SpottedcatBuild 2D and 3D games in Rust

A small, explicit game engine for desktop, WebAssembly, iOS, and Android. Start quickly, understand the whole loop, and grow only when your game needs more.

Get started

Play the demo

Small and explicit

A compact lifecycle with clear update and draw steps—easy to learn, debug, and extend.

Core concepts

2D and 3D

Draw images and text, then add GLTF models, animation, instancing, fog, and custom shaders.

Graphics guide

One cross-platform codebase

Build for desktop, the browser with WebAssembly, iOS, and Android from the same Rust project.

Platform support

Ready for AI-assisted work

Stable APIs, focused examples, and a project skill give coding assistants a reliable path to follow.

AI guide

A clear path from idea to playable build

Spottedcat stays deliberately small. The game loop remains visible, the rendering path stays understandable, and the same project can move from a desktop prototype to web and mobile targets.

BuildInput, audio, collision, scoring, restart, and polish.

RenderImages, text, 3D models, animation, fog, and shaders.

ShipDesktop, WebAssembly, iOS, and Android.

Your game is an ordinary Rust type

Implement the Spot lifecycle. Spottedcat handles the window, frame timing, rendering context, and platform layer without hiding the flow of your game.

rust

use spottedcat::{Context, Image, Spot, WindowConfig, run};
use std::time::Duration;

struct Game;

impl Spot for Game {
    fn initialize(_ctx: &mut Context) -> Self {
        Self
    }

    fn update(&mut self, _ctx: &mut Context, _dt: Duration) {
        // Advance game state.
    }

    fn draw(&mut self, _ctx: &mut Context, _screen: Image) {
        // Render the current frame.
    }

    fn remove(&mut self, _ctx: &mut Context) {}
}

fn main() {
    run::<Game>(WindowConfig::default());
}

Choose where to begin

Quick startOpen your first windowSet up a project and run the smallest complete Spottedcat app.Guided buildBuild Flappy CatCreate a complete mini-game with input, collision, score, and restart.ReferenceBrowse runnable examplesStart from focused 2D, 3D, image, input, shader, and WASM code.AI-assistedInstall the builder skillGive Codex stable engine guidance and a proven prototyping workflow.