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The engine under every game.

Gamesteel runs 2D games in the browser. A game is a text you can read and TypeScript the engine runs sixty times a second, and your agent builds it through the engine's tools, then plays it before you do.

Everything your agent can reach

Forty-eight tools over MCP, in eight branches.

Stores, privacy policies, ads, online services and purchases: the same 15 tools.

Your agent

Claude Code, Codex, Cursor and 28 more, over MCP

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Updates

  • Game

    Opens and starts games, saves them to the library, and knows every part a type can have.

    • games open
    • games new
    • games import
    • games list
    • games maze
    • library components
    • library component

  • Code

    Reads and writes the game text and its scripts, all of an edit or none of it; finds where things are, undoes and redoes, reads what the others changed, and keeps the game's team board.

    • read code
    • read scene
    • read type
    • write_code
    • edit
    • search text
    • search references
    • read changes
    • undo
    • undo redo
    • team

  • Design

    One style for the whole game, and its type: a title face and a face for its interface, from open-licence fonts.

    • style set
    • style fonts
    • style font

  • Art

    Paints pictures, animations and tilesets in code, models 3D art in Blender, and knows what every game already has.

    • art paint
    • art model
    • art read
    • undo art
    • art list
    • library made

  • Sound

    Designs effects from oscillators, FM and noise, levelled to a loudness, and hears each one back.

    • sound design
    • sound list
    • sound listen

  • Music

    Composes on 168 instruments, in layers a script can fade, and hears it back in numbers, words and a picture.

    • sound compose
    • sound listen

  • Playtest

    Plays the game headless, with exact keys or a player of its own, looks at it, and goes back to a saved moment.

    • playtest play
    • playtest until
    • playtest look
    • playtest inspect
    • playtest snapshot
    • playtest restore
    • playtest reset
    • games replay
    • games simulate
    • games validate

  • Ship

    Makes the finished game an Android app and the Xcode project for an iPhone one, and its films into video.

    • app settings
    • app build
    • app status
    • film render

External tools

Free programs outside Gamesteel that your agent's tools use while it makes a game. The Gamesteel program your agent runs uses each one on your own machine, when it is installed.

Blender
Free, open-source 3D software. Your agent's art model builds characters, ships and props from short scripts, and Blender renders them, frame by frame, as the game's own art. Blender runs on your own machine, when it is installed: the Gamesteel program finds it there. About Blender