<s>
Gem	B-Application
Keeper	I-Application
is	O
an	O
iOS	B-Application
game	O
developed	O
by	O
NCSOFT	O
and	O
released	O
on	O
October	O
14	O
,	O
2011	O
.	O
</s>
<s>
148Apps	O
said	O
"	O
For	O
a	O
newcomer	O
to	O
tower	O
defense	O
games	O
,	O
Gem	B-Application
Keepers	I-Application
is	O
the	O
perfect	O
place	O
to	O
start	O
.	O
</s>
<s>
For	O
those	O
who	O
already	O
love	O
the	O
genre	O
,	O
Gem	B-Application
Keepers	I-Application
is	O
a	O
no-brainer	O
.	O
</s>
