<s>
Penumbra	B-Application
:	I-Application
Requiem	I-Application
is	O
an	O
expansion	O
pack	O
to	O
the	O
game	O
Penumbra	B-Application
:	I-Application
Black	I-Application
Plague	I-Application
developed	O
by	O
Frictional	O
Games	O
.	O
</s>
<s>
With	O
the	O
announcement	O
of	O
Penumbra	B-Application
:	I-Application
Black	I-Application
Plague	I-Application
,	O
the	O
series	O
(	O
originally	O
intended	O
to	O
be	O
a	O
trilogy	O
)	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
</s>
<s>
Penumbra	B-Application
:	I-Application
Requiem	I-Application
was	O
officially	O
announced	O
on	O
16	O
April	O
2008	O
.	O
</s>
<s>
During	O
the	O
expansion	O
's	O
development	O
,	O
work	O
also	O
began	O
on	O
what	O
would	O
become	O
Amnesia	B-Application
:	I-Application
The	I-Application
Dark	I-Application
Descent	I-Application
.	O
</s>
<s>
Penumbra	B-Application
:	I-Application
Requiem	I-Application
was	O
less	O
popular	O
than	O
the	O
previous	O
games	O
in	O
the	O
series	O
,	O
receiving	O
"	O
average	O
"	O
reviews	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
