<s>
Tribes	B-Operating_System
2	I-Operating_System
is	O
a	O
first-person	O
shooter	O
multiplayer	O
video	O
game	O
developed	O
by	O
Dynamix	O
and	O
published	O
by	O
Sierra	O
On-Line	O
in	O
2001	O
as	O
a	O
sequel	O
to	O
Starsiege	B-Application
:	I-Application
Tribes	I-Application
.	O
</s>
<s>
Set	O
in	O
the	O
year	O
3941	O
of	O
the	O
fictional	O
Earthsiege	B-Application
universe	O
,	O
Tribes	B-Operating_System
2	I-Operating_System
allows	O
the	O
user	O
to	O
play	O
as	O
a	O
soldier	O
in	O
one	O
of	O
several	O
factions	O
(	O
referred	O
to	O
in	O
the	O
game	O
as	O
tribes	B-Application
)	O
,	O
namely	O
the	O
Children	O
of	O
the	O
Phoenix	O
,	O
the	O
Blood	O
Eagle	O
,	O
the	O
Diamond	O
Sword	O
,	O
and	O
the	O
Starwolf	O
.	O
</s>
<s>
Tribes	B-Operating_System
2	I-Operating_System
is	O
a	O
multiplayer	O
online	O
game	O
,	O
designed	O
for	O
Internet	O
or	O
LAN	B-General_Concept
play	O
with	O
up	O
to	O
128	O
players	O
(	O
64	O
vs	O
64	O
)	O
or	O
bots	O
per	O
match	O
,	O
although	O
a	O
small	O
single-player	O
tutorial	O
mode	O
is	O
included	O
.	O
</s>
<s>
Each	O
match	O
takes	O
place	O
on	O
an	O
Earthsiege-themed	O
map	O
.	O
</s>
<s>
The	O
Tribes	B-Operating_System
2	I-Operating_System
engine	O
,	O
an	O
early	O
version	O
of	O
the	O
Torque	B-Application
Game	I-Application
Engine	I-Application
,	O
is	O
capable	O
of	O
both	O
indoor	O
and	O
outdoor	O
maps	O
,	O
with	O
expansive	O
play	O
areas	O
.	O
</s>
<s>
These	O
modes	O
include	O
Capture	B-Application
the	I-Application
Flag	I-Application
,	O
deathmatch	O
,	O
Rabbit	O
,	O
Arena	O
,	O
Hunters	O
,	O
Siege	O
,	O
Gauntlet	O
,	O
and	O
Bounty	O
.	O
</s>
<s>
Tribes	B-Operating_System
2	I-Operating_System
gameplay	O
makes	O
extensive	O
use	O
of	O
jet	O
pack-powered	O
flight	O
,	O
which	O
adds	O
a	O
notable	O
vertical	O
element	O
to	O
combat	O
,	O
and	O
a	O
skiing	O
action	O
to	O
slide	O
down	O
slopes	O
.	O
</s>
<s>
As	O
such	O
,	O
playing	O
style	O
varies	O
dramatically	O
from	O
player	O
to	O
player	O
,	O
and	O
from	O
moment	O
to	O
moment	O
,	O
but	O
Tribes	B-Operating_System
2	I-Operating_System
gameplay	O
may	O
be	O
generalized	O
as	O
being	O
fast-paced	O
three-dimensional	O
combat	O
over	O
a	O
wide	O
playing	O
area	O
.	O
</s>
<s>
Player	O
vs	O
player	O
combat	O
is	O
a	O
central	O
element	O
of	O
Tribes	B-Operating_System
2	I-Operating_System
gameplay	O
,	O
even	O
in	O
team-based	O
modes	O
.	O
</s>
<s>
Tribes	B-Operating_System
2	I-Operating_System
was	O
developed	O
by	O
Dynamix	O
as	O
a	O
sequel	O
to	O
Starsiege	B-Application
:	I-Application
Tribes	I-Application
.	O
</s>
<s>
On	O
November	O
2	O
,	O
2008	O
,	O
Sierra/Vivendi	O
disabled	O
the	O
authentication	O
servers	O
required	O
for	O
its	O
online	O
multiplayer	O
and	O
dropped	O
all	O
official	O
support	O
for	O
the	O
Tribes	B-Application
franchise	O
.	O
</s>
<s>
The	O
Torque	B-Application
3D	I-Application
game	O
engine	O
,	O
on	O
which	O
Tribes	B-Operating_System
2	I-Operating_System
is	O
built	O
,	O
was	O
released	O
by	O
GarageGames	O
under	O
the	B-License
MIT	I-License
license	I-License
on	O
September	O
20	O
,	O
2012	O
.	O
</s>
<s>
The	O
Tribes	B-Operating_System
2	I-Operating_System
source	O
code	O
beside	O
the	O
Torque	B-Application
engine	O
was	O
not	O
made	O
available	O
.	O
</s>
<s>
Published	O
by	O
Sierra	O
On-Line	O
,	O
it	O
was	O
released	O
for	O
Microsoft	B-Application
Windows	I-Application
in	O
North	O
America	O
on	O
March	O
28	O
,	O
2001	O
,	O
in	O
Europe	O
on	O
April	O
13	O
,	O
2001	O
,	O
and	O
in	O
Japan	O
on	O
June	O
22	O
,	O
2001	O
(	O
where	O
it	O
was	O
published	O
by	O
Capcom	O
)	O
.	O
</s>
<s>
A	O
Linux	B-Application
port	O
was	O
released	O
by	O
Loki	O
Entertainment	O
on	O
April	O
19	O
,	O
2001	O
.	O
</s>
<s>
On	O
November	O
20	O
,	O
2002	O
,	O
Sierra	O
released	O
an	O
update	O
for	O
Tribes	B-Operating_System
2	I-Operating_System
.	O
</s>
<s>
Sierra	O
,	O
which	O
was	O
then	O
part	O
of	O
Vivendi	O
Universal	O
Games	O
,	O
licensed	O
the	O
franchise	O
to	O
Irrational	O
Games	O
for	O
a	O
third	O
installment	O
;	O
Tribes	B-Application
:	I-Application
Vengeance	I-Application
was	O
released	O
in	O
October	O
2004	O
.	O
</s>
<s>
In	O
an	O
effort	O
to	O
increase	O
interest	O
in	O
the	O
upcoming	O
sequel	O
,	O
Sierra	O
released	O
both	O
the	O
original	O
Starsiege	B-Application
:	I-Application
Tribes	I-Application
and	O
Tribes	B-Operating_System
2	I-Operating_System
as	O
freeware	B-License
download	O
on	O
May	O
4	O
,	O
2004	O
.	O
</s>
<s>
In	O
2015	O
,	O
the	O
game	O
was	O
released	O
as	O
freeware	B-License
by	O
Hi-Rez	O
Studios	O
.	O
</s>
<s>
Tribes	B-Operating_System
2	I-Operating_System
received	O
"	O
generally	O
favorable	O
reviews	O
"	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
<s>
Combined	O
sales	O
of	O
all	O
Tribes	B-Application
computer	O
games	O
released	O
between	O
those	O
dates	O
had	O
reached	O
480,000	O
units	O
in	O
the	O
U.S.	O
by	O
August	O
2006	O
.	O
</s>
