From Single Player to Multiplayer With One Skill - Opus 4.7, GPT 5.4, Claude Code, Codex, Colyseus
🚀 VibeGameDev — AI Game Dev Resources, Skills, Source Code & Playbooks ► https://aiod.dev/jzc 🕵 FREE Resources + Weekly Insider Updates ► https://aiod.dev/a6r 🧰 Get My FULL AI Builder System (ALL ACCESS) ► https://aiod.dev/wkr 🎮 Get the Vibe Jam Starter Pack (FREE) ► https://aiod.dev/6cp Think multiplayer is too hard for solo devs? Last night, strangers played my AI-built game online — and I went from single player to live multiplayer with one prompt and one agent skill. We aren't building a basic lobby demo; we're taking a fully polished single player fighting game — with melee combos, projectile attacks, screen shake, and AI-generated pixel art — and making it multiplayer with Colyseus, deployed live on the web for anyone to join. 🛠️ THE STACK • Framework: Colyseus (open-source, Node.js multiplayer framework) • Game Engine: Phaser 4 (2D game logic, physics, rendering) • AI Tools: Codex CLI, Claude Code (Opus 4.6/4.7), GPT 5.4 (tool-agnostic workflow) • Skills: Custom colyseus-multiplayer agent skill (available on VibeGameDev) • Hosting: Vercel (client) + Colyseus Cloud (server) • Assets: itch.io packs + AI-generated sprites via Retro Diffusion 🚀 WHAT YOU'LL LEARN • How to build a Colyseus multiplayer agent skill by studying docs with multiple AI models • Going from single player to multiplayer with one prompt and one plan • Running and testing multiplayer locally (client + server) • Deploying the client to Vercel and the server to Colyseus Cloud • Multiplayer optimisation: client-side prediction, server authority, interpolation • Why 15+ years of multiplayer experience says: let the client predict, let the server validate 🕒 TIMESTAMPS 00:00 Intro 03:00 Step 0: Choose Your AI Tool 03:18 Step 1: Single Player Game 04:41 Step 2: Colyseus 05:37 Step 3: colyseus-multiplayer Skill 06:49 Step 4: Use Skill to Pl an and Implement 07:49 Step 5: Run locally 09:02 Step 6a: Deploying the Client 10:01 Step 6b: Deploying the server 12:38 Step 7: Optimisation 14:59 Wrap Up 🔗 LINKS • Colyseus: https://colyseus.io #vibecoding #aigamedev #gpt5 #claudecode #codex #indiedev #opus4.7 #opus47 #opus47 #claudeopus #cursor #codex #vibegamedev #vibejam