Code:
Passwords

GDBF YLFV HZJS ZHCS     Stage 1
HDDM NTKB HQLF XKLD     Stage 2
VWNP XSQX CGBH BPJP     Stage 3
DKHH UMBH CSWN KMMQ     Stage 4
YZHF MMXK VJDR GMWQ     Stage 5
PBGX RVNG KGKX WRZB     Stage 6
FDQP QRMB FGNH GTKL     Play as the Ultimate Gargoyle

For there to be no enemies except for Bosses, at the password 
screen enter RBNL, XHGB, VGBB, BLYLD and then 
go to the end and press start.

To warp to the end of the game with all of the items collected 
and to see the best ending, type in the following code:
YDGM
QRMB
FGJB
JTZB

RBNL
XHGB     There will be no enemies, just bosses. 
VGBB
LYLD

PDQM
RRMV     All items.
FWGX
DTSG

QFFF
KNRR     4th ending.
DDLR
XGTQ