<s>
Half-Life	B-Application
2	I-Application
:	I-Application
Episode	I-Application
Two	I-Application
is	O
a	O
2007	O
first-person	O
shooter	O
game	O
developed	O
and	O
published	O
by	O
Valve	O
.	O
</s>
<s>
Following	O
Episode	B-Application
One	I-Application
(	O
2006	O
)	O
,	O
it	O
is	O
the	O
second	O
of	O
two	O
shorter	O
episodic	O
games	O
that	O
continue	O
the	O
story	O
of	O
Half-Life	B-Application
2	I-Application
(	O
2004	O
)	O
.	O
</s>
<s>
Episode	O
Two	O
was	O
released	O
on	O
10	O
October	O
,	O
2007	O
,	O
for	O
Windows	O
on	O
Valve	O
's	O
distribution	O
service	O
Steam	B-Application
,	O
and	O
as	O
a	O
part	O
of	O
The	B-Application
Orange	I-Application
Box	I-Application
,	O
a	O
compilation	O
of	O
Valve	O
games	O
for	O
Xbox	B-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
.	O
</s>
<s>
Half-Life	B-Application
2	I-Application
:	I-Application
Episode	I-Application
Three	I-Application
was	O
announced	O
for	O
Christmas	O
2007	O
,	O
but	O
was	O
canceled	O
as	O
Valve	O
abandoned	O
episodic	O
development	O
.	O
</s>
<s>
In	O
2020	O
,	O
after	O
canceling	O
several	O
further	O
Half-Life	O
projects	O
,	O
Valve	O
released	O
Half-Life	B-Application
:	I-Application
Alyx	I-Application
.	O
</s>
<s>
Episode	O
Two	O
has	O
more	O
puzzles	O
than	O
Episode	B-Application
One	I-Application
,	O
including	O
the	O
biggest	O
physics	O
puzzle	O
yet	O
in	O
the	O
series	O
—	O
a	O
damaged	O
bridge	O
.	O
</s>
<s>
As	O
in	O
the	O
previous	O
two	O
games	O
,	O
Episode	O
Two	O
features	O
numerous	O
"	O
achievements	B-Application
"	O
(	O
similar	O
to	O
PlayStation	B-Operating_System
3	I-Operating_System
's	O
Trophies	O
and	O
Xbox	B-Application
Live	I-Application
's	O
Achievements	B-Application
)	O
for	O
carrying	O
out	O
certain	O
tasks	O
.	O
</s>
<s>
Episode	O
Two	O
featured	O
a	O
new	O
Hunter	O
enemy	O
,	O
which	O
had	O
just	O
been	O
seen	O
briefly	O
in	O
a	O
recorded	O
message	O
in	O
Episode	B-Application
One	I-Application
.	O
</s>
<s>
Near	O
the	O
end	O
of	O
the	O
game	O
,	O
the	O
player	O
uses	O
"	O
Magnusson	O
Devices	O
"	O
,	O
which	O
designer	O
Dario	O
Casali	O
described	O
as	O
a	O
"	O
sticky	O
bomb	O
that	O
you	O
fire	O
at	O
a	O
Strider	O
's	O
underbelly	O
that	O
will	O
draw	O
power	O
from	O
the	O
Strider	O
's	O
internal	O
power	O
source	B-Application
"	O
.	O
</s>
<s>
This	O
will	O
allow	O
them	O
to	O
summon	O
reinforcements	O
and	O
destroy	O
the	B-Application
Resistance	I-Application
.	O
</s>
<s>
They	O
learn	O
that	O
the	B-Application
Resistance	I-Application
may	O
be	O
able	O
to	O
close	O
the	O
portal	O
using	O
a	O
copy	O
of	O
a	O
Combine	O
transmission	O
Alyx	O
is	O
carrying	O
.	O
</s>
<s>
Kleiner	O
insists	O
that	O
it	O
should	O
be	O
used	O
to	O
aid	O
the	B-Application
Resistance	I-Application
effort	O
,	O
while	O
Eli	O
counters	O
that	O
it	O
is	O
impossible	O
to	O
control	O
and	O
must	O
be	O
destroyed	O
.	O
</s>
<s>
Episode	O
Two	O
was	O
the	O
second	O
in	O
a	O
planned	O
trilogy	O
of	O
shorter	O
episodic	O
games	O
that	O
would	O
