GOdzilla Daikaiju Battle Royale Help

Well, maybe you are wondering who should really need help in this game, but the situation is this. Whenever I want to play I access to the site:

http://awmerdich.people.ysu.edu/gdbr.html

But I saw some videos in youtube where there are other characters in there like M.O.G.U.E.R.A. 1994 and Minilla, but they do not appear in game. I know the password for all characters is Godzilla´s Birhtday: 1131954, but it seems they need new password. Do you know which password is?