Not all Worlds created in LEGO Universe were intended for public release. Developers and LUPs created many worlds throughout the course of development, ranging from personal test worlds to do whatever they wanted, to more extravagant gameplay and art tests. There were also "Game Challenges", which appear to have been internal contests for things such as world design. Due to the massive amount of worlds like this, and that few have been shown publicly, this is not a complete list.