Youkai Douchuuki/Hidden content

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This list is incomplete. The following list has been marked as incomplete. If you can, please complete it.

TODO: Hidden graphics (NSFW).

Password screen

On the title screen, press HOLD Ⅰ+Ⅱ+ SELECT  RUN  to access a password entry screen. From here, the following passwords can be entered:

Start from level 5

Enter "S.62.08.22" as a password. Perform a software reset (HOLD  RUN  SELECT ) for the changes to take effect.

Four screen mode + faster speed

Enter "SPEED-UP" as a password. Perform a software reset (HOLD  RUN  SELECT ) for the changes to take effect.

Hidden messages

Fifteen hidden messages can be accessed using these passwords:

PC-ENGINE

NAMCO

NAMCOT

6502

6809

68000

756-2311

YAMASHITA

AKIRA

KOMAI

KAZUHIKO

KAWADA

HAL

NAUSICAA

This password references the Studio Ghibli film Nausicaä of the Valley of the Wind.

LAPUTA

This password references Laputa: Castle in the Sky, another Studio Ghibli film.

Hidden text

Located at the beginning of the ROM:

Copyright 1987  
NAMCO LTD.  All 
Rigths Reserved 
Programmed By...
Haruhisa.Udagawa
 &  Kumi.Hanaoka
1987 8/1 - 11/15