<s>
Tap	B-Application
Tap	I-Application
or	O
Tap	B-Language
Tap	I-Language
Revenge	I-Language
was	O
a	O
series	O
of	O
rhythm	O
games	O
by	O
Tapulous	O
available	O
for	O
the	O
iOS	B-Operating_System
of	O
which	O
several	O
versions	O
,	O
both	O
purchasable	O
and	O
free	O
,	O
have	O
been	O
produced	O
.	O
</s>
<s>
There	O
were	O
also	O
"	O
shakes	O
"	O
,	O
which	O
required	O
the	O
player	O
to	O
move	O
the	O
iPhone	B-Device
,	O
iPod	B-Device
Touch	I-Device
or	O
iPad	B-Device
to	O
the	O
right	O
,	O
left	O
,	O
or	O
backwards	O
.	O
</s>
<s>
The	O
apps	O
were	O
pulled	O
from	O
the	O
app	B-Application
store	I-Application
and	O
had	O
their	O
servers	O
shut	O
down	O
in	O
February	O
2014	O
.	O
</s>
<s>
There	O
were	O
23	O
games	O
in	O
the	O
Tap	B-Application
Tap	I-Application
series	O
of	O
games	O
,	O
18	O
which	O
are	O
artist-specific	O
.	O
</s>
<s>
On	O
March	O
3	O
,	O
2009	O
,	O
Tap	B-Application
Tap	I-Application
Revenge	I-Application
2	I-Application
was	O
released	O
.	O
</s>
<s>
Tap	B-Language
Tap	I-Language
Revenge	I-Language
became	O
the	O
most-downloaded	O
free	O
application	O
on	O
the	O
App	B-Application
Store	I-Application
only	O
three	O
days	O
after	O
its	O
release	O
,	O
and	O
reached	O
half	O
a	O
million	O
downloads	O
over	O
that	O
period	O
.	O
</s>
<s>
In	O
October	O
2008	O
,	O
Tapulous	O
announced	O
that	O
they	O
were	O
working	O
on	O
a	O
premium	O
Nine	O
Inch	O
Nails-branded	O
version	O
of	O
Tap	B-Language
Tap	I-Language
Revenge	I-Language
,	O
including	O
a	O
special	O
Nine	O
Inch	O
Nails	O
skin	O
and	O
16	O
songs	O
from	O
the	O
band	O
's	O
albums	O
Ghosts	O
I	O
–	O
IV	O
and	O
The	O
Slip	O
,	O
some	O
of	O
which	O
would	O
be	O
specially	O
edited	O
for	O
the	O
game	O
.	O
</s>
<s>
Tap	B-Application
Tap	I-Application
Dance	I-Application
was	O
released	O
in	O
December	O
2008	O
,	O
featuring	O
electronic	O
music	B-Application
from	O
artists	O
such	O
as	O
Daft	O
Punk	O
,	O
Justice	O
,	O
Digitalism	O
,	O
and	O
The	O
Chemical	O
Brothers	O
.	O
</s>
<s>
It	O
was	O
first	O
to	O
feature	O
the	O
rewritten	O
OpenGL-based	O
game	O
engine	O
that	O
powered	O
all	O
subsequent	O
games	O
in	O
the	O
series	O
,	O
and	O
introduced	O
features	O
such	O
as	O
special	O
boss	O
tracks	O
for	O
certain	O
songs	O
with	O
custom	O
visuals	O
,	O
along	O
with	O
core	O
features	O
like	O
tap	O
and	O
hold	O
notes	O
.	O
</s>
<s>
It	O
was	O
well-received	O
critically	O
,	O
winning	O
IGN	O
's	O
Best	O
Music	B-Application
Game	I-Application
of	O
2008	O
.	O
</s>
