Pre-alpha · Rust · native + WebGPU

Make games with an engine proven by games.

Sindri is a 2D and 3D game engine with its own visual editor, a typed gameplay language called Decay, and responsive Weave UI. Every game below runs on it, and you can play each one right here in your browser.

Play Causeway See every game

Causeway: three wardens defend a lit low-poly island while the Hollow approach

Causeway · play in browser

6games, all playable here

23demos, labs and tools

1renderer for desktop and browser

MITor Apache-2.0, open source

Running on Sindri

Real games, each with a job to do.

A feature is not finished in Sindri until a game uses it. The flagships push the engine hardest; the genre showcases are small, complete games you can copy to start your own.

Flagship

Causeway

Three wardens hold small islands against the Hollow, who cross the causeway at low tide, until the rising sea drowns them. Every Hollow shows what it will strike before it strikes, so each turn is a puzzle with a visible answer.

Lit low-poly 3D with imported GLB models
Picking through a pointer ray
Weather, water and lava shaders
Weave HUD and menus
Turn logic written in Decay

Play Causeway Source ↗

Flagship

Orbital Last Stand

The fleet is gone and someone has to hold the line. Build an unlikely warship while an evacuation corridor closes: survive five sectors over ten minutes, or take a field kit into a twelve-boss gauntlet. Firing is automatic; movement, timing your burst and choosing a build make the difference.

160 modules, 15 enemy types and 12 bosses in Decay
Prefabs and pooled spawning at scale
Baked 3D sprite sheets
Weave menus that fit a phone
Saved progress and settings

Play Orbital Last Stand Source ↗

Genre showcases

One small, complete game per genre. Each proves Sindri can make that kind of game, and is the project to copy when you start one.

Genre showcase

Platformer

The platformer showcase: run, jump and collect coins on the way to the flag.

Genre showcase

Scorchball

Local multiplayer football for two to four controllers.

Genre showcase

Low Tide

Drive your home across a drained sea ahead of the returning Tide.

Genre showcase

Flappy

A small flapping arcade game.

Feature examples & labs

One feature at a time.

Small projects that show one bigger feature on its own, small enough to read in a few minutes. Every one opens in the editor and plays here in the browser.

Feature example

Tween Lab

Compare five easing curves with managed Decay playback controls.

Feature example

Camera Lab

Explore camera follow, dead zones, smoothing, confinement and impact shake.

Feature example

Spatial Query Lab

Explore nearest targets and ordered radius results with tags, active state and parent transforms.

Feature example

Physics Playground

A room full of contraptions, from a wrecking ball to a crane, with tools to grab, blast, spawn and probe them.

Feature example

Input Actions

Steer by what you mean, not what you press, and rebind boost to any key or button while it runs.

Feature example

Sound Mixer

Turn the master, music and effects buses up and down while the theme plays.

Feature example

Sequence Stage

A ship flies in on a sequence authored in the Timeline, with sound cues, then the stage idles on a loop. Space or tap replays it.

Feature example

Sprite Shaders

Four project WGSL sprite shaders side by side: a pulsing outline, a dissolve, a hit flash and a wave. Scripts drive the burn and the flash through each sprite's shader parameters; Space flashes.

Feature example

Sprite Masks

A keyhole wanders over a night sky: the night is masked outside it so a sunny meadow shows through, and a gem masked inside it is only ever seen through the hole.

Feature example

Weave Control Room

Toggle, type and scroll through engine widgets styled by Weave.

Feature example

Weave UI

Explore CSS-inspired responsive UI, layouts and presentation rules.

Lab

Voxel Lab

Inspect voxel terrain, meshing and rendering effects.

Tool

Normal Map Studio

Make normal maps from an image or height map, then preview and download them.

Tool

Particle Lab

Design and preview Sindri particle emitters.

Tool

Sound Lab

Make game sound effects and chiptune music in the browser, then download them.

