<s>
Heroes	B-Application
of	I-Application
Gaia	I-Application
(	O
)	O
,	O
known	O
in	O
the	O
separate	O
European	O
version	O
as	O
Castle	B-Application
of	I-Application
Heroes	I-Application
,	O
is	O
a	O
massively	B-Application
multiplayer	I-Application
online	I-Application
fantasy	B-Application
browser-based	B-Protocol
strategy	B-Protocol
game	I-Protocol
developed	O
by	O
the	O
Chinese	O
developer	O
Snail	O
Games	O
and	O
published	O
in	O
the	O
United	O
States	O
by	O
its	O
U.S.	O
publishing	O
division	O
,	O
Snail	O
Games	O
USA	O
.	O
</s>
<s>
It	O
is	O
published	O
in	O
Europe	O
by	O
gPotato	B-Application
Europe	O
,	O
through	O
the	O
online	O
game	O
portal	O
of	O
Gala	O
Networks	O
Europe	O
.	O
</s>
<s>
The	O
choice	O
is	O
between	O
Human	O
,	O
Elf	B-Application
,	O
Orc	B-Language
and	O
Undead	O
.	O
</s>
<s>
This	O
game	O
is	O
an	O
MMORPG	B-Protocol
,	O
and	O
a	O
server	O
can	O
have	O
between	O
several	O
hundred	O
and	O
several	O
thousand	O
active	O
players	O
.	O
</s>
<s>
Like	O
most	O
MMORPGs	B-Protocol
,	O
Heroes	B-Application
of	I-Application
Gaia	I-Application
is	O
a	O
persistent-state	O
world	O
.	O
</s>
<s>
Combat	O
is	O
central	O
to	O
the	O
gameplay	O
of	O
Heroes	B-Application
of	I-Application
Gaia	I-Application
.	O
</s>
<s>
Heroes	B-Application
of	I-Application
Gaia	I-Application
encourages	O
cooperative	O
gameplay	O
in	O
the	O
form	O
of	O
Guilds	O
.	O
</s>
<s>
2009	O
Heroes	B-Application
of	I-Application
Gaia	I-Application
received	O
the	O
Jing	O
Ling	O
award	O
for	O
being	O
"	O
the	O
best	O
Webgame	B-Protocol
"	O
in	O
China	O
.	O
</s>
