<s>
Steel	B-Device
Diver	I-Device
is	O
a	O
submarine	O
simulation	O
video	O
game	O
developed	O
and	O
published	O
by	O
Nintendo	O
,	O
with	O
assistance	O
by	O
Vitei	O
,	O
for	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
.	O
</s>
<s>
The	O
game	O
was	O
released	O
in	O
March	O
2011	O
as	O
a	O
launch	O
title	O
for	O
the	O
3DS	B-Operating_System
in	O
North	O
America	O
,	O
with	O
releases	O
in	O
Europe	O
,	O
Australia	O
,	O
and	O
Japan	O
,	O
coming	O
in	O
May	O
the	O
same	O
year	O
.	O
</s>
<s>
Steel	B-Device
Diver	I-Device
received	O
generally	O
mixed	O
reviews	O
from	O
critics	O
.	O
</s>
<s>
A	O
sequel	O
,	O
Steel	B-Device
Diver	I-Device
:	O
Sub	O
Wars	O
,	O
was	O
released	O
in	O
2014	O
via	O
the	O
Nintendo	O
eShop	O
.	O
</s>
<s>
A	O
secret	O
organization	O
known	O
as	O
the	O
'	O
Steel	B-Device
Divers	I-Device
 '	O
was	O
formed	O
from	O
various	O
countries	O
 '	O
navies	O
to	O
combat	O
this	O
threat	O
.	O
</s>
<s>
The	O
Steel	B-Device
Divers	I-Device
travel	O
through	O
various	O
areas	O
including	O
Arctic	O
and	O
jungle	B-Device
settings	O
and	O
are	O
eventually	O
tasked	O
with	O
destroying	O
the	O
enemy	O
stronghold	O
.	O
</s>
<s>
In	O
the	O
last	O
mission	O
of	O
the	O
original	O
Steel	B-Device
Diver	I-Device
,	O
the	O
final	O
boss	O
of	O
the	O
game	O
was	O
the	O
Giant	O
Z-Class	O
submarine	O
.	O
</s>
<s>
This	O
sub	O
also	O
appears	O
in	O
the	O
sequel	O
Steel	B-Device
Diver	I-Device
:	O
Sub	O
Wars	O
,	O
as	O
a	O
submarine	O
purchasable	O
in	O
the	O
online	O
shop	O
.	O
</s>
<s>
Steel	B-Device
Diver	I-Device
consists	O
of	O
3	O
main	O
modes	O
:	O
Missions	O
,	O
Periscope	B-Language
Strike	O
,	O
and	O
Steel	O
Commander	O
.	O
</s>
<s>
In	O
Campaign	O
,	O
the	O
player	O
uses	O
sliders	O
and	O
dials	O
on	O
the	O
touchscreen	O
to	O
manoeuver	O
a	O
submarine	O
through	O
side-scrolling	O
levels	O
displayed	O
on	O
the	O
top	O
screen	O
,	O
sinking	O
enemy	O
submarines	O
,	O
battleships	B-Application
and	O
avoiding	O
naval	O
mines	O
and	O
depth	B-Device
charges	I-Device
as	O
required	O
.	O
</s>
<s>
Periscope	B-Language
Strike	O
mode	O
is	O
played	O
after	O
every	O
successful	O
mission	O
or	O
can	O
also	O
be	O
played	O
separately	O
,	O
or	O
as	O
part	O
of	O
Steel	O
Commander	O
.	O
</s>
<s>
This	O
mode	O
sees	O
the	O
player	O
moving	O
the	O
system	O
to	O
rotate	O
a	O
periscope	B-Language
to	O
fire	O
torpedoes	O
at	O
enemy	O
ships	O
.	O
</s>
<s>
It	O
is	O
a	O
strategy	O
game	O
in	O
which	O
the	O
two	O
players	O
command	O
a	O
fleet	O
of	O
battleships	B-Application
and	O
submarines	O
and	O
try	O
to	O
sink	O
each	O
other	O
's	O
fleet	O
.	O
</s>
<s>
At	O
E3	O
2004	O
,	O
Steel	B-Device
Diver	I-Device
was	O
first	O
shown	O
as	O
a	O
playable	O
tech	O
demo	O
for	O
the	O
then-upcoming	O
Nintendo	B-Device
DS	I-Device
.	O
</s>
<s>
The	O
concept	O
of	O
a	O
sub	O
game	O
,	O
however	O
,	O
was	O
,	O
according	O
to	O
Shigeru	O
Miyamoto	O
"	O
Long	O
before	O
that	O
"	O
and	O
stems	O
from	O
his	O
desire	O
to	O
make	O
a	O
flight	B-Application
sim	I-Application
.	O
</s>
<s>
Even	O
though	O
he	O
