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Summer is the AI game engine built for people and agents to make games together. Not just to build a game, but to launch it, learn from it and make it successful. Every tool for that is here, in one place. For people, Summer Engine is an editor with Summer Agent built in. It has the same tools your own agent gets. For agents, the Summer MCP and CLI reach everything: bring Claude Code, Codex, Cursor, Hermes or any agent you like, add one URL and sign in once. Make it. A full engine for full 2D and 3D games: physics, animation, real code in C++, C# or scripts. Your agent makes images, 3D models, textures, sound effects, music and cutscene video with the frontier generative models, at API cost, plus more than 175,000 free assets. Summer is built on core Godot and follows upstream, so you can bring a Godot project and keep building it here. It is open: build your own plugins, and let your agent build custom tools for your game, like a quest maker or an audio designer, right inside Summer Studio for your whole team. Make it together. On the Summer Board you, your friends and your agents work on one live board. Talk, draw, and your agent jumps in and starts working. Use Summer Agent or bring your own. Make it multiplayer. Every Summer game can go online with the Summer SDK: Summer runs the servers, matchmaking, parties, saves, leaderboards and store. Start from a multiplayer template and make it your own. One build plays across iPhone, Android, Mac and Windows on Summer Games, and cross-play on Steam and itch.io is coming. Launch it anywhere. Windows, Mac, Linux, iOS, Android and the web; consoles take extra porting work. Your agent publishes on Summer Games hands-free through the MCP: it makes the store page, uploads the build, and the game goes live once you say yes and Summer’s checks pass. Steam, itch.io or your own site work too, and Summer Games also takes builds made in other engines. Grow it. Track everything that happens in your game, and let your agent read the analytics, talk with your players and make the game better. Tools for organic content and ads are rolling out. Fair by design. The engine and the MCP are free. You pay only for what you use: a plan with every frontier model in one place, or top up any amount. When your game sells on Summer Games, Summer takes 30% of sales. If it does not sell, you pay nothing for that. We win when you win.

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Start here

Follow this path in order:

1. Connect your AI agent

Add one URL and sign in. Engine work: one command. Claude Code, Codex, Cursor, Claude, ChatGPT and many more.

2. Install Summer Engine

Download it for Mac or Windows, or let your agent install it.

3. Make your first game

Describe the game. Your agent builds it and you play it.

4. Make it multiplayer

Summer runs the servers. Your agent adds the online part.

5. Add what your game needs

Matchmaking, parties, saves, leaderboards, chat and a store.

6. Publish

Go live on summer.games. Your agent does the steps, you approve.

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Other ways to start

How do I make a game with Summer Agent?

Describe your game in the Summer app. Summer Agent builds it while you watch.

How do I use the Summer Engine CLI and MCP?

The CLI installs and runs Summer Engine, and runs any Summer operation from a shell: summer <area> <action>.

How do I make a PC game with Summer Agent?

Build and export a Windows game with Summer Agent

How do I make a Mac game with Summer Agent?

Build and export a macOS game with Summer Agent

How do I make a web game with Summer Agent?

Create a browser-playable game with Summer Agent

How do I make an iOS game with Summer Agent?

Build and export an iPhone or iPad game with Summer Agent

How do I make an Android game with Summer Agent?

Build and export an Android game with Summer Agent

How do I make a console game with Summer Agent?

Build a Nintendo Switch, PlayStation, or Xbox game with Summer Agent

How do I make a PlayStation game with Summer Agent?

Build and export a PlayStation game with Summer Agent

How do I migrate from Unity to Summer Engine?

Rebuild your Unity project in Summer Engine with Summer Agent

How do I migrate from Unreal to Summer Engine?

Rebuild your Unreal project in Summer Engine with Summer Agent

Bringing an existing project?

Open the game you already have in Summer Engine and keep building it with AI.

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How Do I Make Games with My IDE?

