<s>
is	O
an	O
action-adventure	O
platform	O
video	O
game	O
released	O
by	O
Konami	O
in	O
1986	O
,	O
and	O
a	O
sequel	O
to	O
1983	O
's	O
Antarctic	B-Application
Adventure	I-Application
.	O
</s>
<s>
This	O
title	O
significantly	O
expanded	O
upon	O
the	O
gameplay	O
of	O
Antarctic	B-Application
Adventure	I-Application
by	O
most	O
notably	O
adding	O
a	O
greater	O
variety	O
of	O
stages	O
and	O
enemies	O
and	O
RPG	O
elements	O
:	O
boss	O
fights	O
,	O
purchasable	O
items	O
,	O
and	O
several	O
mini-games	O
.	O
</s>
<s>
Level	O
design	O
and	O
variety	O
have	O
increased	O
from	O
Antarctic	B-Application
Adventure	I-Application
;	O
there	O
are	O
forest	O
levels	O
,	O
ice	O
levels	O
,	O
water-based	O
levels	O
,	O
caves	O
,	O
and	O
even	O
some	O
outer-space	O
bonus	O
levels	O
.	O
</s>
<s>
In	O
the	O
bad	O
ending	O
,	O
the	O
princess	O
dies	O
,	O
while	O
in	O
the	O
good	O
ending	O
,	O
she	O
lives	O
,	O
an	O
idea	O
that	O
Kojima	O
would	O
later	O
use	O
again	O
in	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
and	O
,	O
to	O
an	O
extent	O
,	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
2	I-Application
:	I-Application
Sons	I-Application
of	I-Application
Liberty	I-Application
.	O
</s>
<s>
The	O
MSX	B-Operating_System
version	O
was	O
re-released	O
on	O
several	O
platforms	O
during	O
the	O
years	O
:	O
first	O
on	O
PlayStation	B-Device
and	O
Sega	B-Device
Saturn	I-Device
as	O
part	O
of	O
Konami	B-Application
Antiques	I-Application
MSX	I-Application
Collection	I-Application
in	O
1997/1999	O
,	O
then	O
on	O
Virtual	B-Application
Console	I-Application
(	O
first	O
for	O
Wii	B-Operating_System
on	O
November	O
24	O
,	O
2009	O
,	O
later	O
for	O
Wii	B-Device
U	I-Device
on	O
January	O
29	O
,	O
2014	O
)	O
in	O
Japan	O
,	O
and	O
finally	O
on	O
PC	B-Device
on	O
April	O
11	O
,	O
2014	O
always	O
in	O
Japan	O
(	O
as	O
Project	O
EGG	O
)	O
.	O
</s>
<s>
In	O
2006	O
,	O
Konami	O
Digital	O
Entertainment	O
Tokyo	O
serialized	O
a	O
series	O
of	O
digital	O
comics	O
based	O
on	O
the	O
video	O
game	O
of	O
the	O
same	B-Application
name	I-Application
titled	O
.	O
</s>
