Recursive AI
Game engineC#Available

onegame

A C#-native game engine with no editor: a game is plain C# plus text assets. Build, run, test, capture and replay it from a terminal.

dotnet tool install -g RecursiveAI.OneGame.Cli
Getting started Docs Cookbook Articles GitHub NuGet

A quick look

One class holds an entity’s synced state, its commands, its deterministic simulation and its view. The generator writes the change tracking, codecs, deltas and snapshots; the analyzers turn the rules into compile errors.

Your first game, line by line
Counter.csC#
[Entity]
public partial class Counter : Entity
{
    [Synced] public partial int Count { get; private set; }
    [Synced] public partial int Ticks { get; private set; }
 
    [Command]
    public void Increment(int by) => Count += by;
 
    protected override void OnTick() => Ticks++;
 
    // View code reads state and never writes it.
    [View]
    public string Label() => $"Count: {Count}";
}
What it does

Rules enforced at build time

Entities, sync, rendering and UI are generated or checked by Roslyn source generators and analyzers. Warnings are errors, and every shipping project is AOT- and trim-checked.

Sync built in

Clients and servers run the same stack, so state syncs between processes, with prediction, authority transfer and drift detection.

Driven from a terminal

A command line, a C# test API and a live-control protocol (MCP) build, run, inspect, capture and replay games, with scenarios as tests.

Runs where players are

Windows, Linux (X11, Wayland and the Steam Deck), macOS, Android, iOS and the web through WebGPU. Everything is NativeAOT- and trim-clean.

From a terminal

New, run, test, export

You need the .NET 10 SDK and nothing else. onegame new writes a project on the RecursiveAI.OneGame.Sdk MSBuild SDK, which brings the engine from nuget.org at the same version as the tool.

Scenarios, replays and live control
Terminalsh
dotnet tool install -g RecursiveAI.OneGame.Cli
onegame new mygame
cd mygame
onegame run --headless --frames 60 --json
onegame test --json
onegame export --target linux

The packages

Go further

GitHub NuGet Your first game Driving a game UI guide Exporting Devices Changelog