Public beta · Windows

The game editor you build with AI agents.

Describe what you want. Harmony, In-gen's built-in agent, writes the gameplay, places the scene and plays it back to check its work, and you see every change it makes.

Download for Windows See games made with it

Latest beta · Windows installer

Harmony, built in

Ask in plain words. Harmony edits the project, shows you every change, and plans long jobs step by step so you can stop and pick up later.

Bring your own agent

Claude, ChatGPT, Gemini or Antigravity: sign in with your subscription, use an API key, or drive In-gen from Claude Code or Codex over MCP. The first launch walks you through it.

Rules you can tune

Gameplay lives in Systems and data sheets, not buried in code. Change a number in a sheet and the game follows, no agent needed.

Ship it

Build Game turns a project into a Windows app or a folder that runs in the browser. That's how Districts plays on Gen Haven.

Inside In-gen

In-gen editing a tabletop city, with Harmony listing the steps it took to add a bakery. — **Ask, then check.** Harmony makes the change, plays the game to test it, and lists what it touched.

In-gen's Systems tab showing a Shops data sheet with costs, upkeep and jobs. — **Sheets, not magic numbers.** Every System names the sheet it reads.

In-gen's Play tab running a village game while Harmony notes what it changed after watching. — **Watch Me Play.** Harmony plays along and tunes what feels off.

Screens are illustrations of In-gen.

Gen Haven

Games made with In-gen, playable in your browser.

Start with Districts, a cozy city builder on a tabletop map.

Visit Gen Haven