Add Summer Engine to Cursor, Claude Code, Devin Desktop, or your favorite AI-powered editor:

How do I make a game with Cursor?

Add Summer Engine to Cursor. One-click or manual config. Full page.

How do I make a game with Claude Code?

Add Summer Engine to Claude Code. Full setup guide.

How do I make a game with Devin Desktop?

Add Summer Engine to Devin Desktop. Full setup guide.

How do I make a game with Antigravity?

Add Summer Engine to Antigravity. Full setup guide.

How do I make a game with Codex?

Add Summer Engine to Codex. Full setup guide.

How do I make a game with VS Code or GitHub Copilot?

Add Summer Engine to VS Code or Copilot. Full setup guide.

How do I make a game with Zed?

Add Summer Engine to Zed. Full setup guide.

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Learn

Deep dives into Summer Engine’s capabilities:

MCP: Build with Cursor, Claude, Devin Desktop, Antigravity, Codex, VS Code, Zed

How to make games with Summer Engine from your IDE. MCP setup, CLI, API reference.

AI Operations

How Summer Engine modifies your project safely through natural language

Project Intelligence

How AI understands your entire codebase, scenes, and assets

Asset Generation

Create 2D art, 3D models, and audio with AI

Publishing Your Game

Export for desktop, mobile and the web, then publish on Summer Games, Steam or your own site.

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Knowledge Base

Common questions about Summer Engine:

What is Summer Engine?

The AI game engine for people and agents.

Is Summer Engine compatible with my existing project?

Bring your project over: commit a copy, open it, check plugins and exports.

Is my code safe?

Encrypted in transit and at rest, never sold. What AI providers see, and how training use works.

How good are AI-generated assets?

3D models, characters, textures, sprites and audio, made to ship in your game.

Can I make a game with just AI, no coding?

Yes. Describe the game and your agent writes all the code.

How do I get support?

Ask in Discord first for the fastest reply, then email for concrete help.

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What You Can Do

Describe a whole game in plain words or go deep into engine code. Summer Engine does both.

Scene Operations

Describe scene changes in plain English - “Add a player that can jump”

Project Intelligence

AI understands your entire project - code, scenes, assets, and relationships

Specialist Agents

A team of researcher, builder, asset maker, verifier and advisor that the main agent hands work to

Asset Generation

Generate 2D art, 3D models, characters, audio and video for your game

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For Pros and New Game Devs

Summer Engine is for everyone who makes games: describe a game in plain words, or take full control of a professional engine.

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For Creators & Vibe Coders

  • Describe it, play it: tell your agent the game you want and play it minutes later
  • Art and sound included: generate 3D models, characters, textures, sprites and audio in the engine
  • Online from day one: multiplayer, saves and leaderboards without running a server
  • Focus on fun: skip the boilerplate and get straight to the gameplay

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For Professional Developers

  • Ship commercial games: We shipped Don’t Pray on Steam in 2.5 months using Summer Engine
  • Full engine access: total control over every node and script, with native C++ and C# when you need it
  • Clean code: your agent writes structured code you can read and own
  • Faster everything: hand the tedious work to agents and spend your time on design and polish
Agents do the heavy lifting, and you can go as deep as you want.

Unified Workflow

One editor, one context. Design, code, and playtest without tab juggling.

Expert AI Agents

The main agent hands work to specialists that run in parallel and report back in your chat.

Safe AI Operations

Scene edits go through engine operations with undo. File writes return exact receipts and refuse stale overwrites.

Open Existing Projects

Evaluate a committed copy of an existing project. Familiar formats and concepts reduce migration work; verify imports, plugins, native extensions, and exports against the current Summer Engine release.

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Ready to Build?

Download Summer Engine

Get started with the AI game engine today

Browse Game Templates

Start from a template: shooter, RPG, platformer, horror, and more
Need help? Ask in Discord first. That is where you get the fastest reply and support. For concrete help, email support@summerengine.com or founders@summerengine.com.