<s>
Shadow	B-Protocol
Cities	I-Protocol
was	O
an	O
early	O
location-based	O
mobile	B-Application
game	I-Application
,	O
created	O
by	O
the	O
Finnish	O
company	O
Grey	O
Area	O
.	O
</s>
<s>
The	O
game	O
was	O
exclusively	O
available	O
for	O
iPhone	B-Device
devices	O
.	O
</s>
<s>
Development	O
started	O
in	O
2008	O
,	O
only	O
a	O
year	O
after	O
the	O
first	O
iPhone	B-Device
was	O
released	O
,	O
with	O
$2.5	O
million	O
of	O
venture	O
capital	O
funding	O
.	O
</s>
