<s>
Darkest	B-Application
Hour	I-Application
:	I-Application
A	I-Application
Hearts	I-Application
of	I-Application
Iron	I-Application
Game	I-Application
is	O
a	O
grand	O
strategy	O
wargame	O
that	O
is	O
based	O
on	O
Paradox	O
Interactive	O
's	O
Europa	B-Application
Engine	I-Application
.	O
</s>
<s>
In	O
Darkest	B-Application
Hour	I-Application
,	O
as	O
is	O
the	O
case	O
with	O
other	O
Hearts	B-Application
of	I-Application
Iron	I-Application
titles	O
,	O
the	O
player	O
can	O
take	O
control	O
of	O
almost	O
any	O
country	O
that	O
existed	O
in	O
the	O
game	O
's	O
timeframe	O
,	O
which	O
spans	O
from	O
1914-1920	O
or	O
1933	O
–	O
1964	O
depending	O
on	O
the	O
scenario	O
.	O
</s>
<s>
Darkest	B-Application
Hour	I-Application
is	O
,	O
at	O
its	O
core	O
,	O
an	O
evolution	O
of	O
Hearts	B-Application
of	I-Application
Iron	I-Application
II	I-Application
:	O
Armageddon	O
.	O
</s>
<s>
This	O
has	O
been	O
considered	O
crucial	O
by	O
the	O
development	O
team	O
to	O
make	O
it	O
easy	O
to	O
port	O
community-made	O
modifications	O
from	O
Hearts	B-Application
of	I-Application
Iron	I-Application
II	I-Application
to	O
Darkest	B-Application
Hour	I-Application
.	O
</s>
<s>
Moreover	O
,	O
the	O
most	O
important	O
changes	O
to	O
the	O
engines	O
have	O
been	O
added	O
as	O
mods	O
to	O
the	O
core	O
game	O
,	O
with	O
the	O
name	O
Darkest	B-Application
Hour	I-Application
Light	O
and	O
Darkest	B-Application
Hour	I-Application
Full	O
:	O
</s>
<s>
Darkest	B-Application
Hour	I-Application
(	O
core	O
game	O
)	O
:	O
this	O
version	O
is	O
focused	O
on	O
compatibility	O
with	O
Hearts	B-Application
of	I-Application
Iron	I-Application
2	I-Application
Armageddon	O
and	O
all	O
mods	O
available	O
for	O
it	O
.	O
</s>
<s>
Darkest	B-Application
Hour	I-Application
Light	O
:	O
this	O
version	O
is	O
available	O
as	O
a	O
mod	O
with	O
only	O
a	O
few	O
changes	O
from	O
HOI2	B-Application
,	O
but	O
nearly	O
all	O
new	O
features	O
are	O
enabled	O
.	O
</s>
<s>
Darkest	B-Application
Hour	I-Application
Full	O
:	O
this	O
version	O
is	O
available	O
as	O
a	O
mod	O
without	O
any	O
compatibility	O
with	O
HOI2	B-Application
and	O
implements	O
or	O
reworks	O
many	O
new	O
features	O
,	O
the	O
most	O
visible	O
difference	O
being	O
the	O
new	O
map	O
and	O
research	O
system	O
.	O
</s>
<s>
Darkest	B-Application
Hour	I-Application
Full	O
provides	O
different	O
grand	O
campaign	O
scenarios	O
(	O
where	O
it	O
is	O
possible	O
to	O
choose	O
any	O
of	O
the	O
nations	O
involved	O
)	O
or	O
battle	O
scenarios	O
(	O
focused	O
on	O
single	O
theaters	O
of	O
operations	O
,	O
with	O
only	O
a	O
few	O
nations	O
involved	O
and	O
playable	O
)	O
.	O
</s>
<s>
The	O
1.02	O
patch	O
,	O
released	O
on	O
November	O
11	O
,	O
2011	O
added	O
four	O
new	O
grand	O
campaign	O
scenarios	O
and	O
new	O
functionalities	O
(	O
infantry	O
units	O
can	O
now	O
have	O
two	O
brigades	B-Application
and	O
it	O
is	O
possible	O
to	O
upgrade	O
a	O
unit	O
to	O
a	O
different	O
model	O
,	O
for	O
example	O
,	O
a	O
simple	O
infantry	O
unit	O
can	O
be	O
upgraded	O
to	O
a	O
motorized	O
unit	O
)	O
.	O
</s>
<s>
Darkest	B-Application
Hour	I-Application
was	O
first	O
announced	O
on	O
September	O
14	O
,	O
2010	O
,	O
by	O
Paradox	O
Interactive	O
.	O
</s>
<s>
The	O
game	O
became	O
possible	O
due	O
to	O
Paradox	O
licensing	O
its	O
Europa	B-Application
Engine	I-Application
,	O
in	O
2008	O
,	O
to	O
independent	O
developers	O
.	O
</s>
<s>
The	O
Iron	O
Cross	O
expansion	O
for	O
Hearts	B-Application
of	I-Application
Iron	I-Application
II	I-Application
and	O
Arsenal	B-Application
of	I-Application
Democracy	I-Application
:	I-Application
A	I-Application
Hearts	I-Application
of	I-Application
Iron	I-Application
Game	I-Application
is	O
also	O
compatible	O
with	O
Darkest	B-Application
Hour	I-Application
.	O
</s>
<s>
Many	O
mods	O
designed	O
for	O
Hearts	B-Application
of	I-Application
Iron	I-Application
II	I-Application
:	O
Armageddon	O
were	O
also	O
converted	O
to	O
Darkest	B-Application
Hour	I-Application
.	O
</s>
<s>
The	O
most	O
popular	O
of	O
these	O
mods	O
are	O
:	O
Kaiserreich	O
(	O
alternate	O
history	O
where	O
Central	O
Powers	O
won	O
World	O
War	O
I	O
)	O
,	O
the	O
Total	O
Realism	O
Project	O
Mod	O
(	O
Historical	O
challenge	O
mod	O
for	O
single	O
and	O
multiplayer	O
)	O
,	O
the	O
Fallout	B-Application
Mod	O
Fallout	B-Application
's	O
Doomsday	O
(	O
set	O
in	O
the	O
world	O
of	O
Fallout	B-Application
games	I-Application
)	O
,	O
and	O
Mod33	O
(	O
rework	O
of	O
the	O
game	O
,	O
beginning	O
in	O
1933	O
)	O
.	O
</s>
<s>
The	O
New	O
World	O
Order	O
mod	O
allows	O
users	O
to	O
play	O
up	O
to	O
1991	O
and	O
focuses	O
on	O
the	O
Cold	B-Application
War	I-Application
between	O
the	O
US	O
and	O
USSR	O
.	O
</s>
<s>
Similarly	O
,	O
the	O
Fatherland	O
Mod	O
features	O
an	O
alternate	O
timeline	O
where	O
Germany	O
has	O
won	O
WWII	O
and	O
fights	O
a	O
Cold	B-Application
War	I-Application
against	O
the	O
USA	O
.	O
</s>
<s>
There	O
were	O
also	O
plans	O
to	O
integrate	O
the	O
mod	O
into	O
the	O
main	O
Darkest	B-Application
Hour	I-Application
game	O
in	O
future	O
patches	O
.	O
</s>
