<s>
Adventure	B-Application
is	O
a	O
video	O
game	O
developed	O
by	O
Warren	O
Robinett	O
for	O
the	O
Atari	B-General_Concept
Video	I-General_Concept
Computer	I-General_Concept
System	I-General_Concept
(	O
later	O
renamed	O
Atari	B-General_Concept
2600	I-General_Concept
)	O
and	O
released	O
in	O
1980	B-Application
by	O
Atari	O
,	O
Inc	O
.	O
</s>
<s>
The	O
player	O
controls	O
a	O
square	O
avatar	B-Application
whose	O
quest	O
is	O
to	O
explore	O
an	O
open-ended	O
environment	O
to	O
find	O
a	O
magical	O
chalice	O
and	O
return	O
it	O
to	O
the	O
golden	O
castle	O
.	O
</s>
<s>
The	O
game	O
world	O
is	O
populated	O
by	O
roaming	O
enemies	O
:	O
three	O
dragons	O
that	O
can	O
eat	O
the	O
avatar	B-Application
and	O
a	O
bat	O
that	O
randomly	O
steals	O
and	O
hides	O
items	O
around	O
the	O
game	O
world	O
.	O
</s>
<s>
Adventure	B-Application
introduced	O
new	O
elements	O
to	O
console	O
games	O
,	O
including	O
a	O
play	O
area	O
spanning	O
multiple	O
screens	O
and	O
enemies	O
that	O
continue	O
to	O
move	O
when	O
offscreen	O
.	O
</s>
<s>
The	O
game	O
was	O
conceived	O
as	O
a	O
graphical	O
version	O
of	O
the	O
1977	O
text	O
adventure	B-Application
Colossal	B-Application
Cave	I-Application
Adventure	I-Application
.	O
</s>
<s>
Warren	O
Robinett	O
spent	O
approximately	O
one	O
year	O
designing	O
and	O
coding	O
the	O
game	O
,	O
while	O
overcoming	O
a	O
variety	O
of	O
technical	O
limitations	O
in	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
console	O
hardware	O
,	O
as	O
well	O
as	O
difficulties	O
with	O
management	O
within	O
Atari	O
.	O
</s>
<s>
Adventure	B-Application
received	O
mostly	O
positive	O
reviews	O
at	O
the	O
time	O
of	O
its	O
release	O
and	O
in	O
the	O
decades	O
since	O
,	O
often	O
named	O
as	O
one	O
of	O
the	O
industry	O
's	O
most	O
influential	O
games	O
and	O
among	O
the	O
greatest	O
video	O
games	O
of	O
all	O
time	O
.	O
</s>
<s>
It	O
is	O
considered	O
the	O
first	O
action-adventure	O
and	O
console	O
fantasy	B-Application
game	O
,	O
and	O
inspired	O
other	O
games	O
in	O
the	O
genres	O
.	O
</s>
<s>
More	O
than	O
one	B-Application
million	I-Application
cartridges	I-Application
of	O
Adventure	B-Application
were	O
sold	O
,	O
and	O
the	O
game	O
has	O
been	O
included	O
in	O
numerous	O
Atari	B-General_Concept
2600	I-General_Concept
game	O
collections	O
for	O
modern	O
computer	O
hardware	O
.	O
</s>
<s>
The	O
game	O
's	O
prototype	O
code	O
was	O
used	O
as	O
the	O
basis	O
for	O
the	O
1979	O
Superman	B-Application
game	O
,	O
and	O
a	O
planned	O
sequel	O
eventually	O
formed	O
the	O
basis	O
for	O
the	O
Swordquest	B-Application
games	O
.	O
</s>
<s>
In	O
Adventure	B-Application
,	O
the	O
player	O
's	O
goal	O
is	O
to	O
recover	O
the	O
Enchanted	O
Chalice	O
that	O
an	O
evil	O
magician	O
has	O
stolen	O
and	O
hidden	O
in	O
the	O
kingdom	O
and	O
return	O
it	O
to	O
the	O
Golden	O
Castle	O
.	O
</s>
<s>
The	O
kingdom	O
is	O
guarded	O
by	O
three	O
dragonsthe	O
yellow	O
