<s>
is	O
a	O
2009	B-Application
rhythm	O
game	O
created	O
by	O
Sega	O
and	O
Crypton	O
Future	O
Media	O
for	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
.	O
</s>
<s>
The	O
game	O
was	O
first	O
released	O
on	O
July	O
2	O
,	O
2009	B-Application
in	O
Japan	O
with	O
no	O
international	O
release	O
.	O
</s>
<s>
The	O
game	O
primarily	O
makes	O
use	O
of	O
Vocaloid	B-Application
,	O
a	O
series	O
of	O
singing	O
synthesizer	O
software	O
,	O
and	O
the	O
songs	O
created	O
using	O
these	O
Vocaloids	B-Application
,	O
most	O
notably	O
Hatsune	O
Miku	O
.	O
</s>
<s>
The	O
game	O
is	O
the	O
first	O
video	O
game	O
to	O
utilize	O
the	O
Vocaloid	B-Application
software	O
developed	O
by	O
the	O
Yamaha	O
Corporation	O
.	O
</s>
<s>
In	O
addition	O
,	O
Sega	O
has	O
released	O
Hatsune	B-Application
Miku	I-Application
:	I-Application
Project	I-Application
DIVA	I-Application
Dreamy	O
Theater	O
,	O
a	O
downloadable	O
game	O
on	O
the	O
PlayStation	O
Network	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
.	O
</s>
<s>
It	O
allows	O
players	O
to	O
play	O
Project	O
DIVA	O
on	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
with	O
updated	O
visuals	O
though	O
it	O
requires	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
to	O
be	O
plugged	O
into	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
via	O
USB	O
cable	O
.	O
</s>
<s>
The	O
game	O
features	O
three	O
difficulty	O
modes	O
:	O
Easy	O
,	O
Medium	O
,	O
and	O
Hard	O
,	O
as	O
opposed	O
to	O
the	O
four	O
difficulty	O
modes	O
of	O
the	O
series	O
forgoing	O
the	O
Extreme	O
difficulty	O
,	O
which	O
was	O
only	O
added	O
in	O
the	O
sequel	O
,	O
Hatsune	B-Application
Miku	I-Application
:	I-Application
Project	I-Application
DIVA	I-Application
2nd	I-Application
.	O
</s>
<s>
There	O
are	O
a	O
total	O
of	O
77	O
songs	O
available	O
in	O
Hatsune	B-Application
Miku	I-Application
:	I-Application
Project	I-Application
Diva	I-Application
.	O
</s>
