose appropriate existing assets
✅ Clear requirement descriptions
✅ Rapid iteration and testing
✅ Leverage strengths of multiple AI models

🚀 Start Your Game Development Journey Now

Beginner Roadmap

Week 1: Familiarize with tools

Install Claude Code or Cursor
Learn basic prompting techniques
Follow tutorial to create a simple 3D scene

Week 2: Make your first game

Choose simple game type (e.g., collection game)
Use existing asset packs
Complete basic gameplay

Week 3: Add advanced features

Sound effects and music
UI interface
Level system

Week 4: Publish and share

Deploy to web
Package as mobile app
Share on social media

Recommended Learning Resources

YouTube Channel
- Chong-U — AI Oriented Dev
- 18K+ subscribers, 84 tutorial videos
GitHub Projects
- threejs-capacitor-ios-game
- phaserjs-oakwoods
- threejs-toonshooter
Online Courses
- BuilderPack.ai (paid, includes complete workflow)
- Insiders Club (free resources)
Communities
- Reddit: r/ClaudeCode, r/vibecoding
- Discord: AI Builders Community

⚠️ Common Issues and Solutions

Q1: What if AI-generated code has bugs?

A: This is normal! Solution:

1. Copy the error message

2. Tell AI: "Got this error: [error message], please fix"

3. If it fails multiple times, try a different AI model

4. Break the problem into smaller steps

Q2: How to optimize poor game performance?

A: Use performance analysis prompt:

Analyze game performance bottlenecks:

1. Use Chrome DevTools performance profiler

2. Identify high-cost functions

3. Provide optimization suggestions

4. Implement optimizations and compare results

Q3: How to maintain code quality?

A: Use code review prompt:

Review current code:

1. Check code structure and organization

2. Identify duplicate code

3. Suggest refactoring approaches

4. Add necessary comments

5. Ensure best practices compliance

Q4: How to coordinate multiple AI tools?

A: Recommended combination:

GPT-5.2: Planning and architecture design
Claude Opus 4.6: Core code implementation
Nano Banana Pro: Asset generation
Playwright: Automated testing

Q5: Do I need to learn programming?

No coding experience: Can make simple games (collection, runner)
Basic understanding: Can make moderately complex games (tower defense, shooter)
Programming experience: Can make complex games and optimize performance

Suggestion: Learn while building — AI will teach you many programming concepts!

🎯 Summary: Advantages and Limitations of Vibe Coding

✅ Advantages

Very low barrier: No deep programming background needed
Rapid prototyping: Validate game ideas in days
Learning tool: AI explains code logic
Lower costs: Indie developers can make 3D games
Fast iteration: Modify ideas by simply re-describing

⚠️ Limitations

Complex logic: AI may misunderstand, requiring multiple iterations
Performance optimization: Advanced optimization still needs manual intervention
Creative constraints: AI better at common game types
Network dependency: Requires stable API access
Cost accumulation: API fees for large projects can add up

Best Practices

✅ Start with small projects
✅ Use existing assets
✅ Keep requirements clear
✅ Test frequently with feedback
✅ Leverage multiple AI tools
✅ Record successful prompts
✅ Join developer communities

🌟 Conclusion

Vibe Coding isn’t magic, but it truly lowers the barrier to game development.

You don’t need to be a programming master or learn complex game engines. As long as you have creativity, patience, and can “chat,” you can make your own games.

Start now!

Pick a simple game idea, open Claude Code or Cursor, and type your first prompt:

I want to make a simple 3D collection game,

where the player controls a character to collect gems in a scene,

implemented with ThreeJS.

Please help me plan the project structure and development steps.

Then, watch the magic happen! ✨

@chongdashu YouTube Channel: AI Oriented Dev
GitHub Project Collection: github.com/chongdashu
BuilderPack.ai: Complete workflow and asset packs
Quaternius Free Assets: quaternius.com
Meshy 3D Generation: meshy.ai
ThreeJS Official Docs: threejs.org

💬 Are you ready to make games with AI?

Tell me in the comments:

What type of game do you want to make?
What’s your biggest challenge?
What other AI development techniques would you like to learn?

Follow me for more AI development tutorials! 🚀