<s>
Duels	B-Application
was	O
a	O
free	O
player	O
vs.	O
player	O
browser	B-Protocol
game	I-Protocol
.	O
</s>
<s>
A	O
player	O
's	O
avatar	B-Application
could	O
either	O
fight	O
another	O
player	O
controlled	O
avatar	B-Application
,	O
or	O
an	O
NPC	O
to	O
gain	O
experience	O
points	O
,	O
gold	O
,	O
and	O
tokens	O
.	O
</s>
<s>
Gold	O
was	O
used	O
to	O
purchase	O
armor	O
,	O
weapons	O
,	O
pets	O
,	O
and	O
,	O
in	O
Duels	B-Application
2.0	O
,	O
actions	O
.	O
</s>
<s>
When	O
a	O
player	O
accepted	O
a	O
challenge	O
,	O
the	O
avatars	B-Application
fought	O
it	O
out	O
in	O
real	O
time	O
,	O
but	O
without	O
player	O
interaction	B-General_Concept
.	O
</s>
<s>
Duels	B-Application
offered	O
paid	O
memberships	O
called	O
Nobles	O
or	O
Patrons	O
with	O
many	O
useful	O
perk	O
choices	O
,	O
and	O
non-member	O
players	O
could	O
purchase	O
Challenge	O
Coins	O
which	O
gave	O
access	O
to	O
some	O
of	O
these	O
more	O
advanced	O
menu	O
choices	O
for	O
playing	O
,	O
but	O
the	O
game	O
was	O
not	O
pay	O
to	O
play	O
.	O
</s>
<s>
Due	O
to	O
articles	O
featured	O
on	O
TechCrunch	O
and	O
Digg	B-Application
,	O
the	O
game	O
experienced	O
more	O
network	O
traffic	O
than	O
its	O
servers	O
could	O
handle	O
at	O
its	O
launch	O
in	O
August	O
2007	O
.	O
</s>
<s>
In	O
December	O
2007	O
Duels	B-Application
launched	O
a	O
new	O
version	O
of	O
the	O
game	O
,	O
called	O
Duels	B-Application
2.0	O
.	O
</s>
<s>
This	O
version	O
introduced	O
female	O
avatars	B-Application
and	O
a	O
new	O
level	O
of	O
strategy	O
with	O
the	O
addition	O
of	O
actions	O
.	O
</s>
<s>
Other	O
added	O
features	O
included	O
multiple	O
ladders	O
for	O
different	O
level	O
brackets	O
,	O
up	O
to	O
ten	O
playable	O
avatars	B-Application
per	O
single	O
player	O
account	O
,	O
and	O
multi	O
item	O
trading	O
.	O
</s>
<s>
The	O
August	O
expansion	O
"	O
Treasure	O
of	O
Abtu-Khan	O
"	O
was	O
introduced	O
with	O
Noble	O
and	O
Patron	O
challenge	O
coin	O
users	O
having	O
the	O
option	O
to	O
shop	O
in	O
three	O
other	O
in-game	O
stores	O
besides	O
the	O
basic	O
Armory	O
that	O
all	O
duels.com	B-Application
players	O
could	O
use	O
.	O
</s>
<s>
Challenge	O
Coin	O
users	O
could	O
also	O
choose	O
to	O
re-spec	O
their	O
avatars	B-Application
into	O
two	O
cat	O
folk	O
races	O
besides	O
the	O
original	O
human	O
and	O
elf	O
options	O
.	O
</s>
<s>
This	O
also	O
allowed	O
players	O
to	O
transform	O
their	O
avatar	B-Application
into	O
the	O
undead	O
or	O
a	O
feline	O
as	O
well	O
as	O
join	O
alliance	O
between	O
the	O
Elementals	O
or	O
Singlemind	O
.	O
</s>
<s>
Characters	O
would	O
not	O
get	O
any	O
more	O
awards	O
after	O
challenging	O
an	O
avatar	B-Application
for	O
the	O
third	O
time	O
in	O
a	O
day	O
.	O
</s>
<s>
Tokens	O
were	O
usually	O
earned	O
through	O
fighting	O
other	O
avatars	B-Application
.	O
</s>
<s>
The	O
cost	O
of	O
packs	O
differed	O
greatly	O
,	O
for	O
example	O
the	O
"	O
Duels	B-Application
Core	O
Set	O
IV	O
"	O
cost	O
30	O
tokens	O
,	O
while	O
the	O
"	O
Corruption	O
"	O
set	O
cost	O
over	O
a	O
thousand	O
tokens	O
.	O
</s>
<s>
One	O
of	O
the	O
most	O
appealing	O
parts	O
of	O
Duels	B-Application
was	O
to	O
trade	O
in	O
the	O
Armory	O
for	O
rarer	O
items	O
from	O
the	O
older	O
Item	O
Sets	O
;	O
so	O
what	O
was	O
common	O
and	O
inexpensive	O
one	O
day	O
was	O
rare	O
and	O
very	O
valuable	O
in	O
the	O
future	O
.	O
</s>
<s>
Tutorial	O
quests	O
were	O
quests	O
teaching	O
avatars	B-Application
about	O
the	O
multiple	O
functions	O
of	O
Duels	B-Application
.	O
</s>
