What do you need passcodes for? IMO passcodes make a game to boring because once you have them you cant help but use them.
"Im not afraid." Luke
" You will be, You will be." Yoda
"Strike me down and I'll become more powerfull than you can possibly imagine. " - Obi Wan Kenobi
"He is to old, to old to begin the training." - Yoda
"I am your Father." - Vader
"NOOOOOOOOO!!" - Luke