Download 0.5.1 & the nexus2 client from the downloads page, extract them, run the server and then the client. Any username/password will work. 🙂

(You will need Windows for this)
1. Go to luniserver.com/download.
2. At «BlastClient» click on «Direct Download». The client should now start downloading.
3. At «LUNI Server» click on «0.5.1 (Release)». The server should now start downloading.
4. When both folders have been downloaded, unzip them.
5. Go into the folder of the server and open up «LUNIServer.exe».
6. Go into the folder of the client, then click on «client» again.
7. Double-click «legouniverse».
8. The LU login screen should appear. Enter the username «test» and the password «1234».
9. Now you can choose one out of four characters. Each one will bring you to a different world.
10. Enjoy!