<s>
Metal	B-Application
Gear	I-Application
Acid	I-Application
2	I-Application
,	O
is	O
a	O
turn-based	B-Application
collectible	O
card	O
stealth	O
game	O
developed	O
by	O
Kojima	O
Productions	O
and	O
published	O
by	O
Konami	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
in	O
2005	O
.	O
</s>
<s>
A	O
Java	B-Language
ME	I-Language
version	O
for	O
mobile	O
phones	O
was	O
released	O
by	O
Glu	O
Mobile	O
in	O
2008	B-Application
titled	O
Metal	B-Application
Gear	I-Application
Acid	I-Application
2	I-Application
Mobile	O
.	O
</s>
<s>
Acid	O
2	O
is	O
the	O
sequel	O
to	O
the	O
original	O
Metal	B-Application
Gear	I-Application
Acid	I-Application
,	O
with	O
the	O
story	O
set	O
sometime	O
after	O
the	O
events	O
of	O
the	O
previous	O
game	O
.	O
</s>
<s>
Like	O
its	B-Application
predecessor	I-Application
,	O
it	O
follows	O
an	O
alternate	O
continuity	O
separate	O
from	O
the	O
mainline	O
Metal	B-Application
Gear	I-Application
series	I-Application
.	O
</s>
<s>
It	O
comes	O
with	O
a	O
PSP	B-Operating_System
add-on	O
called	O
the	O
Solid	O
Eye	O
,	O
which	O
is	O
a	O
folding	O
cardboard	O
box	O
with	O
specialized	O
lenses	O
that	O
fit	O
over	O
the	O
PSP	B-Operating_System
's	O
screen	O
,	O
creating	O
a	O
stereoscopic	B-Algorithm
image	I-Algorithm
.	O
</s>
<s>
Gameplay	O
in	O
Metal	B-Application
Gear	I-Application
Acid	I-Application
2	I-Application
is	O
similar	O
to	O
that	O
of	O
its	B-Application
predecessor	I-Application
,	O
using	O
a	O
series	O
of	O
collectible	O
trading	O
cards	O
based	O
on	O
the	O
other	O
Metal	B-Application
Gear	I-Application
games	O
.	O
</s>
<s>
An	O
additional	O
"	O
Solid	O
Eye	O
Theater	O
"	O
mode	O
allows	O
users	O
to	O
watch	O
videos	O
of	O
the	O
Japanese	O
women	O
seen	O
on	O
posters	O
and	O
magazines	O
throughout	O
the	O
Metal	B-Application
Gear	I-Application
series	I-Application
,	O
utilizing	O
the	O
Solid	O
Eye	O
attachment	O
.	O
</s>
<s>
Most	O
cards	O
can	O
move	O
the	O
player	O
three	O
BLKS	O
,	O
but	O
some	O
cards	O
allow	O
more	O
(	O
or	O
less	O
)	O
,	O
and	O
a	O
number	O
of	O
cards	O
are	O
dedicated	O
movement	O
cards	O
,	O
most	O
of	O
which	O
are	O
based	O
on	O
soldiers	O
from	O
the	O
previous	O
Metal	B-Application
Gear	I-Application
games	O
.	O
</s>
<s>
Cards	O
vary	O
drastically	O
:	O
some	O
allow	O
the	O
player	O
to	O
attack	O
(	O
Weapon	O
Cards	O
)	O
,	O
some	O
provide	O
support	O
such	O
as	O
the	O
ability	O
to	O
dodge	O
an	O
attack	O
(	O
Support	O
Cards	O
)	O
,	O
giving	O
the	O
player	O
the	O
ability	O
to	O
perform	O
an	O
action	O
such	O
as	O
the	O
"	O
hold-up	O
"	O
move	O
that	O
incapacitates	O
enemies	O
when	O
the	O
player	O
threatens	O
them	O
from	O
behind	O
or	O
to	O
choke	O
an	O
enemy	O
unconscious	O
(	O
Action	O
Cards	O
)	O
,	O
to	O
use	O
items	O
like	O
rations	O
or	O
body	O
armor	O
(	O
Item	O
Cards	O
)	O
,	O
or	O
special	O
character	O
cards	O
with	O
varying	O
effects	O
