In the Japanese version of Castelian, Kyoro-Chan Land, you can access the password function by going to the menu by pressing Select at the title screen, then pressing Select again when the cursor is by "Password". Please Note: This function is absent in the US version.

Effect	Password
Broken Path (Tower 5)	GDCT
Edge of Doom (Tower 8)	LGFM
Nasty One (Tower 7)	KWXR
Realm of Robots (Tower 2)	PWHT
Slippery Slide (Tower 4)	NVZR
Swimmers Delight (Tower 6)	XJKD
Trap of Tricks (Tower 3)	JSQB