Yorgle	O
,	O
the	O
green	O
Grundle	O
,	O
and	O
the	O
red	O
Rhindlethat	O
protect	O
or	O
flee	O
from	O
various	O
items	O
and	O
attack	O
the	O
player	O
's	O
avatar	B-Application
.	O
</s>
<s>
The	O
player	O
's	O
avatar	B-Application
is	O
a	O
simple	O
square	O
shape	O
that	O
can	O
move	O
within	O
and	O
between	O
rooms	O
,	O
each	O
represented	O
by	O
a	O
single	O
screen	O
.	O
</s>
<s>
If	O
eaten	O
by	O
a	O
dragon	O
,	O
the	O
player	O
can	O
then	O
opt	O
to	O
resurrect	O
the	O
dead	O
avatar	B-Application
instead	O
of	O
completely	O
restarting	O
the	O
game	O
.	O
</s>
<s>
The	O
avatar	B-Application
reappears	O
at	O
the	O
Golden	O
Castle	O
and	O
all	O
objects	O
remain	O
at	O
their	O
latest	O
location	O
,	O
but	O
all	O
slain	O
dragons	O
are	O
resurrected	O
.	O
</s>
<s>
The	O
ability	O
to	O
resurrect	O
the	O
avatar	B-Application
without	O
resetting	O
the	O
entire	O
game	O
is	O
considered	O
one	O
of	O
the	O
earliest	O
examples	O
of	O
a	O
"	O
continue	O
game	O
"	O
option	O
in	O
video	O
games	O
.	O
</s>
<s>
The	O
player	O
can	O
use	O
the	O
difficulty	O
switches	O
on	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
to	O
further	O
control	O
the	O
game	O
's	O
difficulty	O
;	O
one	O
switch	B-Application
controls	O
the	O
dragons	O
 '	O
bite	O
speed	O
,	O
and	O
one	O
causes	O
them	O
to	O
flee	O
when	O
the	O
player	O
carries	O
the	O
sword	O
.	O
</s>
<s>
Adventure	B-Application
was	O
designed	O
and	O
programmed	O
by	O
Atari	O
employee	O
Warren	O
Robinett	O
,	O
and	O
published	O
by	O
Atari	O
,	O
Inc	O
.	O
At	O
the	O
time	O
,	O
Atari	O
programmers	O
were	O
generally	O
given	O
full	O
control	O
on	O
the	O
creative	O
direction	O
and	O
development	O
cycle	O
for	O
their	O
games	O
,	O
and	O
this	O
required	O
them	O
to	O
plan	O
for	O
their	O
next	O
game	O
as	O
they	O
neared	O
completion	O
of	O
their	O
current	O
one	O
to	O
stay	O
productive	O
.	O
</s>
<s>
Robinett	O
was	O
finishing	O
his	O
work	O
on	O
Slot	B-Application
Racers	I-Application
when	O
he	O
was	O
given	O
an	O
opportunity	O
to	O
visit	O
the	O
Stanford	O
Artificial	O
Intelligence	O
Laboratory	O
by	O
Julius	O
Smith	O
,	O
one	O
of	O
several	O
friends	O
he	O
was	O
sharing	O
a	O
house	O
with	O
.	O
</s>
<s>
There	O
,	O
he	O
was	O
introduced	O
to	O
the	O
1977	O
version	O
of	O
the	O
computer	O
text	O
game	O
Colossal	B-Application
Cave	I-Application
Adventure	I-Application
,	O
created	O
by	O
Will	O
Crowther	O
and	O
modified	O
by	O
Don	O
Woods	O
.	O
</s>
<s>
He	O
was	O
soon	O
aware	O
that	O
memory	O
use	O
was	O
critical	O
because	O
Atari	B-General_Concept
2600	I-General_Concept
cartridge	O
ROMs	O
have	O
only	O
4096	O
bytes	B-Application
(	O
4	O
KB	O
)	O
,	O
and	O
the	O
system	O
has	O
128	O
bytes	B-Application
of	O
RAM	B-Architecture
for	O
program	O
variables	O
.	O
</s>
<s>
In	O
contrast	O
,	O
Colossal	B-Application
Cave	I-Application
Adventure	I-Application
uses	O
hundreds	O
of	O
kilobytes	O
of	O
memory	O
on	O
a	O
large	O
computer	O