based	O
on	O
the	O
characters	O
they	O
represent	O
(	O
either	O
all	O
from	O
Metal	B-Application
Gear	I-Application
games	O
or	O
other	O
Konami	O
games	O
)	O
such	O
as	O
the	O
Sniper	O
Wolf	O
card	O
with	O
gives	O
the	O
player	O
40%	O
more	O
accuracy	O
on	O
equipped	O
weapon	O
for	O
one	O
use	O
(	O
Character	O
Cards	O
)	O
.	O
</s>
<s>
It	O
is	O
a	O
folding	O
cardboard	O
box	O
that	O
slides	O
over	O
the	O
PSP	B-Operating_System
,	O
separating	O
the	O
image	O
with	O
a	O
divider	O
in	O
the	O
center	O
.	O
</s>
<s>
When	O
switched	O
into	O
Solid	O
Eye	O
mode	O
,	O
the	O
game	O
displays	O
two	O
images	O
on	O
either	O
side	O
of	O
the	O
PSP	B-Operating_System
screen	O
.	O
</s>
<s>
These	O
videos	O
are	O
only	O
viewable	O
as	O
Solid	O
Eye	O
footage	O
,	O
and	O
showcase	O
videos	O
of	O
Japanese	O
women	O
as	O
well	O
as	O
cut	O
scenes	O
from	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
3	I-Application
:	I-Application
Snake	I-Application
Eater	I-Application
.	O
</s>
<s>
Acid	O
2	O
is	O
capable	O
of	O
communicating	O
with	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
3	I-Application
:	I-Application
Subsistence	I-Application
for	O
the	O
PlayStation	O
2	O
.	O
</s>
<s>
By	O
connecting	O
a	O
PS2	O
to	O
a	O
PSP	B-Operating_System
,	O
it	O
is	O
possible	O
to	O
take	O
photos	O
in	O
Subsistence	O
and	O
transfer	O
them	O
to	O
a	O
PSP	B-Operating_System
for	O
viewing	O
in	O
3D	O
with	O
the	O
Solid	O
Eye	O
.	O
</s>
<s>
Snake	O
teams	O
with	O
Venus	B-Application
,	O
Wiseman	O
's	O
own	O
operative	O
,	O
and	O
together	O
they	O
search	O
SaintLogic	O
for	O
Koppelthorn	O
.	O
</s>
<s>
Soon	O
after	O
,	O
a	O
test	O
is	O
initiated	O
,	O
and	O
Snake	O
becomes	O
aware	O
that	O
SaintLogic	O
has	O
developed	O
a	O
Metal	B-Application
Gear	I-Application
which	O
Koppelthorn	O
has	O
taken	O
control	O
of	O
.	O
</s>
<s>
General	O
Wiseman	O
constantly	O
comments	O
on	O
a	O
Lucinda	O
File	O
,	O
which	O
he	O
wants	O
Venus	B-Application
to	O
obtain	O
.	O
</s>
<s>
As	O
Snake	O
and	O
Venus	B-Application
search	O
SaintLogic	O
's	O
research	O
facilities	O
,	O
they	O
encounter	O
a	O
researcher	O
,	O
Dr.	O
Takiyama	O
,	O
and	O
a	O
young	O
girl	O
,	O
Lucy	O
,	O
who	O
proceed	O
to	O
join	O
Koppelthorn	O
's	O
scheme	O
.	O
</s>
<s>
Before	O
crossing	O
to	O
the	O
building	O
where	O
Koppelthorn	O
is	O
located	O
,	O
Snake	O
and	O
Venus	B-Application
are	O
met	O
by	O
Metal	B-Application
Gear	I-Application
Kodoque	O
from	O
the	O
first	O
Acid	O
which	O
was	O
rescued	O
before	O
being	O
destroyed	O
during	O
the	O
events	O
of	O
the	O
last	O
game	O
.	O
</s>
<s>
Upon	O
finally	O
meeting	O
with	O
Koppelthorn	O
,	O
Metal	B-Application
Gear	I-Application
Chaioth	O
Ha	O
Qadesh	O
,	O
Lucy	O
,	O
and	O
Dr.	O
Takiyama	O
,	O
Snake	O
and	O
Venus	B-Application
learn	O
that	O
Koppelthorn	O
has	O
been	O
'	O
resurrecting	O
 '	O
his	O
wife	O
in	O
the	O
form	O
of	O
