<s>
,	O
alternatively	O
known	O
as	O
The	O
Key	O
of	O
Avalon	O
is	O
an	O
arcade	O
game	O
developed	O
by	O
Hitmaker	O
and	O
published	O
by	O
Sega	O
on	O
the	O
Triforce	B-Device
arcade	O
board	O
.	O
</s>
<s>
It	O
is	O
the	O
third	O
card	O
arcade	O
game	O
by	O
Sega	O
,	O
following	O
World	B-Application
Club	I-Application
Champion	I-Application
Football	I-Application
and	O
Mushiking	B-Application
:	I-Application
The	I-Application
King	I-Application
of	I-Application
Beetles	I-Application
.	O
</s>
<s>
It	O
was	O
often	O
compared	O
to	O
Culdcept	B-Application
,	O
and	O
is	O
able	O
to	O
be	O
played	O
by	O
multiple	O
players	O
at	O
once	O
,	O
using	O
a	O
free	O
in	O
and	O
free	O
out	O
method	O
where	O
other	O
players	O
can	O
drop	O
in	O
and	O
drop	O
out	O
of	O
a	O
match	O
at	O
any	O
time	O
.	O
</s>
<s>
It	O
was	O
one	O
of	O
Sega	O
's	O
most	O
successful	O
arcade	O
games	O
in	O
2003	O
,	O
mentioned	O
alongside	O
Dragon	B-Application
Treasure	I-Application
as	O
a	O
"	O
new	O
product	O
"	O
securing	O
high	O
sales	O
in	O
their	O
financial	O
report	O
.	O
</s>
<s>
Its	O
popularity	O
decreased	O
after	O
Quest	B-Application
of	I-Application
D	I-Application
and	O
Sangokushi	B-Application
Taisen	I-Application
appeared	O
,	O
which	O
had	O
online	O
features	O
that	O
Avalon	B-Application
no	I-Application
Kagi	I-Application
lacked	O
.	O
</s>