.	O
</s>
<s>
The	O
final	O
game	O
uses	O
nearly	O
all	O
of	O
the	O
available	O
memory	O
(	O
including	O
5%	O
of	O
the	O
cartridge	O
storage	O
for	O
Robinett	O
's	O
Easter	O
egg	O
)	O
,	O
with	O
15	O
unused	O
bytes	B-Application
from	O
the	O
ROM	B-Device
capacity	O
.	O
</s>
<s>
Thompson	O
had	O
required	O
his	O
students	O
to	O
learn	O
the	O
C	B-Language
programming	I-Language
language	I-Language
that	O
he	O
had	O
invented	O
at	O
AT&T	O
,	O
and	O
Robinett	O
carried	O
C	B-Language
techniques	O
into	O
assembly	O
language	O
.	O
</s>
<s>
Robinett	O
first	O
identified	O
ways	O
to	O
translate	O
the	O
elements	O
of	O
Colossal	B-Application
Cave	I-Application
Adventure	I-Application
into	O
simple	O
,	O
easily	O
recognizable	O
graphics	O
that	O
the	O
player	O
interacts	O
with	O
directly	O
,	O
replacing	O
text-based	O
commands	O
with	O
joystick	O
controls	O
.	O
</s>
<s>
Due	O
to	O
the	O
system	O
's	O
low	O
resolution	O
pixels	O
,	O
Robinett	O
noted	O
the	O
dragons	O
look	O
more	O
like	O
ducks	B-Application
.	O
</s>
<s>
Robinett	O
developed	O
workarounds	B-Application
for	O
various	O
technical	O
limitations	O
of	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
,	O
which	O
has	O
only	O
one	O
playfield	O
and	O
five	O
memory-mapped	O
registers	O
available	O
to	O
represent	O
moving	O
objects	O
.	O
</s>
<s>
He	O
used	O
the	O
register	O
originally	O
designated	O
for	O
the	O
ball	O
in	O
games	O
such	O
as	O
Pong	B-Application
to	O
represent	O
the	O
player	O
's	O
avatar	B-Application
.	O
</s>
<s>
The	O
exceptions	O
include	O
two	O
screens	O
in	O
the	O
Black	O
Castle	O
catacombs	B-Application
and	O
two	O
in	O
the	O
main	O
hallway	O
beneath	O
the	O
Golden	O
Castle	O
.	O
</s>
<s>
Around	O
the	O
time	O
of	O
Adventures	B-Application
development	O
,	O
Atari	O
,	O
now	O
owned	O
by	O
Warner	O
Communications	O
,	O
had	O
hired	O
Ray	O
Kassar	O
as	O
general	O
manager	O
of	O
their	O
Consumer	O
Division	O
,	O
and	O
he	O
was	O
later	O
promoted	O
to	O
president	O
and	O
CEO	O
of	O
Atari	O
in	O
December	O
1978	O
.	O
</s>
<s>
Robinett	O
was	O
initially	O
discouraged	O
from	O
working	O
on	O
Adventure	B-Application
by	O
his	O
supervisor	O
,	O
George	O
Simcock	O
,	O
who	O
said	O
the	O
ambitious	O
game	O
could	O
not	O
be	O
done	O
on	O
Atari	B-General_Concept
2600	I-General_Concept
based	O
on	O
knowing	O
how	O
much	O
memory	O
Colossal	B-Application
Cave	I-Application
Adventure	I-Application
uses	O
.	O
</s>
<s>
The	O
management	O
later	O
tried	O
to	O
convince	O
Robinett	O
to	O
make	O
it	O
a	O
tie-in	O
work	O
for	O
the	O
upcoming	O
Superman	B-Application
movie	O
,	O
which	O
was	O
owned	O
by	O
Warner	O
Communication	O
,	O
but	O
Robinett	O
remained	O
committed	O
to	O
his	O
initial	O
idea	O
.	O
</s>
<s>
Instead	O
,	O
Atari	O
developer	O
John	O
Dunn	O
agreed	O
to	O
take	O
Robinett	O
's	O
prototype	O
source	O
code	O
to	O
make	O
the	O
1979	O
Superman	B-Application
game	O
.	O
</s>
<s>
Two	O
