<s>
was	O
a	O
2019	O
match-three	B-Application
mobile	B-Application
game	I-Application
developed	O
and	O
published	O
by	O
Nintendo	O
in	O
collaboration	O
with	O
Line	O
Corporation	O
and	O
NHN	O
Entertainment	O
.	O
</s>
<s>
Nintendo	O
officially	O
announced	O
on	O
July	O
28	O
,	O
2021	O
that	O
the	O
Dr.	B-Application
Mario	I-Application
World	I-Application
service	O
would	O
end	O
on	O
November	O
1	O
,	O
2021	O
at	O
2	O
AM	O
North	O
American	O
Eastern	O
Standard	O
Time	O
.	O
</s>
<s>
In	O
Dr.	B-Application
Mario	I-Application
World	I-Application
,	O
and	O
similar	O
to	O
prior	O
Dr.	B-Application
Mario	I-Application
games	O
,	O
the	O
player	O
removed	O
viruses	B-Application
from	O
the	O
screen	O
by	O
matching	O
their	O
colors	O
with	O
that	O
of	O
a	O
pill	O
capsule	O
.	O
</s>
<s>
The	O
player	O
oriented	O
a	O
single	O
pill	O
capsule	O
against	O
an	O
array	O
of	O
viruses	B-Application
and	O
obstacles	O
.	O
</s>
<s>
As	O
the	O
pill	O
began	O
to	O
drift	O
upwards	O
,	O
the	O
player	O
could	O
rotate	O
and	O
horizontally	O
move	O
the	O
pill	O
such	O
that	O
,	O
when	O
settled	O
,	O
the	O
pill	O
's	O
color	O
would	O
match	O
at	O
least	O
two	O
similarly	O
colored	O
viruses	B-Application
in	O
a	O
vertical	O
or	O
horizontal	O
direction	O
.	O
</s>
<s>
The	O
level	O
was	O
complete	O
when	O
all	O
viruses	B-Application
are	O
removed	O
.	O
</s>
<s>
Later	O
levels	O
added	O
additional	O
elements	O
,	O
such	O
as	O
shielded	O
viruses	B-Application
and	O
destructible	O
blocks	O
to	O
complicate	O
the	O
removal	O
of	O
viruses	B-Application
.	O
</s>
<s>
For	O
example	O
,	O
Dr.	B-Application
Mario	I-Application
could	O
remove	O
the	O
entire	O
bottom	O
row	O
on	O
the	O
game	O
screen	O
,	O
Dr.	O
Yoshi	O
removed	O
three	O
on-screen	O
items	O
at	O
random	O
,	O
and	O
Dr.	O
Peach	O
could	O
remove	O
a	O
full	O
column	O
.	O
</s>
<s>
At	O
the	O
time	O
of	O
launch	O
,	O
ten	O
playable	O
characters	O
were	O
available	O
,	O
with	O
Dr.	B-Application
Mario	I-Application
as	O
the	O
default	O
character	O
.	O
</s>
<s>
Following	O
the	O
completion	O
of	O
the	O
first	O
five	O
stages	O
,	O
the	O
player	O
could	O
choose	O
to	O
continue	O
using	O
Dr.	B-Application
Mario	I-Application
,	O
or	O
they	O
may	O
have	O
elected	O
to	O
switch	O
to	O
either	O
Dr.	O
Peach	O
or	O
Dr.	O
Bowser	O
.	O
</s>
<s>
Similar	O
to	O
other	O
mobile	O
match-three	B-Application
games	I-Application
,	O
such	O
as	O
Candy	B-Application
Crush	I-Application
,	O
the	O
game	O
was	O
monetized	O
through	O
timers	O
,	O
currencies	O
,	O
and	O
purchasable	O
digital	O
items	O
.	O
</s>
<s>
Diamonds	O
packs	O
were	O
purchased	O
in	O
exchange	O
for	O
real-world	O
money	O
through	O
the	O
app	B-Application
store	I-Application
.	O
</s>
<s>
Dr.	B-Application
Mario	I-Application
World	I-Application
required	O
a	O
constant	O
Internet	O
connection	O
.	O
</s>
<s>
The	O
game	O
was	O
released	O
for	O
Android	B-Application
and	O
iOS	B-Application
mobile	O
platforms	O
in	O
59	O
territories	O
on	O
July	O
9	O
,	O
2019	O
.	O
</s>
<s>
In	O
July	O
2021	O
,	O
Nintendo	O
announced	O
that	O
they	O
would	O
be	O
shutting	O
down	O
Dr.	B-Application
Mario	I-Application
World	I-Application
in	O
November	O
of	O
the	O
same	O
year	O
.	O
</s>
<s>
After	O
July	O
28th	O
,	O
2021	O
,	O
when	O
you	O
open	O
up	O
Dr.	B-Application
Mario	I-Application
World	I-Application
,	O
it	O
displays	O
a	O
message	O
saying	O
that	O
the	O
service	O
has	O
shut	O
down	O
.	O
</s>
<s>
The	O
game	O
received	O
"	O
mixed	O
or	O
average	O
reviews	O
"	O
,	O
according	O
to	O
review	B-Application
aggregator	I-Application
Metacritic	O
.	O
</s>
<s>
Within	O
the	O
first	O
three	O
days	O
of	O
the	O
game	O
's	O
launch	O
,	O
Dr.	B-Application
Mario	I-Application
World	I-Application
had	O
over	O
two	O
million	O
downloads	O
and	O
100,000	O
spent	O
.	O
</s>
