OPEN-SOURCE ENGINE
Under the hood.
This web client uses the xu4 engine, licensed under GNU GPL version 2 or later.
Engine license · Contributors · Web build instructions · Source file list
The corresponding engine source and included engine assets for this build are available at the paths in that list. Original Ultima IV DOS data is not included. The graphics-only VGA overlay is included with original author credits and redistribution terms. This artist-review preview includes four soundtracks; redistribution permissions are pending. Music payloads are not copied into the downloadable source snapshot.