changes	O
were	O
the	O
possibility	O
of	O
being	O
eaten	O
by	O
the	O
dragon	O
and	O
resetting	O
the	O
avatar	B-Application
,	O
and	O
the	O
addition	O
of	O
the	O
sword	O
object	O
with	O
which	O
to	O
kill	O
the	O
dragon	O
.	O
</s>
<s>
To	O
develop	O
the	O
plot	O
for	O
the	O
game	O
,	O
Robinett	O
worked	O
with	O
Steve	O
Harding	O
,	O
the	O
author	O
for	O
nearly	O
all	O
Atari	B-General_Concept
2600	I-General_Concept
game	O
manuals	O
at	O
that	O
time	O
.	O
</s>
<s>
Robinett	O
submitted	O
the	O
source	O
code	O
for	O
Adventure	B-Application
to	O
Atari	O
management	O
in	O
June	O
1979	O
and	O
soon	O
left	O
Atari	O
.	O
</s>
<s>
Atari	O
released	O
the	O
game	O
in	O
early	O
1980	B-Application
.	O
</s>
<s>
Generally	O
defined	O
as	O
a	O
"	O
message	O
,	O
trick	O
,	O
or	O
unusual	O
behavior	O
hidden	O
inside	O
a	O
computer	O
program	O
by	O
its	O
creator	O
"	O
,	O
the	O
Easter	O
egg	O
concept	O
was	O
popularized	O
by	O
Adventure	B-Application
,	O
influenced	O
by	O
the	O
corporate	O
culture	O
at	O
Atari	O
.	O
</s>
<s>
After	O
Atari	O
's	O
acquisition	O
by	O
Warner	O
Communications	O
in	O
1976	O
,	O
there	O
was	O
a	O
culture	O
clash	B-Application
between	O
the	O
executives	O
from	O
New	O
York	O
,	O
and	O
the	O
Californian	O
programmers	O
who	O
were	O
more	O
laid	O
back	O
.	O
</s>
<s>
Unknown	O
to	O
anyone	O
else	O
,	O
Robinett	O
embedded	O
his	O
name	O
in	O
his	O
game	O
in	O
the	O
form	O
of	O
a	O
hidden	O
and	O
virtually	O
inaccessible	O
room	O
displaying	O
the	O
text	O
"	O
Created	O
by	O
Warren	O
Robinett	O
"	O
,	O
inspired	O
by	O
popular	O
rumors	O
that	O
the	B-Application
Beatles	I-Application
had	O
hidden	O
messages	O
in	O
songs	O
.	O
</s>
<s>
Furthermore	O
,	O
the	O
cost	O
of	O
creating	O
a	O
new	O
read-only	B-Device
memory	I-Device
(	O
ROM	B-Device
)	O
mask	B-Device
,	O
or	O
memory	O
chip	O
,	O
was	O
around	O
at	O
the	O
time	O
of	O
the	O
game	O
's	O
release	O
,	O
making	O
this	O
change	O
a	O
costly	O
endeavor	O
.	O
</s>
<s>
The	O
Easter	O
egg	O
is	O
accessed	O
by	O
setting	O
difficulty	O
levels	O
2	O
or	O
3	O
and	O
first	O
retrieving	O
the	O
Gray	O
Dot	O
from	O
the	O
Black	O
Castle	O
catacombs	B-Application
.	O
</s>
<s>
The	O
dot	O
is	O
a	O
single	O
pixel	O
object	O
which	O
is	O
invisibly	O
embedded	O
in	O
the	O
south	O
wall	O
of	O
a	O
sealed	O
chamber	O
accessible	O
only	O
with	O
the	O
bridge	O
,	O
and	O
the	O
player	O
must	O
bounce	O
the	O
avatar	B-Application
along	O
the	O
bottom	O
wall	O
to	O
pick	O
it	O
up	O
.	O
</s>
<s>
The	O
dot	O
can	O
be	O
seen	O
when	O
in	O
a	O
catacombs	B-Application
passage	O
or	O
when	O
held	O
over	O
a	O
normal	O
wall	O
,	O
and	O
becomes	O
again	O
invisible	O
when	O
carried	O
or	O
dropped	O
in	O
most	O
rooms	O
.	O
</s>
<s>
This	O
causes	O
the	O
barrier	O
on	O
the	O
right	O
side	O
of	O
the	O
screen	O
to	O
blink	O
rapidly	O
,	O
and	O
the	O
player	O
avatar	B-Application
is	O
then	O
able	O
to	O
push	O
through	O
the	O
wall	O
into	O
a	O
