<s>
Dance	B-Operating_System
Dance	I-Operating_System
Revolution	I-Operating_System
Freedom	I-Operating_System
was	O
a	O
rhythm	O
game	O
by	O
Konami	O
originally	O
made	O
available	O
for	O
the	O
iOS	B-Operating_System
,	O
as	O
part	O
of	O
the	O
company	O
's	O
Dance	B-Application
Dance	I-Application
Revolution	I-Application
series	O
of	O
music	B-Application
video	I-Application
games	I-Application
.	O
</s>
<s>
The	O
game	O
was	O
made	O
available	O
via	O
Apple	B-Application
's	I-Application
App	I-Application
Store	I-Application
only	O
in	O
North	O
America	O
on	O
February	O
11	O
,	O
2011	O
.	O
</s>
<s>
It	O
has	O
since	O
been	O
pulled	O
from	O
the	O
App	B-Application
Store	I-Application
for	O
reasons	O
unknown	O
,	O
but	O
one	O
factor	O
may	O
have	O
been	O
the	O
poor	O
syncing	O
in	O
the	O
song	O
's	O
charts	O
and	O
the	O
notoriety	O
of	O
the	O
song	O
's	O
charts	O
being	O
poorly	O
made	O
that	O
lead	O
to	O
it	O
being	O
withdrawn	O
a	O
month	O
after	O
release	O
.	O
</s>
<s>
Gameplay	O
remains	O
similar	O
to	O
other	O
Dance	B-Application
Dance	I-Application
Revolution	I-Application
games	I-Application
,	O
as	O
players	O
hit	O
arrows	O
to	O
the	O
beat	O
of	O
a	O
selected	O
song	O
.	O
</s>
<s>
Unlike	O
other	O
DDR	B-Application
titles	O
(	O
excluding	O
Dance	B-Application
Dance	I-Application
Revolution	I-Application
S	O
)	O
,	O
Dance	B-Operating_System
Dance	I-Operating_System
Revolution	I-Operating_System
Freedom	I-Operating_System
uses	O
a	O
virtual	O
dance	B-Device
pad	I-Device
on	O
the	O
device	O
's	O
touch	O
screen	O
instead	O
of	O
a	O
full-fledged	O
dance	B-Device
pad	I-Device
peripheral	O
.	O
</s>
