<s>
is	O
a	O
smartphone	B-Application
game	O
for	O
iOS	B-Application
and	O
Android	B-Application
,	O
created	O
by	O
Square	O
Enix	O
.	O
</s>
<s>
It	O
was	O
released	O
on	O
September	O
13	O
,	O
2012	O
,	O
for	O
iOS	B-Application
,	O
and	O
on	O
August	O
5	O
,	O
2013	O
,	O
for	O
Android	B-Application
.	O
</s>
<s>
The	O
concept	O
of	O
Guardian	B-Application
Cross	I-Application
was	O
created	O
by	O
Active	O
Time	O
Battle	O
designer	O
and	O
Square	O
Enix	O
director	O
Hiroyuki	O
Ito	O
.	O
</s>
<s>
The	O
development	O
team	O
that	O
implemented	O
this	O
concept	O
to	O
Guardian	B-Application
Cross	I-Application
was	O
previously	O
responsible	O
for	O
Knights	O
of	O
the	O
Crystals	O
.	O
</s>
<s>
The	O
director	O
of	O
the	O
card	O
illustrations	O
was	O
Ryoma	O
Ito	O
,	O
who	O
had	O
previously	O
served	O
as	O
the	O
character	O
designer	O
of	O
Final	B-Application
Fantasy	I-Application
Tactics	I-Application
Advance	I-Application
and	O
Final	B-Application
Fantasy	I-Application
Tactics	I-Application
A2	I-Application
:	I-Application
Grimoire	I-Application
of	I-Application
the	I-Application
Rift	I-Application
.	O
</s>
<s>
The	O
character	O
designs	O
of	O
Guardian	B-Application
Cross	I-Application
were	O
done	O
by	O
Akira	O
Oguro	O
,	O
who	O
had	O
previously	O
served	O
as	O
the	O
character	O
designer	O
of	O
Final	B-Application
Fantasy	I-Application
Dimensions	I-Application
.	O
</s>
<s>
The	O
composer	O
was	O
Naoshi	O
Mizuta	O
,	O
who	O
had	O
previously	O
served	O
as	O
the	O
composer	O
of	O
Final	B-Protocol
Fantasy	I-Protocol
XI	I-Protocol
.	O
</s>
<s>
In	O
January	O
2012	O
,	O
Square	O
Enix	O
registered	O
a	O
trademark	O
for	O
the	O
title	O
Guardian	B-Application
Cross	I-Application
.	O
</s>
<s>
In	O
February	O
2012	O
it	O
was	O
revealed	O
to	O
be	O
registered	O
to	O
Square	O
's	O
download	O
games	O
division	O
and	O
was	O
announced	O
first	O
for	O
iOS	B-Application
and	O
later	O
for	O
Android	B-Application
mobile	I-Application
operating	O
systems	O
.	O
</s>
<s>
After	O
being	O
delayed	O
,	O
the	O
game	O
was	O
shown	O
at	O
E3	O
in	O
June	O
2012	O
as	O
part	O
of	O
Square	O
Enix	O
's	O
upcoming	O
games	O
for	O
iOS	B-Application
.	O
</s>
<s>
The	O
game	O
was	O
eventually	O
released	O
on	O
September	O
13	O
,	O
2012	O
,	O
and	O
is	O
the	O
first	O
Free-to-play	O
game	O
released	O
on	O
iOS	B-Application
by	O
Square	O
Enix	O
.	O
</s>
<s>
During	O
the	O
original	O
launch	O
of	O
the	O
game	O
,	O
as	O
a	O
cross	O
promotion	O
with	O
their	O
MMORPG	B-Protocol
games	O
Final	B-Protocol
Fantasy	I-Protocol
XI	I-Protocol
and	O
Final	B-Protocol
Fantasy	I-Protocol
XIV	I-Protocol
,	O
rare	O
cards	O
depicting	O
monsters	O
from	O
both	O
games	O
could	O
be	O
earned	O
by	O
sending	O
invitations	O
to	O
friends	O
to	O
join	O
Guardian	B-Application
Cross	I-Application
.	O
</s>
<s>
It	O
allowed	O
players	O
to	O
fight	O
and	O
capture	O
the	O
four	O
Elemental	O
Archfiends	O
of	O
Final	B-Application
Fantasy	I-Application
IV	I-Application
.	O
</s>
<s>
It	O
allowed	O
players	O
to	O
fight	O
and	O
capture	O
the	O
"	O
super	O
bosses	O
"	O
of	O
Final	B-Application
Fantasy	I-Application
V	I-Application
.	O
Another	O
opportunity	O
to	O
obtain	O
the	O
Final	B-Application
Fantasy	I-Application
V	I-Application
cards	O
and	O
some	O
additional	O
cards	O
from	O
the	O
game	O
,	O
such	O
as	O
Gilgamesh	O
,	O
was	O
provided	O
from	O
10	O
July	O
2013	O
until	O
15	O
July	O
2013	O
.	O
</s>
<s>
It	O
allowed	O
players	O
to	O
fight	O
and	O
capture	O
the	O
primals	O
of	O
Eorzea	O
from	O
Final	B-Protocol
Fantasy	I-Protocol
XIV	I-Protocol
:	I-Protocol
A	I-Protocol
Realm	I-Protocol
Reborn	I-Protocol
.	O
</s>
<s>
Guardian	B-Application
Cross	I-Application
was	O
in	O
the	O
top	O
100	O
highest-grossing	O
games	O
,	O
and	O
the	O
top	O
150	O
free	O
games	O
in	O
the	O
iTunes	O
App	O
Store	O
.	O
</s>