new	O
room	O
displaying	O
the	O
words	O
"	O
Created	O
by	O
Warren	O
Robinett	O
"	O
in	O
text	O
which	O
continuously	O
changes	O
color	O
.	O
</s>
<s>
Adventure	B-Application
received	O
mostly	O
positive	O
reviews	O
in	O
the	O
years	O
immediately	O
after	O
its	O
release	O
and	O
has	O
generally	O
been	O
viewed	O
positively	O
since	O
then	O
.	O
</s>
<s>
Norman	O
Howe	O
reviewed	O
Adventure	B-Application
in	O
The	O
Space	O
Gamer	O
No	O
.	O
</s>
<s>
Howe	O
commented	O
that	O
"	O
Adventure	B-Application
is	O
a	O
good	O
game	O
,	O
as	O
video	O
games	O
are	O
measured	O
.	O
</s>
<s>
It	O
is	O
neither	O
as	O
interesting	O
nor	O
as	O
complex	O
as	O
Superman	B-Application
,	O
but	O
it	O
shows	O
great	O
promise	O
for	O
things	O
to	O
come.	O
"	O
</s>
<s>
Bill	O
Kunkel	O
and	O
Frank	O
Laney	O
in	O
the	O
January	O
1981	O
issue	O
of	O
Video	O
called	O
Adventure	B-Application
a	O
"	O
major	O
design	O
breakthrough	O
"	O
and	O
that	O
it	O
"	O
shatters	O
several	O
video-game	O
conventions	O
"	O
such	O
as	O
scoring	O
and	O
time	O
limits	O
.	O
</s>
<s>
The	O
1982	O
book	O
How	O
to	O
Win	O
at	O
Home	O
Video	O
Games	O
called	O
it	O
too	O
unpredictable	O
with	O
an	O
"	O
illogical	O
mission	O
"	O
,	O
concluding	O
that	O
"	O
even	O
devoted	O
strategists	O
may	O
soon	O
tire	O
of	O
Adventures	B-Application
excessive	O
trial	O
and	O
error.	O
"	O
</s>
<s>
Electronic	O
Games	O
in	O
1983	O
stated	O
that	O
the	O
game	O
's	O
"	O
graphics	O
are	O
tame	O
stuff	O
"	O
,	O
but	O
it	O
"	O
still	O
has	O
the	O
power	O
to	O
fascinate	O
"	O
and	O
that	O
"	O
the	O
action	O
adventure	B-Application
concepts	O
introduced	O
in	O
Adventure	B-Application
are	O
still	O
viable	O
today	O
"	O
.	O
</s>
<s>
Jeremy	O
Parish	O
of	O
1UP.com	O
wrote	O
in	O
2010	O
that	O
Adventure	B-Application
is	O
"	O
a	O
work	O
of	O
interpretive	O
brilliance	O
"	O
that	O
"	O
cleverly	O
extracted	O
the	O
basic	O
elements	O
of	O
exploration	O
,	O
combat	O
and	O
treasure	O
hunting	O
from	O
the	O
text	O
games	O
and	O
converted	O
them	O
into	O
icons	O
"	O
,	O
but	O
also	O
conceded	O
that	O
it	O
"	O
seems	O
almost	O
unplayably	O
basic	O
these	O
days	O
"	O
.	O
</s>
<s>
Atari	O
Headquarters	O
scored	O
the	O
game	O
8	O
of	O
10	O
,	O
noting	O
its	O
historical	O
importance	O
while	O
panning	O
the	O
graphics	O
and	O
sound	O
,	O
concluding	O
that	O
Adventure	B-Application
was	O
"	O
very	O
enjoyable	O
"	O
regardless	O
of	O
its	O
technological	O
shortcomings	O
.	O
</s>
<s>
In	O
1995	O
,	O
Flux	O
magazine	O
ranked	O
Adventure	B-Application
35th	O
on	O
their	O
Top	O
100	O
Video	O
Games	O
.	O
</s>
<s>
As	O
the	O
first	O
action-adventure	O
video	O
game	O
and	O
first	O
console	O
fantasy	B-Application
game	O
,	O
Adventure	B-Application
established	O
its	O
namesake	O
genre	O
on	O
video	O
game	O
consoles	O
.	O
</s>
<s>
In	O
addition	O
to	O
being	O
the	O
first	O
graphical	O
adventure	B-Application
game	O
on	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
