<s>
Phase	O
is	O
a	O
music-themed	O
iPod	B-Operating_System
game	I-Operating_System
created	O
by	O
Harmonix	O
exclusively	O
for	O
the	O
iPod	B-Device
click	I-Device
wheel	I-Device
interface	O
.	O
</s>
<s>
It	O
is	O
similar	O
to	O
other	O
Harmonix	O
games	O
Amplitude	B-Application
and	O
FreQuency	B-Application
.	O
</s>
<s>
Down	O
each	O
line	O
come	O
colored	O
circles	O
,	O
and	O
the	O
player	O
must	O
click	O
the	O
corresponding	O
button	O
on	O
the	O
click	B-Device
wheel	I-Device
when	O
the	O
circle	O
reaches	O
the	O
bottom	O
of	O
the	O
screen	O
.	O
</s>
<s>
The	O
circles	O
are	O
arranged	O
on	O
the	O
track	O
in	O
relation	O
to	O
the	O
beat	O
of	O
the	O
music	B-Application
track	O
being	O
played	O
.	O
</s>
<s>
These	O
require	O
the	O
player	O
to	O
swipe	O
their	O
finger	O
across	O
the	O
click	B-Device
wheel	I-Device
at	O
the	O
correct	O
pace	O
,	O
instead	O
of	O
clicking	O
the	O
wheel	O
buttons	O
.	O
</s>
<s>
Custom	O
songs	O
must	O
be	O
added	O
to	O
a	O
Phase	O
playlist	O
in	O
iTunes	B-Operating_System
,	O
where	O
they	O
are	O
processed	O
for	O
proper	O
interpretation	O
and	O
become	O
available	O
in	O
the	O
game	O
.	O
</s>
<s>
The	O
Phase	O
music	B-Application
playlist	O
is	O
limited	O
to	O
1,000	O
songs	O
.	O
</s>
<s>
It	O
does	O
not	O
work	O
with	O
the	O
iPhone	B-Device
or	O
iPod	B-Device
Touch	I-Device
.	O
</s>
