BetaOpen beta: try it and tell us what breaks

Build real games
with an agent that knows the engine.

GRIT is a free 2D and 3D game engine with the systems other engines sell as add-ons built in, and an agent that authors the whole game with you: scenes, models, materials, sound, gameplay and the store page. Describe it in Vibe mode, or take full control in the Studio.

Get GRIT free See every feature

engine, agent and every built-in system: Free
built-in studios, from shader graphs to localization: 34
Claude, Gemini, any OpenAI-compatible API, or local: Any AI
from editor to a playable web link: 1 click

GPU lightmapper◆
Volumetric clouds◆
Weather & day/night◆
Water & waterfalls◆
Shell fur◆
SDF terrain & caves◆
Erosion◆
Roads & splines◆
Vehicles◆
GPU cloth◆
GPU fluids◆
Destruction◆
Ragdolls◆
Navmesh crowds◆
GPU flocking◆
Procedural gait & IK◆
Shader graph◆
VFX graph◆
Texture graph◆
Encrypted netcode◆
Encrypted saves◆
Minimap & fog of war◆
Building placement◆
Damage numbers◆
Localization◆
Playtest heatmaps◆
C# scripting◆
GPU lightmapper◆
Volumetric clouds◆
Weather & day/night◆
Water & waterfalls◆
Shell fur◆
SDF terrain & caves◆
Erosion◆
Roads & splines◆
Vehicles◆
GPU cloth◆
GPU fluids◆
Destruction◆
Ragdolls◆
Navmesh crowds◆
GPU flocking◆
Procedural gait & IK◆
Shader graph◆
VFX graph◆
Texture graph◆
Encrypted netcode◆
Encrypted saves◆
Minimap & fog of war◆
Building placement◆
Damage numbers◆
Localization◆
Playtest heatmaps◆
C# scripting◆

Two ways to build

Guide it, or drive it yourself.

Same engine, same project, same agent. Vibe mode keeps you in a conversation; Studio puts every tool in front of you. Switch from the top bar whenever you like.

Vibe mode: the agent chat beside the running gameScreenshot coming soon

Vibe mode

Describe your game. The agent builds it.

One conversation with the Scene and Game views beside it, and the studios you want pinned as widgets.
A guided journey from idea to release: reference, character, block-out, first playable, feel, content, look, juice and audio, menus, ship.
Choose how much it asks: about every creative choice, only when it's blocked, or not at all.
A version is saved at each finished phase, and F9 in play mode flags a problem as a fix card.

Studio mode: the docked editor with the agent panelScreenshot coming soon

Studio mode

The full editor, with the agent beside you.

Scene, hierarchy, inspector and every studio, docked the way you work.
The agent asks before it runs anything, shows the diff, and every step can be undone.
A code editor with IntelliSense, a terminal and a Git panel in the same window.
Hand the agent a task, or take the controls yourself mid-task. Same project, same tools.

Full game authoring

Past the block-out, all the way to a game.

The agent works through the same typed commands as the editor, so it can take a game from first scene to published page, and you can inspect every step.

Edits through typed engine commands
436 validated commands, the same ones the editor uses. Bad input is rejected before it touches your scene, and every edit can be undone.
Authors 3D models and characters
Props and rigged, animated characters built in staged Blender runs, with review sheets, motion checks and an Animator ready to drive them. Needs Blender 4.2 or later installed.
Shops the library for you
Searches models, PBR materials, textures, decals, sounds, fonts and UI kits by meaning, and places them at real-world scale.
Generates what's missing
Procedural trees, rocks and plants, pixel sprites, tiling PBR textures, HDRI skies and sounds. Anything only you can supply, like a voice line, becomes a request it waits on.
Checks its own work
It looks at the game view, runs headless playtests that report deaths, stuck spots, unreachable areas and heatmaps, and reads the profiler.
Ships it
Publishes the web build and fills in the game page with screenshots captured from the running game, once you approve.

agent · valley.sceneclaude · byo key

›

Bring your own AI: your keys, stored encrypted, with no markup on tokens.

Anthropic

Claude

BYO

Google

Gemini

BYO

OpenAI-compatible

Any /v1 endpoint

BYO

Ollama

Local models

BYO

Made in GRIT

Short games, real systems.

Each demo is built in GRIT with the agent and recorded straight from the engine. No offline renders, no paintovers.

Recording soon

Arcade racing

Untitled racerVehicles · Volumetric clouds · Motion blur

Recording soon

Open-world survival

Untitled survivalTerrain streaming · Foliage · Weather

Recording soon

Multiplayer arena

Untitled arenaNetcode · Ragdolls · VFX graph

Recording soon

2D platformer

Untitled platformerTilemaps · Physics 2D · Touch controls

In the box

The add-ons you'd buy elsewhere ship with GRIT.

Weather and day/night, water, volumetric clouds, cave terrain, roads, destruction, fluids: on most engines these are separate store purchases with their own update cycles. In GRIT they're first-party, documented for your agent, free, and they work together.

See every feature →