Welcome to the LEGO Universe technical documentation!


This is a read-the-docs port of the original google docs lu_packet_structs, written by humanoid, lcdr and others, ported by @Xiphoseer. This is currently a proof of concept and is not guaranteed to reflect the latest changes.

The purpose of this documentation is to list and protocol all the information about the network packets of the game LEGO Universe. For organization purposes the contents of the documentation is extended to the following documents:

If any of these documents helped you in some way or another for one of your projects then please credit us and/or include a direct link to this document.


LEGO is in no way affiliated with the content of this and the aforementioned documents. Furthermore the creators of the just mentioned documents are not associated or involved with LEGO.

Contact Info

Most developer activity happens on the LEGO Universe Community Hub (LUCH) discord nowadays. If you join there and ask a question, it’s quite likely someone will be able to help you out.

Devs from all major server projects are active in LUCH.