<s>
is	O
a	O
role-playing	O
video	O
game	O
for	O
iOS	B-Application
,	O
Android	B-Application
,	O
and	O
PlayStation	B-Device
Vita	I-Device
developed	O
by	O
Media.Vision	O
and	O
published	O
by	O
Square	O
Enix	O
.	O
</s>
<s>
Chaos	B-Application
Rings	I-Application
Ω	O
was	O
available	O
on	O
the	O
App	B-Application
Store	I-Application
on	O
May	O
19	O
,	O
2011	O
.	O
</s>
<s>
Effective	O
May	O
31	O
,	O
2016	O
,	O
Square	O
Enix	O
ended	O
distribution	O
of	O
this	O
title	O
on	O
the	O
AppStore	B-Application
and	O
Google	B-Application
Play	I-Application
,	O
where	O
it	O
is	O
no	O
longer	O
available	O
for	O
download	O
now	O
except	O
for	O
on	O
Amazon	O
App	B-Application
Store	I-Application
.	O
</s>
<s>
It	O
is	O
the	O
prequel	O
to	O
Chaos	B-Application
Rings	I-Application
.	O
</s>
<s>
The	O
Agent	O
tells	O
them	O
the	O
same	O
set	O
up	O
that	O
was	O
in	O
the	O
original	O
Chaos	B-Application
Rings	I-Application
and	O
Vieg	O
challenges	O
him	O
.	O
</s>
<s>
The	O
iPhone	O
and	O
iPad	O
versions	O
received	O
"	O
generally	O
favorable	O
reviews	O
"	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
