<s>
It	O
is	O
the	O
twelfth	O
original	O
installment	O
in	O
the	O
Contra	B-Application
series	I-Application
.	O
</s>
<s>
Contra	B-Application
ReBirth	I-Application
retains	O
the	O
same	O
sprite-based	O
side-scrolling	O
gameplay	O
as	O
the	O
series	O
 '	O
earlier	O
installments	O
.	O
</s>
<s>
The	O
game	O
can	O
be	O
played	O
with	O
the	O
standard	O
Wii	B-Device
Remote	I-Device
,	O
as	O
well	O
as	O
with	O
the	O
Classic	B-Device
Controller	I-Device
or	O
a	O
Nintendo	B-Device
GameCube	I-Device
controller	I-Device
.	O
</s>
<s>
As	O
with	O
most	O
Contra	B-Application
games	O
,	O
up	O
to	O
two	O
players	O
can	O
play	O
simultaneously	O
.	O
</s>
<s>
The	O
player	O
initially	O
has	O
a	O
choice	O
between	O
two	O
different	O
player	O
characters	O
:	O
Bill	B-Application
Rizer	I-Application
,	O
the	O
traditional	O
Contra	B-Application
hero	O
,	O
or	O
Genbei	O
Yagyu	O
from	O
Neo	B-Application
Contra	I-Application
.	O
</s>
<s>
The	O
dual	O
weapon	O
system	O
from	O
Contra	B-Application
III	I-Application
:	I-Application
The	I-Application
Alien	I-Application
Wars	I-Application
returns	O
and	O
the	O
player	O
's	O
normal	O
gun	O
can	O
now	O
shoot	O
in	O
autofire	O
once	O
again	O
.	O
</s>
<s>
In	O
2633	O
,	O
the	O
Neo-Salamander	O
Force	O
,	O
led	O
by	O
their	O
mysterious	O
leader	O
Chief	O
Salamander	O
,	O
travel	O
back	O
to	O
1973	O
to	O
take	O
out	O
the	O
Contra	B-Application
force	O
,	O
when	O
the	O
Earth	O
's	O
defenses	O
are	O
considered	O
by	O
them	O
as	O
"	O
primitive	O
"	O
.	O
</s>
<s>
Bill	B-Application
Rizer	I-Application
and	O
Genbei	O
Yagyu	O
,	O
two	O
members	O
of	O
the	O
present-day	O
Contra	B-Application
team	O
,	O
are	O
deployed	O
by	O
the	O
Galactic	O
President	O
to	O
travel	O
back	O
in	O
time	O
to	O
stop	O
them	O
.	O
</s>
<s>
With	O
the	O
help	O
of	O
Brownie	O
or	O
Tsugumin	O
(	O
a	O
miniature	O
gynoid	O
similar	O
to	O
Browny	O
from	O
Contra	B-Application
:	I-Application
Hard	I-Application
Corps	I-Application
)	O
and	O
Plissken	O
(	O
a	O
reptilian	O
alien	O
)	O
the	O
Contra	B-Application
warriors	O
manage	O
to	O
take	O
down	O
the	O
Neo	O
Salamander	O
Force	O
.	O
</s>
<s>
In	O
the	O
true	O
ending	O
of	O
the	O
game	O
,	O
it	O
is	O
revealed	O
Chief	O
Salamander	O
is	O
actually	O
"	O
Plissken	O
"	O
,	O
who	O
has	O
infiltrated	O
the	O
Contra	B-Application
unit	O
under	O
an	O
assumed	O
name	O
.	O
</s>
<s>
The	O
music	O
consists	O
of	O
remixes	O
of	O
previous	O
Contra	B-Application
songs	O
.	O
</s>