a	O
young	O
girl	O
,	O
Lucy	O
.	O
</s>
<s>
After	O
Snake	O
and	O
Venus	B-Application
defeat	O
Koppelthorn	O
,	O
Lucy	O
reveals	O
herself	O
to	O
not	O
actually	O
be	O
a	O
rebirth	O
of	O
Lucinda	O
Koppelthorn	O
,	O
but	O
rather	O
her	O
own	O
being	O
with	O
the	O
consciousness	O
of	O
Lucinda	O
.	O
</s>
<s>
Lucy	O
kills	O
Tom	O
Koppelthorn	O
and	O
takes	O
control	O
of	O
Metal	B-Application
Gear	I-Application
Chaioth	O
Ha	O
Qadesh	O
acting	O
on	O
her	O
true	O
nature	O
of	O
being	O
test	O
subject	O
designed	O
to	O
kill	O
.	O
</s>
<s>
Snake	O
and	O
Venus	B-Application
must	O
once	O
again	O
defeat	O
Chaioth	O
Ha	O
Qadesh	O
and	O
Lucy	O
as	O
well	O
.	O
</s>
<s>
Snake	O
and	O
Venus	B-Application
next	O
learn	O
that	O
the	O
SaintLogic	O
facility	O
is	O
wired	O
with	O
explosives	O
,	O
and	O
learn	O
the	O
location	O
of	O
Dr.	O
Takiyama	O
as	O
well	O
as	O
the	O
Lucinda	O
File	O
.	O
</s>
<s>
After	O
recovering	O
both	O
,	O
Venus	B-Application
pulls	O
a	O
gun	O
on	O
Snake	O
at	O
Wiseman	O
's	O
command	O
.	O
</s>
<s>
At	O
this	O
time	O
Wiseman	O
was	O
to	O
have	O
Venus	B-Application
work	O
her	O
way	O
through	O
SaintLogic	O
and	O
recover	O
the	O
Lucinda	O
File	O
,	O
and	O
place	O
any	O
blame	O
on	O
Dalton	O
and	O
Snake	O
.	O
</s>
<s>
Venus	B-Application
is	O
then	O
revealed	O
to	O
be	O
a	O
test	O
subject	O
,	O
newer	O
than	O
Snake	O
,	O
who	O
was	O
placed	O
in	O
the	O
care	O
of	O
Wiseman	O
after	O
the	O
activities	O
in	O
Serena	O
.	O
</s>
<s>
Snake	O
learns	O
that	O
Venus	B-Application
was	O
the	O
cause	O
of	O
his	O
amnesia	O
,	O
as	O
she	O
had	O
shot	O
him	O
during	O
the	O
Praulia	O
Massacre	O
.	O
</s>
<s>
Snake	O
and	O
Venus	B-Application
duel	O
and	O
,	O
following	O
Venus	B-Application
's	O
defeat	O
,	O
work	O
their	O
way	O
out	O
of	O
the	O
SaintLogic	O
buildings	O
with	O
Dr.	O
Takiyama	O
.	O
</s>
<s>
Venus	B-Application
and	O
Dr.	O
Takiyama	O
escape	O
however	O
Snake	O
is	O
trapped	O
inside	O
.	O
</s>
<s>
Venus	B-Application
and	O
Takiyama	O
escape	O
the	O
building	O
safely	O
,	O
and	O
outside	O
SaintLogic	O
witness	O
Metal	B-Application
Gear	I-Application
Chaioth	O
Ha	O
Qadesh	O
return	O
to	O
life	O
.	O
</s>
<s>
The	O
U.S.	O
military	O
,	O
which	O
has	O
been	O
called	O
in	O
to	O
secure	O
SaintLogic	O
,	O
fires	O
upon	O
Metal	B-Application
Gear	I-Application
and	O
a	O
missile	O
from	O
its	O
rear	O
launches	O
,	O
and	O
lands	O
in	O
the	O
ocean	O
a	O
short	O
distance	O
away	O
.	O
</s>
<s>
The	O
game	O
ends	O
with	O
Dr.	O
Takiyama	O
and	O
Venus	B-Application
safely	O
recovering	O
from	O
the	O
SaintLogic	O
incident	O
,	O
with	O
General	O
Wiseman	O
arrested	O
and	O
facing	O
charges	O
of	O
war	O
crimes	O
.	O
</s>
<s>
And	O
in	O
a	O
vignette	O
that	O
could	O
have	O
been	O
taken	O
much	O
later	O
after	O
the	O
events	O
of	O
the	O
SaintLogic	O
incident	O
,	O
Venus	B-Application
is	O
seen	O
manning	O
the	O
checkout	O
counter	O
