<s>
Darkest	B-Application
of	I-Application
Days	I-Application
is	O
a	O
first-person	O
shooter	O
video	O
game	O
developed	O
by	O
8monkey	O
Labs	O
and	O
published	O
by	O
Phantom	O
EFX	O
.	O
</s>
<s>
Originally	O
released	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
,	O
it	O
was	O
also	O
released	O
for	O
Microsoft	B-Application
Windows	I-Application
via	O
Steam	B-Application
.	O
</s>
<s>
On	O
December	O
30	O
,	O
2010	O
,	O
Virtual	O
Programming	O
published	O
the	O
Mac	B-Application
OS	I-Application
X	I-Application
version	O
of	O
the	O
game	O
.	O
</s>
<s>
In	O
Darkest	B-Application
of	I-Application
Days	I-Application
the	O
player	O
controls	O
Alexander	O
Morris	O
,	O
a	O
soldier	O
fighting	O
in	O
General	O
Custer	O
's	O
battalion	O
during	O
the	O
Battle	O
of	O
Little	O
Big	O
Horn	O
at	O
the	O
beginning	O
of	O
the	O
game	O
.	O
</s>
<s>
Morris	O
then	O
awakens	O
in	O
the	O
headquarters	O
of	O
Kronotek	B-Application
,	O
an	O
organization	O
that	O
has	O
managed	O
to	O
develop	O
time	O
travel	O
technology	O
and	O
is	O
apparently	O
dedicated	O
to	O
researching	O
and	O
protecting	O
history	O
.	O
</s>
<s>
A	O
Kronotek	B-Application
higher-up	O
known	O
as	O
"	O
Mother	O
"	O
tells	O
Morris	O
that	O
Doctor	O
Koell	O
,	O
the	O
organization	O
's	O
founder	O
,	O
has	O
gone	O
missing	O
and	O
disturbances	O
have	O
started	O
appearing	O
through	O
history	O
,	O
causing	O
individuals	O
that	O
have	O
played	O
key	O
roles	O
in	O
history	O
to	O
be	O
placed	O
in	O
danger	O
,	O
and	O
tasks	O
Morris	O
with	O
helping	O
Kronotek	B-Application
restore	O
history	O
.	O
</s>
<s>
Upon	O
completion	O
of	O
his	O
training	O
Mother	O
tasks	O
Morris	O
and	O
Dexter	O
with	O
tracking	O
down	O
two	O
individuals	O
who	O
are	O
not	O
where	O
they	O
are	O
supposed	O
to	O
be	O
:	O
one	O
Corporal	O
Welsh	O
from	O
the	O
Union	O
Army	O
in	O
the	O
American	O
Civil	O
War	O
at	O
the	O
Battle	B-Application
of	I-Application
Antietam	I-Application
,	O
and	O
a	O
Russian	O
Army	O
Officer	O
named	O
Petrovich	O
in	O
World	O
War	O
I	O
at	O
the	O
Battle	O
of	O
Tannenberg	O
.	O
</s>
<s>
Over	O
the	O
course	O
of	O
the	O
game	O
,	O
Morris	O
and	O
Dexter	O
have	O
to	O
fight	O
through	O
both	O
the	O
Battle	B-Application
of	I-Application
Antietam	I-Application
and	O
the	O
Battle	O
of	O
Tannenberg	O
,	O
which	O
involve	O
massive	O
cornfield	O
battles	O
,	O
the	O
dynamiting	O
of	O
a	O
train	O
bridge	O
,	O
and	O
the	O
hijacking	O
of	O
a	O
zeppelin	B-Application
.	O
</s>
<s>
(	O
It	O
later	O
transpires	O
that	O
the	O
Opposition	O
is	O
a	O
future	O
version	O
of	O
Kronotek	B-Application
)	O
.	O
</s>
<s>
Although	O
he	O
makes	O
clear	O
that	O
Kronotek	B-Application
's	O
ultimate	O
goal	O
is	O
still	O
the	O
preservation	O
of	O
the	O
time	O
stream	O
,	O
he	O
indicates	O
that	O
this	O
one	O
exception	O
was	O
made	O
.	O
</s>
<s>
The	O
strange	O
man	O
then	O
says	O
that	O
his	O
Kronotek	B-Application
has	O
use	O
for	O
talented	O
agents	O
such	O
as	O
Morris	O
and	O
Dexter	O
and	O
invites	O
them	O
to	O
join	O
his	O
agency	O
,	O
leaving	O
an	O
open	O
time	O
bubble	O
for	O
them	O
to	O
enter	O
.	O
</s>
<s>
Since	O
the	O
premise	O
of	O
Darkest	B-Application
of	I-Application
Days	I-Application
leans	O
heavily	O
on	O
the	O
historical	O
aspect	O
of	O
its	O
story	O
,	O
the	O
developers	O
focused	O
on	O
making	O
the	O
battles	O
as	O
historically	O
accurate	O
as	O
possible	O
.	O
</s>
<s>
Darkest	B-Application
of	I-Application
Days	I-Application
uses	O
NVIDIA	B-Operating_System
PhysX	I-Operating_System
,	O
a	O
hardware-accelerated	O
physics	O
engine	O
.	O
</s>
<s>
"	O
It	O
was	O
critical	O
to	O
the	O
success	O
of	O
Darkest	B-Application
of	I-Application
Days	I-Application
that	O
these	O
epic	O
moments	O
in	O
world	O
history	O
are	O
experienced	O
in	O
eerily	O
accurate	O
detail	O
,	O
and	O
NVIDIA	B-Operating_System
PhysX	I-Operating_System
technology	O
helped	O
us	O
achieve	O
that	O
goal	O
,	O
"	O
said	O
Mark	O
Doeden	O
,	O
Art	O
Director	O
at	O
8monkey	O
Labs	O
.	O
</s>
<s>
"	O
Our	O
Marmoset	O
Engine	O
brings	O
these	O
battles	O
to	O
life	O
with	O
a	O
completely	O
unique	O
look	O
,	O
and	O
the	O
PhysX	B-Operating_System
technology	O
was	O
instrumental	O
in	O
making	O
the	O
game	O
feel	O
alive	O
and	O
real.	O
"	O
</s>
<s>
Darkest	B-Application
of	I-Application
Days	I-Application
also	O
contains	O
wide	O
open	O
battlefields	O
,	O
allowing	O
players	O
to	O
choose	O
their	O
own	O
course	O
of	O
action	O
to	O
accomplish	O
the	O
goals	O
set	O
in	O
the	O
game	O
(	O
however	O
,	O
there	O
are	O
numerous	O
limitations	O
imposed	O
on	O
a	O
player	O
's	O
movements	O
throughout	O
a	O
map	O
via	O
obstacles	O
and	O
invisible	O
walls	O
)	O
.	O
</s>
<s>
The	O
PC	O
version	O
received	O
"	O
mixed	O
"	O
reviews	O
,	O
while	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
received	O
"	O
generally	O
unfavorable	O
reviews	O
"	O
,	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
<s>
However	O
,	O
PC	O
Gamer	O
UK	O
said	O
that	O
"	O
Darkest	B-Application
of	I-Application
Days	I-Application
is	O
a	O
unique	O
first	O
person	O
shooter	O
"	O
.	O
</s>
<s>
Positive	O
reviews	O
also	O
came	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
;	O
Digital	O
Chumps	O
said	O
it	O
provided	O
a	O
"	O
unique	O
and	O
overall	O
well	O
put	O
together	O
single	O
player	O
campaign	O
.	O
</s>
