Grargar: And you can blame Google Translate for the single or double t.
Google Translate has nothing to do with it actually ;) This problem is far older then it, heck, even much older then the Internet. Latin is a dead language that is very much alive as somebody said. Hence nobody can be sure of anything. If you try to compare it with other Latin-descending languages you will find that Spanish word for cat is "gato" which may suggest that "catus" is a proper form. If you, however, check Italian it will turn out it's "gatto" which obviously point to "cattus". And since we don't have any native speaking Latin user to ask about it we have no choice but to accept both form. It's even worse with the pronunciation but... I think I'm seriously derailing this thread, sorry for that guys! Good luck with your four games!