<s>
Portal	B-Application
is	O
a	O
series	O
of	O
first-person	O
puzzle-platform	O
video	O
games	O
developed	O
by	O
Valve	O
.	O
</s>
<s>
Set	O
in	O
the	O
Half-Life	B-Application
universe	O
,	O
the	O
two	O
main	O
games	O
in	O
the	O
series	O
,	O
Portal	B-Application
(	O
2007	O
)	O
and	O
Portal	B-Application
2	I-Application
(	O
2011	O
)	O
,	O
center	O
on	O
a	O
woman	O
,	O
Chell	O
,	O
forced	O
to	O
undergo	O
a	O
series	O
of	O
tests	O
within	O
the	O
Aperture	O
Science	O
Enrichment	O
Center	O
by	O
a	O
malicious	O
artificial	B-Application
intelligence	I-Application
,	O
GLaDOS	O
,	O
that	O
controls	O
the	O
facility	O
.	O
</s>
<s>
Most	O
of	O
the	O
tests	O
involve	O
using	O
the	O
"	O
Aperture	O
Science	O
Handheld	O
Portal	B-Application
Device	O
"	O
–	O
nicknamed	O
the	O
portal	B-Application
gun	O
–	O
that	O
creates	O
a	O
human-sized	O
wormhole-like	O
connection	O
between	O
two	O
flat	O
surfaces	O
.	O
</s>
<s>
The	O
player-character	O
or	O
objects	O
in	O
the	O
game	O
world	O
may	O
move	O
through	O
portals	B-Application
while	O
conserving	O
their	O
momentum	O
.	O
</s>
<s>
The	O
Portal	B-Application
games	I-Application
are	O
noted	O
for	O
bringing	O
students	O
and	O
their	O
projects	O
from	O
the	O
DigiPen	O
Institute	O
of	O
Technology	O
into	O
Valve	O
and	O
extending	O
their	O
ideas	O
into	O
the	O
full	O
games	O
.	O
</s>
<s>
The	O
portal	B-Application
concept	O
was	O
introduced	O
by	O
the	O
game	O
Narbacular	B-Application
Drop	I-Application
and	O
led	O
to	O
the	O
basis	O
for	O
the	O
first	O
game	O
.	O
</s>
<s>
Another	O
game	O
,	O
Tag	B-Application
:	I-Application
The	I-Application
Power	I-Application
of	I-Application
Paint	I-Application
,	O
formed	O
the	O
basis	O
of	O
surface-altering	O
"	O
gels	O
"	O
introduced	O
in	O
Portal	B-Application
2	I-Application
.	O
</s>
<s>
The	O
first	O
game	O
was	O
released	O
as	O
part	O
of	O
a	O
five-game	O
compilation	O
,	O
The	B-Application
Orange	I-Application
Box	I-Application
,	O
and	O
though	O
intended	O
as	O
a	O
short	O
bonus	O
feature	O
of	O
the	O
compilation	O
,	O
was	O
instead	O
considered	O
the	O
highlight	O
of	O
the	O
five	O
.	O
</s>
<s>
Its	O
success	O
led	O
to	O
the	O
creation	O
of	O
the	O
much	O
longer	O
Portal	B-Application
2	I-Application
,	O
which	O
included	O
both	O
single	O
player	O
and	O
cooperative	O
player	O
modes	O
;	O
it	O
too	O
received	O
near-universal	O
critical	O
acclaim	O
.	O
</s>
<s>
Both	O
Portal	B-Application
games	I-Application
take	O
place	O
in	O
the	O
fictional	O
"	O
Aperture	O
Science	O
Enrichment	O
Center	O
"	O
.	O
</s>
<s>
Its	O
research	O
happened	O
upon	O
the	O
discovery	O
of	O
portal	B-Application
technology	O
,	O
and	O
soon	O
became	O
a	O
direct	O
competitor	O
with	O
Black	O
Mesa	O
Research	O
Facility	O
(	O
from	O
the	O
Half-Life	B-Application
series	O
)	O
for	O
government	O
funding	O
.	O
</s>
<s>
During	O
this	O
time	O
,	O
Johnson	O
became	O
poisoned	O
from	O
exposure	O
to	O
moon	O
dust	O
,	O
a	O
key	O
component	O
of	O
the	O
paint	O
needed	O
for	O
the	O
portal	B-Application
placing	O
technology	O
,	O
and	O
became	O
increasingly	O
deranged	O
.	O
</s>
<s>
In	O
Portal	B-Application
2	I-Application
,	O
the	O
player	O
explores	O
these	O
long-abandoned	O
areas	O
of	O
Aperture	O
,	O
learning	O
that	O
the	O
company	O
had	O
moved	O
from	O
testing	O
on	O
the	O
country	O
's	O
finest	O
,	O
to	O
paid	O
volunteers	O
,	O
and	O
ultimately	O
to	O
forcing	O
its	O
own	O
employees	O
to	O
participate	O
in	O
testing	O
.	O
</s>
<s>
In	O
the	O
games	O
and	O
the	O
comic	O
Lab	O
Rat	O
,	O
one	O
employee	O
Doug	O
Rattmann	O
survived	O
due	O
to	O
his	O
schizophrenia	B-Application
and	O
distrust	O
of	O
GLaDOS	O
.	O
</s>
<s>
In	O
trying	O
to	O
find	O
a	O
way	O
to	O
defeat	O
GLaDOS	O
,	O
he	O
finds	O
that	O
Chell	O
,	O
one	O
of	O
the	O
human	O
subjects	O
kept	O
in	O
cryogenic	O
storage	O
within	O
