Demon's Crest

No enemies:
Enter RBNL XHGB VGBB LYLD as a password. Only Bosses will appear in the game. Note, levels 5 and 6 will not appear with this code.

All items:
Enter QFFF KNRR DDLR XGTQ as a password.

Play as Ultimate Gargoyle:
Enter FDQP QRMB FGNH GTKL as a password.

Super passwords:
Enter KDGY KRMV DDXR XWKQ as a password for every crest, fire power, potions, Gargoyles, and talisman.

Enter TDGM JRMB DBWB ZWSB as a password for all items, the ability to fight Phalanx in final form, and can fight Dark Demon.

Enter ZVHW FBBR VKZS TVTS as a password for the dragon defeated, the first Crest, and the first Urn.

Enter YDQM RRMC FJGL DTSG as a passwords for all power-ups, items, and life extensions before fighting Phalanx.

Bad ending:
Enter CDDZ GSHL FTGL FPMR as a password.

Have all five vials:
Hold A at the title screen and keep that button held while pressing Start to begin a new game. Note: Passwords and options may not be used.

Hint: Easy boss battles:
On most level Bosses (except big ones like Arma), after you do enough damage to them, using a death spell will then kill them. You have to do this after doing a lot of damage. However, it will not deliver an instant kill as soon as you see them.