had	O
created	O
Pilotwings	B-Application
which	O
has	O
some	O
similar	O
aspects	O
to	O
the	O
genre	O
,	O
Miyamoto	O
was	O
not	O
fully	O
satisfied	O
with	O
its	O
simulation	O
aspects	O
.	O
</s>
<s>
He	O
noted	O
that	O
a	O
true	O
flight	B-Application
simulator	I-Application
players	O
"	O
should	O
be	O
flying	O
a	O
huge	O
passenger	O
aircraft	O
instead	O
of	O
,	O
say	O
,	O
a	O
fighter	O
jet.	O
"	O
</s>
<s>
He	O
had	O
considered	O
developing	O
the	O
game	O
for	O
a	O
system	O
before	O
the	O
Nintendo	B-Device
DS	I-Device
,	O
but	O
soon	O
realized	O
that	O
the	O
control	O
system	O
for	O
such	O
a	O
game	O
would	O
be	O
less	O
than	O
ideal	O
.	O
</s>
<s>
Even	O
though	O
the	O
tech	O
demo	O
at	O
E3	O
2004	O
had	O
good	O
buzz	O
Miyamoto	O
was	O
unable	O
to	O
expand	O
on	O
the	O
idea	O
until	O
late	O
in	O
the	O
DS	B-Device
's	O
life	O
due	O
to	O
scheduling	O
conflict	O
.	O
</s>
<s>
When	O
a	O
team	O
was	O
finally	O
able	O
to	O
be	O
allocated	O
to	O
the	O
project	O
the	O
3DS	B-Operating_System
specifications	O
became	O
known	O
to	O
him	O
at	O
which	O
point	O
he	O
felt	O
the	O
game	O
would	O
work	O
better	O
as	O
a	O
3DS	B-Operating_System
title	O
.	O
</s>
<s>
Six	O
years	O
after	O
the	O
DS	B-Device
demo	O
Nintendo	O
revealed	O
the	O
game	O
at	O
E3	O
2010	O
,	O
as	O
a	O
launch	O
title	O
for	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
.	O
</s>
<s>
It	O
was	O
released	O
in	O
North	O
America	O
on	O
March	O
27	O
,	O
2011	O
,	O
where	O
it	O
was	O
one	O
of	O
the	O
first	O
games	O
for	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
.	O
</s>
<s>
In	O
June	O
2013	O
,	O
it	O
was	O
announced	O
that	O
Nintendo	O
was	O
working	O
on	O
their	O
first	O
free-to-play	O
game	O
,	O
which	O
would	O
be	O
based	O
on	O
Steel	B-Device
Diver	I-Device
,	O
to	O
be	O
released	O
by	O
March	O
2014	O
.	O
</s>
<s>
This	O
was	O
ultimately	O
revealed	O
to	O
be	O
titled	O
Steel	B-Device
Diver	I-Device
:	O
Sub	O
Wars	O
during	O
the	O
Nintendo	O
Direct	O
on	O
February	O
13	O
,	O
2014	O
,	O
which	O
released	O
after	O
the	O
event	O
for	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
.	O
</s>
<s>
Sub	O
Wars	O
is	O
a	O
first-person	O
game	O
featuring	O
a	O
free-to-play	O
online	B-Application
multiplayer	I-Application
mode	O
and	O
two	O
levels	O
of	O
the	O
single	O
player	O
campaign	O
,	O
with	O
additional	O
features	O
and	O
missions	O
available	O
to	O
the	O
paid	O
version	O
.	O
</s>
<s>
Steel	B-Device
Diver	I-Device
has	O
received	O
mixed	O
reviews	O
.	O
</s>
<s>
IGN	O
's	O
Audrey	O
Drake	O
gave	O
Steel	B-Device
Diver	I-Device
a	O
7	O
out	O
of	O
10	O
,	O
praising	O
it	O
for	O
its	O
addictive	O
gameplay	O
,	O
but	O
gave	O
caution	O
that	O
the	O
slow-paced	O
strategy	O
is	O
not	O
for	O
everyone	O
.	O
</s>
<s>
GameSpot	O
awarded	O
it	O
a	O
score	O
of	O
4.5	O
out	O
of	O
10	O
,	O
saying	O
"	O
Steel	B-Device
Diver	I-Device
never	O
figures	O
out	O
if	O
it	O
wants	O
to	O
be	O
a	O
submarine	O
simulation	O
or	O
an	O
action	O
romp	O
,	O
and	O
that	O
indecision	O
leads	O
to	O
a	O
yawn-inducing	O
experience.	O
"	O
</s>
