Just translate ludus from latin to english and you are done.
Btw, tis old. I cant believe people still havent finished it. If you want more of a challenge then try solving
http://notpron.com
I gave up on 16
I dont have time to solve more now
Just a note to anyone who wants to solve the notpron puzzle, you better note down all the url's, usernames and passwords cause you will be needing it