<s>
Metal	B-Application
Slug	I-Application
Advance	I-Application
is	O
a	O
run	O
and	O
gun	O
video	O
game	O
for	O
the	O
Game	B-Device
Boy	I-Device
Advance	I-Device
handheld	O
system	O
created	O
by	O
SNK	O
Playmore	O
in	O
2004	O
,	O
and	O
is	O
canon	O
to	O
the	O
Metal	B-Application
Slug	I-Application
series	O
.	O
</s>
<s>
The	O
gameplay	O
is	O
very	O
similar	O
to	O
any	O
other	O
Metal	B-Application
Slug	I-Application
game	O
,	O
but	O
with	O
two	O
new	O
systems	O
;	O
the	O
life	O
system	O
,	O
and	O
the	O
card	O
system	O
.	O
</s>
<s>
The	O
life	O
system	O
is	O
simply	O
a	O
life	O
bar	O
for	O
players	O
,	O
as	O
it	O
replaces	O
the	O
extra	O
lives	O
from	O
all	O
the	O
other	O
Metal	B-Application
Slug	I-Application
games	O
.	O
</s>
<s>
The	O
cards	O
have	O
many	O
different	O
purposes	O
,	O
from	O
giving	O
detailed	O
info	O
on	O
items	O
and	O
characters	O
from	O
the	O
Metal	B-Application
Slug	I-Application
series	O
to	O
boosting	O
player	O
abilities	O
,	O
and	O
even	O
unlocking	O
special	O
(	O
and	O
new	O
)	O
slugs	O
.	O
</s>
<s>
Metal	B-Application
Slug	I-Application
Advance	I-Application
received	O
"	O
generally	O
favorable	O
"	O
reviews	O
according	O
to	O
review	O
aggregator	O
Metacritic	O
.	O
</s>
