<s>
Half-Life	B-Application
2	I-Application
:	I-Application
Deathmatch	I-Application
is	O
a	O
multiplayer	O
first-person	O
shooter	O
video	O
game	O
developed	O
by	O
Valve	O
.	O
</s>
<s>
Released	O
on	O
Steam	B-Application
on	O
November	O
30	O
,	O
2004	O
,	O
it	O
uses	O
many	O
of	O
the	O
assets	O
from	O
Half-Life	B-Application
2	I-Application
and	O
its	O
Source	B-Application
engine	I-Application
.	O
</s>
<s>
Also	O
included	O
are	O
portions	O
of	O
the	O
game	O
's	O
source	B-Application
code	O
,	O
which	O
were	O
the	O
basis	O
for	O
many	O
early	O
Source-based	O
multiplayer	O
modifications	O
.	O
</s>
<s>
The	O
game	O
is	O
the	O
successor	O
to	O
the	O
popular	O
multiplayer	O
component	O
of	O
the	O
original	O
Half-Life	O
,	O
but	O
is	O
offered	O
as	O
a	O
separate	O
product	O
from	O
Half-Life	B-Application
2	I-Application
.	O
</s>
<s>
In	O
the	O
team	O
deathmatch	O
mode	O
,	O
players	O
are	O
organized	O
in	O
two	O
teams	O
,	O
Resistance	O
and	O
Combine	O
,	O
both	O
of	O
them	O
with	O
different	O
characters	O
that	O
appear	O
exactly	O
as	O
they	O
do	O
in	O
Half-Life	B-Application
2	I-Application
.	O
</s>
<s>
Upon	O
the	O
release	O
and	O
subsequent	O
critical	O
reception	O
of	O
Half-Life	B-Application
2	I-Application
,	O
reviewers	O
expressed	O
disappointment	O
with	O
the	O
game	O
's	O
lack	O
of	O
multiplayer	O
.	O
</s>
<s>
Two	O
weeks	O
after	O
the	O
initial	O
release	O
of	O
Half-Life	B-Application
2	I-Application
,	O
Valve	O
revealed	O
and	O
released	O
Half-Life	B-Application
2	I-Application
:	I-Application
Deathmatch	I-Application
on	O
Steam	B-Application
.	O
</s>
<s>
Deathmatch	O
was	O
released	O
simultaneously	O
with	O
the	O
Source	B-Application
SDK	O
as	O
a	O
means	O
of	O
promoting	O
game	O
modifications	O
built	O
upon	O
the	O
platform	O
.	O
</s>
<s>
Valve	O
's	O
The	B-Application
Orange	I-Application
Box	I-Application
does	O
not	O
include	O
Half-Life	B-Application
2	I-Application
:	I-Application
Deathmatch	I-Application
,	O
however	O
,	O
the	O
game	O
was	O
upgraded	O
to	O
use	O
the	B-Application
Orange	I-Application
Box	I-Application
version	O
of	O
the	O
Source	B-Application
engine	I-Application
in	O
September	O
2010	O
.	O
</s>
<s>
Valve	O
announced	O
a	O
free	O
promotional	O
offer	O
on	O
January	O
10	O
,	O
2008	O
,	O
which	O
allowed	O
NVIDIA	O
graphics	O
card	O
users	O
to	O
download	O
and	O
play	O
Half-Life	B-Application
2	I-Application
:	I-Application
Deathmatch	I-Application
along	O
with	O
Portal	O
:	O
First	O
Slice	O
,	O
Half-Life	B-Application
2	I-Application
:	I-Application
Lost	I-Application
Coast	I-Application
,	O
and	O
Peggle	O
Extreme	O
.	O
</s>
<s>
In	O
September	O
2010	O
,	O
the	O
game	O
was	O
released	O
via	O
Steam	B-Application
for	O
OS	B-Operating_System
X	I-Operating_System
.	O
</s>
<s>
A	O
Linux	B-Application
version	O
came	O
more	O
than	O
two	O
years	O
later	O
,	O
in	O
March	O
2013	O
.	O
</s>
<s>
Half	B-Application
Life	I-Application
2	I-Application
:	I-Application
Deathmatch	I-Application
was	O
well-received	O
upon	O
its	O
release	O
,	O
with	O
reviewers	O
praising	O
its	O
inclusion	O
of	O
the	O
gravity	O
gun	O
.	O
</s>
<s>
GameSpot	O
lauded	O
the	O
game	O
for	O
the	O
Source	B-Application
engine	I-Application
's	O
"	O
impressive	O
use	O
of	O
physics	O
"	O
and	O
the	O
available	O
selection	O
of	O
maps	O
.	O
</s>
