Castlevania - Bloodlines

Original music:
Enter the options menu. Set 05 as the BGM (background music) and 073 as the SE (sound effects) selections. Press Start to begin game play. The original Castlevania music will begin playing when the standard weapon is powered to level 4. This effect will last until you are hit.

Expert difficulty level:
Press Up(2), Down(2), Left, Right, Left, Right, B, A at the title screen. A sound will confirm correct code entry. Expert difficulty may now be enabled on the options menu.

Bypass regional restriction:
Hold A and power on the system.

Nine lives:
Enable the "Original music" and "Expert difficulty level" codes in that order. A sound will confirm correct code entry.

Super passwords:
The following are the best passwords that can be obtained in the game. Each password results in two continues and nine lives. 

Key
-: Blank
C: Coat of Arms
A: Axe
J: Jewel

John Morris (easy difficulty):

Level 2
A-CA
A--A
AA-A
---A

Level 3
AACC
-CCC
AJA-
J---

Level 4
-AAA
CCCA
J-AC
JAC-

Level 5
A-JJ
A--A
JC-A
--A-

Level 6
ACAA
ACC-
JACA
A--A

John Morris (normal difficulty):

Level 2
AC-J
A-CA
JACA
A-AA

Level 3
-CA-
J-CJ
JJCJ
AAJA

Level 4
-CJ-
JCCJ
--CJ
AA--

Level 5
A-CC
A-C-
-C-A
--A-

Level 6
-CJJ
CCCA
-ACC
CA--

John Morris (expert difficulty):

Level 2
-CAJ
J-AC
-ACJ
AAJ-

Level 3
A-CC
A-CA
-J-A
--C-

Level 4
-CJA
C-A-
C-CC
CAJ-

Level 5
A-AJ
A-CA
CC-A
--A-

Level 6
-AJ-
CCAA
CAAC
JAA-

Eric Lecarde (easy difficulty):

Level 2
-ACC
--CC
AJCJ
AAJ-

Level 3
AC-A
C--J
J-C-
C-A-

Level 4
ACCC
C--J
JCC-
C-AA

Level 5
ACJ-
JCC-
JACA
A---

Level 6
ACAJ
C--J
JJC-
C-JA

Eric Lecarde (normal difficulty):

Level 2
-CC-
--CC
JJ-J
-AC-

Level 3
-CAA
A-CA
--CC
CAAA

Level 4
-ACC
ACA-
-CAC
JAC-

Level 5
-C--
A-CA
-ACC
CAJA

Level 6
AC-C
C-CC
-JC-
C-JA

Eric Lecarde (expert difficulty):

Level 2
-CAA
--CJ
-J-J
-AC-

Level 3
ACJA
C-CJ
C-C-
C-A-

Level 4
-AAJ
ACAA
CCAC
JAC-

Level 5
-AAJ
-CAC
CACJ
AA-A

Level 6
-CAA
ACA-
CJCC
CA--

출처 : http://www.gamewinners.com/GEN/CastlevaniaBloodlines.htm