<s>
Penumbra	B-Application
:	I-Application
Black	I-Application
Plague	I-Application
is	O
the	O
second	O
installment	O
of	O
the	O
Penumbra	O
series	O
of	O
episodic	O
video	O
games	O
developed	O
by	O
Frictional	O
Games	O
.	O
</s>
<s>
The	O
story	O
continues	O
from	O
the	O
previous	O
episode	O
,	O
Penumbra	B-Application
:	I-Application
Overture	I-Application
,	O
showing	O
the	O
protagonist	O
Philip	O
moving	O
away	O
from	O
the	O
abandoned	O
mine	O
setting	O
of	O
the	O
original	O
to	O
explore	O
an	O
underground	O
research	O
base	O
.	O
</s>
<s>
Although	O
originally	O
intended	O
to	O
conclude	O
the	O
series	O
,	O
a	O
further	O
expansion	O
called	O
Penumbra	B-Application
:	I-Application
Requiem	I-Application
was	O
released	O
later	O
that	O
year	O
.	O
</s>
<s>
A	O
notebook	B-Device
kept	O
by	O
the	O
protagonist	O
helps	O
keep	O
this	O
information	O
in	O
order	O
and	O
lists	O
the	O
player	O
's	O
current	O
objectives	O
.	O
</s>
<s>
The	O
base	O
is	O
abandoned	O
and	O
in	O
ruins	O
,	O
with	O
all	O
its	O
personnel	O
either	O
dead	O
or	O
transformed	O
into	O
"	O
the	O
Infected	O
"	O
,	O
zombie-like	O
creatures	O
that	O
attack	O
Philip	O
when	O
they	O
notice	O
him	O
.	O
</s>
<s>
First	O
intended	O
as	O
a	O
trilogy	O
,	O
the	O
series	O
was	O
reduced	O
to	O
two	O
episodes	O
due	O
to	O
unidentified	O
problems	O
with	O
the	O
previous	O
publisher	O
,	O
Lexicon	O
Entertainment	O
,	O
with	O
the	O
announcement	O
of	O
Penumbra	B-Application
:	I-Application
Black	I-Application
Plague	I-Application
.	O
</s>
<s>
Frictional	O
Games	O
later	O
announced	O
that	O
Black	O
Plague	O
was	O
to	O
receive	O
an	O
expansion	O
named	O
Requiem	B-Application
,	O
which	O
was	O
released	O
in	O
August	O
2008	O
.	O
</s>
<s>
Black	O
Plague	O
received	O
"	O
generally	O
favourable	O
reviews	O
"	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
<s>
Penumbra	B-Application
:	I-Application
Black	I-Application
Plague	I-Application
was	O
nominated	O
for	O
a	O
Writers	O
 '	O
Guild	O
of	O
Great	O
Britain	O
Award	O
in	O
2008	O
for	O
Best	O
Video	O
Game	O
Script	O
.	O
</s>