Tool

Sprite Baker

Drop in a Blender model (.glb, .gltf, .obj or a .zip of one) or write a recipe, and bake it into ordinary Sindri sprites in the browser, in isometric, top-down or side view.

Lab

Shapes Lab

Procedural shapes and geometry in motion.

Feature example

3D Transform Lab

A cube faces a raised goal and walks to it in world space while the camera orbits the scene.

Feature example

3D Orbit Camera Lab

A third-person orbit camera follows a walker, pulls in past a barrier and eases back out. Right-drag, or click to capture the pointer, to look around.

Feature example

3D Character Lab

Ride a ferry, jump off and walk to the goal pad with grounded 3D character movement. WASD moves, Space jumps.

Feature example

Model Collision Lab

Walk around a wall that collides from an imported GLB's own triangles. WASD moves.

Feature example

3D Lighting Lab

Point and spot lights, the sun, ambient fill and the sky change color and direction from Decay.

Feature example

Day/Night Lab

A twelve-second day moves through sunrise, midday, sunset and night, then mounted lights take over.

How you build

An editor, a language and a UI system, made together.

Games are authored in the editor, Decay and Weave. Rust is what the engine is written in, not something you need to write a game. Native and browser builds share one runtime, one scene format and one renderer.

Editor

A native editor working on the same world the game runs: hierarchy, inspector, asset browser, sprite slicing, a Timeline, undo, and Play, Pause and Stop on the real engine.

Decay

A statically typed gameplay language. Game state, events, input, physics, spawning, audio and UI live in Decay scripts, checked before they run.

Weave

Responsive presentation for game UI. Styles and layout rules recompose one interface for a desktop, a phone held upright and a phone on its side.

Engine

2D and 3D in one scene model: sprites, tilemaps, voxels, lit GLB models and shadows, Rapier physics, audio buses and gamepads, built on wgpu.

The Sindri editor with the Orbital Last Stand scene open — sindri editor · games/orbital-baked/assets/orbital.scene

Captured by a binary in the repository rather than a screen grab, so it can be retaken after every change.

Decay

A gameplay language that refuses to guess.

Decay is Rust-inspired and statically typed, without ownership, lifetimes or unsafe. A misspelled host member, a wrong event payload or a mismatched type is a diagnostic with a source location, not a mystery at runtime.

@export fields show up in the editor without running the script
Typed events, messages, shared state and script references
Vec2, Vec3, arrays, maps and bounded loops
A language server with completion, hover and diagnostics

Language reference Host API

player.decaydecay-lsp

script Player {
    @export
    var speed: number = 6.0;

    fn update(dt: number) {
        let movement = Input.axis("ArrowLeft", "ArrowRight");
        this.transfrom.position.x += movement * speed * dt;
    }
}

player.decay:7:9: error[decay-semantic/unknown-member]: `Player` has no member `transfrom`

Honest about the gaps

Some large pieces don't exist yet, and Sindri doesn't pretend they do.

Skeletal animation and animation state machines

A Decay debugger, formatter and coroutines

Navmesh navigation and steering

Scene streaming and texture compression

Spatial audio

Accessibility labels in game UI

Each gap has a row in the parity table, set against what an engine is expected to do. Working code beats plausible architecture: it makes progress slower than ticking boxes on a roadmap, and it makes the boxes mean something.

Documentation

Learn the model, not just the API.

The contracts live beside the code and change with it, so they describe what the engine does today rather than what it hopes to do.

Getting startedBuild and run Sindri → CapabilitiesWhat demonstrably works today → Decay scriptingThe host API Decay can call → Weave UIResponsive presentation → Web exportBuild and deploy a project → ParityWhere Sindri stands against expectation →

Open a game in the editor.

Requires Rust 1.95. Dual-licensed MIT or Apache-2.0. Open any project folder, such as games/platformer, and press Play.

shell

$ git clone https://github.com/vardirhq/sindri-engine
$ cd sindri-engine
$ cargo run --package sindri-editor