The GodotUO emblem: a silver and gold sigil

GodotUO

Classic Ultima Online on Godot 4 .NET. One repository to build, play and manage your client on the desktop, on your phone and on your Steam Deck.

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The gardens of Castle British, drawn by GodotUO on a local ModernUO shard
Castle British in GodotUO, on a local ModernUO shard.

What it is

GodotUO carries ClassicUO's C# across to Godot: the network stack, the file readers and the game logic as they are, with only the renderer, input and audio rebuilt on the engine. The aim is identical behaviour first and improvements second.

You bring your own Ultima Online install. No game data is in the repository or in any build. The client reads your install in place and never writes to it.

Platforms

Windows

plays

launchers\game\play.bat, or a build from the release workflow.

Android

debug build

Touch controls, centred screens, soft keyboard and dual-screen devices. Android build

Steam Deck

reaches login

Export, install over ssh and a Steam shortcut, from one launcher folder.

Godot editor

tooling

Browse the UO data, edit the world and export it to your shard. Editor

Web

blocked upstream

Godot 4.7 cannot export C# to the web yet; the pipeline is ready for when it can.

Start in four steps

launchers\pipeline\00_bootstrap.bat          fetch the pinned engine and upstream
copy launchers\_shared\config.local.bat.example launchers\_shared\config.local.bat
launchers\dev\smoke.bat                      check that everything resolves
launchers\game\play.bat                      play

Set UO_CLIENT_DATA to your install in config.local.bat. The client connects to 127.0.0.1:2593 unless you set UO_SHARD_HOST. See the dev shard for a local server to play on.

Learn more

Architecture

How the port is split into verbatim, shim and rewrite tiers.

Configuration

Every setting, and the order they resolve in.

Launchers and tools

One folder per job, one obvious launcher.

FAQ

Data, shards, licences and what "ported" means.