continue	O
the	O
story	O
of	O
Half-Life	B-Application
2	I-Application
(	O
2004	O
)	O
.	O
</s>
<s>
It	O
was	O
developed	O
simultaneously	O
with	O
Episode	B-Application
One	I-Application
(	O
2006	O
)	O
by	O
a	O
team	O
led	O
by	O
David	O
Speyrer	O
.	O
</s>
<s>
An	O
announcement	O
was	O
made	O
on	O
July	O
13	O
,	O
2006	O
,	O
stating	O
that	O
Episode	O
Two	O
would	O
be	O
released	O
on	O
Xbox	B-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
in	O
addition	O
to	O
the	O
PC	O
,	O
where	O
previous	O
iterations	O
of	O
the	O
series	O
separated	O
.	O
</s>
<s>
Valve	O
handled	O
the	O
development	O
for	O
the	O
PC	O
and	O
Xbox	B-Operating_System
360	I-Operating_System
,	O
while	O
Electronic	O
Arts	O
(	O
EA	O
)	O
worked	O
on	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
version	O
.	O
</s>
<s>
It	O
was	O
announced	O
on	O
September	O
7	O
,	O
2007	O
,	O
that	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
version	O
of	O
the	O
game	O
would	O
be	O
delayed	O
because	O
the	O
EA	O
studio	O
behind	O
the	O
game	O
was	O
in	O
the	O
United	O
Kingdom	O
,	O
away	O
from	O
Valve	O
's	O
development	O
team	O
,	O
and	O
therefore	O
lagged	O
behind	O
in	O
its	O
schedule	O
.	O
</s>
<s>
According	O
to	O
Valve	O
's	O
marketing	O
director	O
,	O
Doug	O
Lombardi	O
,	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
,	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
and	O
PC	O
versions	O
would	O
be	O
identical	O
in	O
functionality	O
and	O
performance	O
.	O
</s>
<s>
An	O
audio	O
commentary	O
is	O
also	O
featured	O
,	O
as	O
in	O
Episode	B-Application
One	I-Application
and	O
Lost	B-Application
Coast	I-Application
.	O
</s>
<s>
Half-Life	B-Application
2	I-Application
:	I-Application
Episode	I-Application
Two	I-Application
received	O
an	O
average	O
score	O
of	O
90.68	O
%	O
based	O
on	O
22	O
reviews	O
on	O
the	O
review	O
aggregator	O
GameRankings	O
.	O
</s>
<s>
Computer	O
and	O
Video	O
Games	O
said	O
that	O
although	O
the	O
Source	B-Application
engine	I-Application
was	O
dated	O
,	O
the	O
"	O
wonderful	O
art	O
design	O
and	O
the	O
odd	O
bit	O
of	O
technical	O
spit-shine	O
ensure	O
that	O
Episode	O
Two	O
 [ ... ] 	O
does	O
n't	O
lose	O
any	O
of	O
its	O
wow	O
factor	O
"	O
.	O
</s>
<s>
They	O
also	O
noticed	O
that	O
the	O
game	O
"	O
goes	O
about	O
fixing	O
a	O
lot	O
of	O
the	O
niggling	O
complaints	O
we	O
had	O
about	O
Episode	B-Application
One	I-Application
,	O
"	O
applauding	O
the	O
open	O
forests	O
and	O
rocky	O
hills	O
.	O
</s>
<s>
Half-Life	B-Application
2	I-Application
:	I-Application
Episode	I-Application
Three	I-Application
was	O
scheduled	O
for	O
release	O
by	O
Christmas	O
2007	O
,	O
but	O
was	O
canceled	O
as	O
Valve	O
abandoned	O
episodic	O
development	O
and	O
were	O
developing	O
a	O
new	O
game	O
engine	O
,	O
Source	B-Operating_System
2	I-Operating_System
.	O
</s>
<s>
After	O
canceling	O
several	O
further	O
Half-Life	O
games	O
,	O
Valve	O
released	O
Half-Life	B-Application
:	I-Application
Alyx	I-Application
in	O
2020	O
.	O
</s>
