I've been trying to find a scan of the game's instructional booklet to verify, but I remember that in the book there was a couple passwords demonstrating the save system. One of these unlocked a minigame, I think it was blackjack.
I've checked all of the cheat sites and scoured through game manual databases, yet have come up with nothing. I gave up the search a couple years ago after I picked up a loose disc copy of the game at a local gameshop. It came up in conversation the other day so I started looking again and found this site with some users claiming to own a copy of the booklet.
I'm dying to put this mystery to rest, so any help would be much appreciated.