<s>
Dr.	B-Device
Mario	I-Device
Express	I-Device
,	O
known	O
in	O
PAL	B-Language
regions	O
as	O
A	B-Device
Little	I-Device
Bit	I-Device
of	I-Device
...	I-Device
Dr.	I-Device
Mario	I-Device
,	O
is	O
a	O
Mario	B-Application
action	O
puzzle	O
video	O
game	O
published	O
by	O
Nintendo	O
.	O
</s>
<s>
The	O
game	O
was	O
released	O
as	O
a	O
DSiWare	O
title	O
for	O
the	O
Nintendo	B-Device
DSi	I-Device
platform	B-Application
.	O
</s>
<s>
Dr.	B-Device
Mario	I-Device
Express	I-Device
was	O
released	O
as	O
a	O
launch	O
title	O
for	O
the	O
DSiWare	O
service	O
in	O
Japan	O
on	O
December	O
24	O
,	O
2008	O
,	O
and	O
was	O
released	O
in	O
both	O
North	O
America	O
and	O
PAL	B-Language
regions	O
in	O
2009	O
.	O
</s>
<s>
The	O
game	O
was	O
developed	O
by	O
Arika	O
,	O
which	O
had	O
also	O
created	O
Dr.	B-Application
Mario	I-Application
Online	I-Application
Rx	I-Application
for	O
WiiWare	O
.	O
</s>
<s>
Dr.	B-Device
Mario	I-Device
Express	I-Device
features	O
the	O
general	O
gameplay	O
of	O
earlier	O
Dr.	B-Application
Mario	I-Application
puzzle	O
games	O
,	O
which	O
focus	O
on	O
eliminating	O
colored	O
viruses	B-Application
from	O
the	O
playing	O
field	O
by	O
matching	O
them	O
with	O
colored	O
capsules	O
.	O
</s>
<s>
Dr.	B-Device
Mario	I-Device
Express	I-Device
received	O
generally	O
positive	O
reviews	O
,	O
but	O
was	O
criticized	O
for	O
offering	O
fewer	O
playable	O
game	O
modes	O
than	O
earlier	O
Dr.	B-Application
Mario	I-Application
titles	O
.	O
</s>
<s>
Dr.	B-Device
Mario	I-Device
Express	I-Device
is	O
a	O
falling	O
block	O
tile-matching	B-Application
video	I-Application
game	I-Application
.	O
</s>
<s>
The	O
player	O
is	O
given	O
a	O
playing	O
field	O
,	O
seen	O
in	O
the	O
Nintendo	B-Device
DSi	I-Device
's	O
bottom	O
screen	O
,	O
populated	O
with	O
viruses	B-Application
of	O
three	O
colors	O
:	O
red	O
,	O
blue	O
,	O
and	O
yellow	O
.	O
</s>
<s>
Mario	B-Application
,	O
who	O
has	O
assumed	O
the	O
role	O
of	O
a	O
doctor	O
,	O
drops	O
two-colored	O
medicinal	O
capsules	O
into	O
the	O
playing	O
field	O
.	O
</s>
<s>
The	O
player	O
manipulates	O
these	O
capsules	O
as	O
they	O
fall	O
,	O
moving	O
them	O
left	O
or	O
right	O
and	O
rotating	O
them	O
such	O
that	O
they	O
become	O
aligned	O
alongside	O
viruses	B-Application
of	O
matching	O
colors	O
.	O
</s>
<s>
When	O
four	O
capsule	O
halves	O
and	O
viruses	B-Application
of	O
matching	O
color	O
are	O
joined	O
together	O
in	O
a	O
straight	O
line	O
,	O
they	O
are	O
removed	O
from	O
play	O
.	O
</s>
<s>
The	O
main	O
objective	O
of	O
the	O
game	O
therefore	O
is	O
to	O
remove	O
all	O
the	O
viruses	B-Application
from	O
the	O
playing	O
field	O
without	O
letting	O
the	O
capsules	O
themselves	O
pile	O
up	O
and	O
obstruct	O
the	O
opening	O
into	O
the	O
field	O
.	O
</s>
<s>
Successive	O
levels	O
increase	O
the	O
initial	O
number	O
of	O
viruses	B-Application
to	O
clear	O
.	O
</s>
<s>
The	O
player	O
is	O
scored	O
based	O
on	O
the	O
viruses	B-Application
cleared	O
in	O
conjunction	O
with	O
the	O
current	O
game	O
speed	O
.	O
</s>
<s>
Dr.	B-Device
Mario	I-Device
Express	I-Device
also	O
keeps	O
track	O
of	O
the	O
player	O
's	O
current	O
high	O
score	O
.	O
</s>
<s>
While	O
the	O
game	O
lacks	O
multiplayer	O
support	O
,	O
Dr.	B-Device
Mario	I-Device
Express	I-Device
offers	O
a	O
"	O
VS	O
CPU	O
"	O
mode	O
in	O
which	O
the	O
player	O
plays	O
against	O
a	O
computer-controlled	B-Application
player	I-Application
,	O
which	O
has	O
its	O
own	O
playing	O
field	O
visible	O
in	O
the	O
DSi	B-Device
top	O
screen	O
.	O
</s>
<s>
The	O
player	O
's	O
goal	O
is	O
to	O
clear	O
his	O
playing	O
field	O
of	O
all	O
the	O
viruses	B-Application
before	O
the	O
computer	B-Application
player	I-Application
does	O
.	O
</s>
<s>
The	O
player	O
will	O
win	O
the	O
game	O
upon	O
eliminating	O
all	O
the	O
viruses	B-Application
or	O
if	O
the	O
other	O
playing	O
field	O
fills	O
up	O
with	O
capsules	O
.	O
</s>
<s>
Dr.	B-Device
Mario	I-Device
Express	I-Device
received	O
generally	O
positive	O
reviews	O
,	O
gaining	O
aggregate	O
scores	O
of	O
78.33	O
%	O
and	O
76	O
on	O
GameRankings	O
and	O
Metacritic	O
.	O
</s>
<s>
Critics	O
generally	O
praised	O
the	O
gameplay	O
but	O
lamented	O
the	O
lack	O
of	O
the	O
multiplayer	O
mode	O
offered	O
in	O
earlier	O
Dr.	B-Application
Mario	I-Application
games	O
.	O
</s>
<s>
Pocket	O
Gamer	O
awarded	O
Dr.	B-Device
Mario	I-Device
Express	I-Device
7	O
out	O
of	O
10	O
along	O
with	O
a	O
Bronze	O
Award	O
.	O
</s>
<s>
Reviewer	O
Jon	O
Jordan	O
called	O
Dr.	B-Device
Mario	I-Device
Express	I-Device
"	O
a	O
great	O
puzzle	O
game	O
,	O
"	O
but	O
criticized	O
the	O
presentation	O
,	O
particularly	O
the	O
small	O
size	O
of	O
the	O
playing	O
field	O
and	O
the	O
graphics	O
,	O
which	O
he	O
felt	O
were	O
"	O
terribly	O
old	O
fashioned	O
and	O
badly	O
animated.	O
"	O
</s>
<s>
Jordan	O
ultimately	O
concluded	O
that	O
because	O
of	O
the	O
lack	O
of	O
additional	O
features	O
,	O
"	O
it	O
could	O
have	O
been	O
a	O
superb	O
addition	O
to	O
the	O
DSi	B-Device
software	O
library	O
[	O
but	O
instead ]	O
feels	O
more	O
like	O
a	O
scraping	O
from	O
the	O
barrel.	O
"	O
</s>
