<s>
beatmania	B-Application
IIDX	I-Application
substream	I-Application
is	O
a	O
1999	O
music	B-Application
video	I-Application
game	I-Application
which	O
had	O
a	O
different	O
songlist	O
and	O
could	O
be	O
linked	O
to	O
a	O
Dance	B-Application
Dance	I-Application
Revolution	I-Application
machine	O
for	O
simultaneous	O
play	O
.	O
</s>
<s>
If	O
either	O
the	O
Dance	B-Application
Dance	I-Application
Revolution	I-Application
player	O
or	O
IIDX	O
player	O
made	O
mistakes	O
,	O
the	O
other	O
game	O
became	O
more	O
difficult	O
.	O
</s>
<s>
Beatmania	B-Application
IIDX	I-Application
tasks	O
the	O
player	O
with	O
performing	O
songs	O
through	O
a	O
controller	O
consisting	O
of	O
seven	O
key	O
buttons	O
and	O
a	O
scratchable	O
turntable	O
.	O
</s>
<s>
In	O
1999	O
Beatmania	B-Application
IIDX	I-Application
was	O
released	O
.	O
</s>
<s>
Neil	O
Foster	O
of	O
Hardcore	O
Gaming	O
101	O
called	O
the	O
game	O
"	O
a	O
rocky	O
start	O
"	O
for	O
the	O
Beatmania	B-Application
IIDX	I-Application
series	O
,	O
since	O
it	O
had	O
music	B-Application
from	O
Beatmanias	O
first	O
two	O
iterations	O
(	O
1st	O
Mix	O
and	O
2nd	O
Mix	O
)	O
paired	O
with	O
new	O
songs	O
and	O
remixes	O
.	O
</s>
<s>
Bemani	O
developed	O
several	O
updates	O
to	O
the	O
game	O
after	O
its	O
release	O
,	O
including	O
Beatmania	B-Application
IIDX	I-Application
Substream	I-Application
.	O
</s>
<s>
Konami	O
decided	O
to	O
link	O
Club	B-Application
Version	I-Application
(	O
later	O
Substream	O
)	O
cabinets	O
with	O
Dance	B-Application
Dance	I-Application
Revolution	I-Application
2ndMix	I-Application
machines	O
for	O
simultaneous	O
play	O
,	O
leading	O
to	O
increased	O
success	O
.	O
</s>