console	O
,	O
it	O
is	O
the	O
first	O
video	O
game	O
to	O
contain	O
a	O
widely	O
known	O
Easter	O
egg	O
,	O
and	O
the	O
first	O
to	O
allow	O
a	O
player	O
to	O
use	O
multiple	O
,	O
portable	O
,	O
on-screen	O
items	O
while	O
exploring	O
an	O
open-ended	O
environment	O
,	O
making	O
it	O
one	O
of	O
the	O
first	O
examples	O
,	O
even	O
as	O
small	O
and	O
primitive	O
as	O
it	O
is	O
,	O
of	O
an	O
open	O
world	O
game	O
.	O
</s>
<s>
The	O
game	O
is	O
the	O
first	O
to	O
use	O
a	O
fog	O
of	O
war	O
effect	O
in	O
its	O
catacombs	B-Application
,	O
which	O
obscures	O
most	O
of	O
the	O
playing	O
area	O
except	O
for	O
the	O
player	O
's	O
immediate	O
surroundings	O
.	O
</s>
<s>
The	O
game	O
has	O
been	O
voted	O
the	O
best	O
Atari	B-General_Concept
2600	I-General_Concept
game	O
in	O
numerous	O
polls	O
,	O
and	O
has	O
been	O
noted	O
as	O
a	O
significant	O
step	O
in	O
the	O
advancement	O
of	O
home	O
video	O
games	O
.	O
</s>
<s>
Entertainment	O
Weekly	O
named	O
Adventure	B-Application
as	O
one	O
of	O
the	O
top	O
10	O
games	O
for	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
.	O
</s>
<s>
A	O
sequel	O
to	O
Adventure	B-Application
was	O
first	O
announced	O
in	O
early	O
1982	O
.	O
</s>
<s>
The	O
planned	O
sequel	O
eventually	O
evolved	O
into	O
the	O
Swordquest	B-Application
series	O
of	O
games	O
.	O
</s>
<s>
In	O
2007	O
,	O
AtariAge	B-Application
released	O
a	O
self-published	O
sequel	O
called	O
Adventure	B-Application
II	O
for	O
the	O
Atari	B-General_Concept
5200	I-General_Concept
,	O
which	O
is	O
heavily	O
inspired	O
by	O
the	O
original	O
;	O
its	O
name	O
is	O
used	O
with	O
permission	O
from	O
Atari	O
Interactive	O
.	O
</s>
<s>
Robinett	O
himself	O
took	O
the	O
idea	O
of	O
using	O
items	O
from	O
Adventure	B-Application
into	O
his	O
next	O
game	O
,	O
Rocky	B-Device
's	I-Device
Boots	I-Device
,	O
but	O
added	O
the	O
ability	O
to	O
combine	O
them	O
to	O
form	O
new	O
items	O
.	O
</s>
<s>
In	O
both	O
the	O
2011	O
novel	O
Ready	O
Player	O
One	O
and	O
its	O
2018	O
film	O
version	O
the	O
Easter	O
egg	O
in	O
Adventure	B-Application
is	O
prominently	O
mentioned	O
as	O
the	O
inspiration	O
for	O
a	O
contest	O
to	O
find	O
an	O
Easter	O
egg	O
hidden	O
in	O
the	O
fictional	O
virtual	B-Application
reality	I-Application
game	O
OASIS	O
,	O
and	O
finding	O
the	O
secret	O
room	O
within	O
Adventure	B-Application
is	O
a	O
core	O
plot	O
element	O
within	O
both	O
versions	O
,	O
with	O
footage	O
from	O
the	O
game	O
(	O
specifically	O
the	O
Easter	O
egg	O
)	O
incorporated	O
into	O
the	O
film	O
version	O
.	O
</s>
<s>
The	O
Lego	B-Language
Atari	B-General_Concept
2600	I-General_Concept
set	O
includes	O
three	O
"	O
cartridges	O
"	O
that	O
open	O
to	O
reveal	O
scenes	O
inside	O
them	O
.	O
</s>
<s>
The	O
cartridge	O
for	O
Adventure	B-Application
has	O
a	O
scene	O
of	O
the	O
game	O
's	O
castle	O
with	O
an	O
egg	O
hidden	O
at	O
its	O
center	O
,	O
reference	O
the	O
Easter	O
egg	O
.	O
</s>