at	O
a	O
supermarket	O
,	O
hinting	O
at	O
her	O
quiet	O
assimilation	O
into	O
everyday	O
life	O
.	O
</s>
<s>
Venus	B-Application
-	O
Female	O
partner	O
to	O
Snake	O
.	O
</s>
<s>
Originally	O
,	O
Wiseman	O
never	O
planned	O
to	O
make	O
his	O
presence	O
or	O
Venus	B-Application
 '	O
presence	O
known	O
to	O
Snake	O
and	O
Dalton	O
.	O
</s>
<s>
Venus	B-Application
is	O
voiced	O
by	O
Kathryn	O
Fiore	O
in	O
English	O
and	O
Rika	O
Komatsu	O
in	O
Japanese	O
.	O
</s>
<s>
He	O
claims	O
to	O
know	O
about	O
Snake	O
's	O
and	O
Venus	B-Application
's	O
past	O
,	O
and	O
offers	O
it	O
in	O
return	O
for	O
their	O
assistance	O
with	O
his	O
operation	O
.	O
</s>
<s>
Although	O
this	O
is	O
Dr.	O
Koppelthorn	O
's	O
first	O
appearance	O
in	O
a	O
Metal	B-Application
Gear	I-Application
game	O
,	O
previous	O
games	O
have	O
referred	O
to	O
the	O
character	O
.	O
</s>
<s>
In	O
Metal	B-Application
Gear	I-Application
:	I-Application
Ghost	I-Application
Babel	I-Application
,	O
Mei	O
Ling	O
attempts	O
to	O
quote	O
from	O
him	O
,	O
only	O
to	O
get	O
interrupted	O
by	O
Snake	O
every	O
time	O
.	O
</s>
<s>
In	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
2	O
:	O
Substance	O
,	O
the	O
Koppelthorn	O
Engine	O
is	O
a	O
VR	O
simulation	O
program	O
that	O
actually	O
serves	O
as	O
a	O
gateway	O
to	O
parallel	O
worlds	O
and	O
is	O
mentioned	O
in	O
one	O
of	O
the	O
Snake	O
Tales	O
,	O
External	O
Gazer	O
.	O
</s>
<s>
was	O
operating	O
out	O
of	O
a	O
small	O
computer	O
lab	O
in	O
St.	O
Crescendo	O
Elementary	O
School	O
,	O
located	O
in	O
the	O
state	O
of	O
Virginia	B-Application
.	O
</s>
<s>
The	O
Western	O
versions	O
include	O
ten	O
new	O
cards	O
not	O
included	O
in	O
the	O
Japanese	O
release	O
,	O
six	O
of	O
which	O
are	O
based	O
on	O
Metal	B-Application
Gear	I-Application
Solid	I-Application
4	I-Application
:	I-Application
Guns	I-Application
of	I-Application
the	I-Application
Patriots	I-Application
:	O
namely	O
Solid	O
Snake	O
,	O
Otacon	O
,	O
Metal	B-Application
Gear	I-Application
Mk	O
.	O
</s>
<s>
The	O
remaining	O
four	O
were	O
fan	O
made	O
submissions	O
selected	O
in	O
a	O
Konami	O
sponsored	O
contest	O
by	O
four	O
online	O
publications	O
(	O
Game	O
Informer	O
,	O
IGN	O
,	O
GameSpy	O
,	O
and	O
1UP.com	O
)	O
,	O
which	O
were	O
an	O
alternate	O
Naked	O
Snake	O
card	O
from	O
MGS3	B-Application
,	O
a	O
Banana	O
Skin	O
,	O
Possessed	O
Arm	O
,	O
and	O
Emma	O
's	O
Parrot	O
.	O
</s>
<s>
It	O
was	O
released	O
along	O
with	O
the	O
Metal	B-Application
Gear	I-Application
Acid	I-Application
soundtrack	O
on	O
December	O
21	O
,	O
2005	O
,	O
in	O
the	O
two-disc	O
compilation	O
Metal	B-Application
Gear	I-Application
Acid	I-Application
1	O
and	O
2	O
Original	O
Soundtrack	O
.	O
</s>
<s>
Metal	B-Application
Gear	I-Application
Acid	I-Application
2	I-Application
received	O
generally	O
positive	O
reviews	O
from	O
critics	O
and	O
the	O
public	O
.	O
</s>
