<s>
Mr.	B-Application
Do	I-Application
's	I-Application
Castle	I-Application
is	O
a	O
platform	O
game	O
released	O
in	O
arcades	B-Application
by	O
Universal	O
in	O
September	O
1983	O
.	O
</s>
<s>
In	O
Japan	O
,	O
the	O
game	O
is	O
titled	O
Mr.	B-Application
Do	I-Application
!	I-Application
</s>
<s>
Marketed	O
as	O
a	O
sequel	O
to	O
the	O
original	O
Mr.	B-Application
Do	I-Application
!	I-Application
</s>
<s>
released	O
one	O
year	O
earlier	O
,	O
the	O
game	O
bears	O
a	O
far	O
closer	O
resemblance	O
to	O
Universal	O
's	O
Space	B-Application
Panic	I-Application
from	O
1980	O
.	O
</s>
<s>
It	O
began	O
as	O
a	O
game	O
called	O
Knights	O
vs.	O
Unicorns	O
,	O
but	O
the	O
U.S.	O
division	O
of	O
Universal	O
persuaded	O
the	O
Japanese	O
arm	O
to	O
modify	O
the	O
graphics	O
into	O
a	O
Mr.	B-Application
Do	I-Application
!	I-Application
</s>
<s>
The	O
object	O
of	O
Mr.	B-Application
Do	I-Application
's	I-Application
Castle	I-Application
is	O
to	O
score	O
as	O
many	O
points	O
as	O
possible	O
by	O
collecting	O
cherries	O
and/or	O
defeating	O
unicorn-like	O
monsters	O
.	O
</s>
<s>
The	O
game	O
takes	O
place	O
in	O
a	O
castle	O
filled	O
with	O
platforms	O
and	O
ladders	O
reminiscent	O
of	O
Space	B-Application
Panic	I-Application
(	O
1980	O
)	O
some	O
of	O
which	O
can	O
be	O
flipped	O
from	O
one	O
platform	O
to	O
another	O
,	O
much	O
like	O
a	O
kickstand	O
on	O
a	O
bicycle	O
.	O
</s>
<s>
The	O
player	O
controls	O
Mr.	B-Application
Do	I-Application
as	O
he	O
collects	O
cherries	O
by	O
using	O
a	O
hammer	O
to	O
knock	O
out	O
blocks	O
that	O
contain	O
them	O
from	O
the	O
various	O
platforms	O
.	O
</s>
<s>
The	O
player	O
loses	O
a	O
life	O
if	O
Mr.	B-Application
Do	I-Application
is	O
caught	O
by	O
a	O
monster	O
,	O
and	O
the	O
game	O
ends	O
when	O
the	O
player	O
runs	O
out	O
of	O
lives	O
.	O
</s>
<s>
The	O
cherry	O
blocks	O
are	O
absent	O
from	O
Mr.	B-Application
Do	I-Application
Vs.	O
Unicorns	O
and	O
early	O
revisions	O
of	O
Mr.	B-Application
Do	I-Application
's	I-Application
Castle	I-Application
.	O
</s>
<s>
Because	O
of	O
this	O
,	O
there	O
are	O
only	O
three	O
ways	O
to	O
complete	O
a	O
level	O
in	O
this	O
version	O
,	O
versus	O
the	O
four	O
ways	O
to	O
complete	O
levels	O
in	O
Mr.	B-Application
Do	I-Application
's	I-Application
Castle	I-Application
.	O
</s>
<s>
Mr.	B-Application
Do	I-Application
's	I-Application
Castle	I-Application
was	O
ported	O
to	O
the	O
ColecoVision	B-Device
,	O
MSX	B-Operating_System
,	O
Atari	B-General_Concept
2600	I-General_Concept
,	O
Atari	B-General_Concept
5200	I-General_Concept
,	O
Atari	B-Device
8-bit	I-Device
family	I-Device
,	O
Commodore	O
64	O
,	O
and	O
X68000	B-Device
.	O
</s>
<s>
The	O
Atari	O
,	O
Commodore	O
,	O
and	O
ColecoVision	B-Device
were	O
published	O
by	O
Parker	O
Bros	O
.	O
</s>
<s>
In	O
Japan	O
,	O
Game	O
Machine	O
listed	O
Mr.	B-Application
Do	I-Application
's	I-Application
Castle	I-Application
on	O
their	O
October	O
1	O
,	O
1983	O
issue	O
as	O
being	O
the	O
second	O
most-successful	O
new	O
table	O
arcade	B-Application
unit	O
of	O
the	O
month	O
.	O
</s>
<s>
Gene	O
Lewin	O
of	O
Play	O
Meter	O
magazine	O
reviewed	O
the	O
arcade	B-Application
game	O
,	O
scoring	O
it	O
9	O
out	O
of	O
10	O
.	O
</s>
<s>
Mr.	B-Application
Do	I-Application
's	I-Application
Castle	I-Application
was	O
followed	O
up	O
by	O
,	O
Mr.	B-Application
Do	I-Application
's	I-Application
Wild	I-Application
Ride	I-Application
and	O
Do	O
!	O
</s>