Aperture	O
,	O
has	O
a	O
high	O
level	O
of	O
tenacity	O
,	O
and	O
arranges	O
for	O
the	O
events	O
of	O
Portal	B-Application
to	O
occur	O
by	O
moving	O
her	O
to	O
the	O
top	O
of	O
GLaDOS	O
 '	O
testing	O
list	O
.	O
</s>
<s>
The	O
player	O
is	O
introduced	O
to	O
Aperture	O
in	O
Portal	B-Application
,	O
which	O
is	O
said	O
by	O
Valve	O
to	O
be	O
set	O
sometime	O
between	O
the	O
events	O
of	O
Half-Life	B-Application
and	O
Half-Life	B-Application
2	I-Application
.	O
</s>
<s>
Chell	O
resists	O
GLaDOS	O
 '	O
lies	O
and	O
verbal	O
ploys	O
and	O
succeeds	O
to	O
defeat	O
GLaDOS	O
 '	O
core	O
,	O
the	O
destruction	O
creating	O
a	O
portal	B-Application
implosion	O
that	O
sends	O
Chell	O
to	O
the	O
surface	O
,	O
unconscious	O
.	O
</s>
<s>
Portal	B-Application
2	I-Application
takes	O
place	O
numerous	O
years	O
after	O
the	O
events	O
of	O
the	O
first	O
game	O
;	O
the	O
Aperture	O
facility	O
has	O
fallen	O
into	O
disrepair	O
without	O
GLaDOS	O
.	O
</s>
<s>
In	O
Portal	B-Application
2	I-Application
,	O
three	O
more	O
such	O
cores	O
(	O
beyond	O
Wheatley	O
)	O
are	O
introduced	O
including	O
the	O
irrelevant	O
Fact	O
Core	O
,	O
the	O
bold	O
Adventure	O
Core	O
,	O
and	O
the	O
space-obsessed	O
Space	O
Core	O
,	O
each	O
voiced	O
by	O
North	O
.	O
</s>
<s>
These	O
puzzles	O
require	O
the	O
use	O
of	O
the	O
Aperture	O
Science	O
Handheld	O
Portal	B-Application
Device	O
,	O
the	O
portal	B-Application
gun	O
.	O
</s>
<s>
The	O
gun	O
can	O
shoot	O
two	O
portals	B-Application
,	O
colored	O
differently	O
for	O
identification	O
,	O
on	O
any	O
flat	O
surface	O
that	O
is	O
painted	O
with	O
a	O
specific	O
paint	O
containing	O
moon	O
dust	O
.	O
</s>
<s>
Once	O
both	O
portal	B-Application
ends	O
are	O
placed	O
,	O
the	O
player	O
can	O
walk	O
the	O
character	O
between	O
them	O
,	O
or	O
carry	O
objects	O
with	O
the	O
portal	B-Application
gun	O
through	O
them	O
.	O
</s>
<s>
Portal	B-Application
ends	O
can	O
be	O
re	O
positioned	O
as	O
often	O
as	O
necessary	O
,	O
but	O
certain	O
actions	O
,	O
such	O
as	O
walking	O
through	O
"	O
emancipation	O
grills	O
"	O
or	O
moving	O
a	O
surface	O
with	O
a	O
portal	B-Application
will	O
cause	O
the	O
portals	B-Application
to	O
dissipate	O
.	O
</s>
<s>
A	O
critical	O
feature	O
of	O
portals	B-Application
is	O
that	O
they	O
retain	O
the	O
magnitude	O
of	O
momentum	O
when	O
an	O
object	O
travels	O
through	O
it	O
;	O
as	O
stated	O
by	O
GLaDOS	O
to	O
the	O
player	O
in	O
the	O
first	O
game	O
,	O
"	O
Speedy	O
thing	O
goes	O
in	O
,	O
speedy	O
thing	O
comes	O
out	O
"	O
.	O
</s>
<s>
When	O
portals	B-Application
are	O
placed	O
on	O
non-parallel	O
planes	O
,	O
this	O
can	O
create	O
the	O
effect	O
of	O
"	O
flinging	O
"	O
.	O
</s>
<s>
Commonly	O
,	O
one	O
uses	O
gravity	O
to	O
build	O
up	O
their	O
momentum	O
when	O
they	O
fall	O
into	O
a	O
portal	B-Application
,	O
which	O
flings	O
them	O
out	O
of	O
the	O
other	O
side	O
to	O
gain	O
speed	O
and	O
distance	O
that	O
normal	O
jumping	O
and	O
running	O
could	O
not	O
generate	O
.	O
</s>
<s>
A	O
leapfrogging	O
effect	O
can	O
be	O
used	O
by	O
placing	O
portals	B-Application
in	O
series	O
during	O
this	O
flinging	O
,	O
gaining	O
further	O
momentum	O
with	O
each	O
use	O
.	O
</s>
<s>
Portals	B-Application
will	O
also	O
allow	O
light	O
and	O
other	O
objects	O
to	O
transfer	O
through	O
them	O
,	O
and	O
numerous	O
puzzles	O
involve	O
using	O
portals	B-Application
to	O
manipulate	O
bouncing	O
energy	O
balls	O
,	O
lasers	O
,	O
"	O
hard	O
light	O
"	O
bridges	O
,	O
and	O
tractor	O
beams	O
to	O
access	O
new	O
locations	O
or	O
direct	O
objects	O
to	O
specific	O
receptacles	O
that	O
must	O
be	O
activated	O
to	O
open	O
the	O
level	O
's	O
exit	O
.	O
</s>
<s>
Portal	B-Application
2	I-Application
introduces	O
"	O
mobility	O
gels	O
"	O
that	O
can	O
paint	O
surfaces	O
,	O
including	O
turrets	O
and	O
cubes	O
,	O
that	O
can	O
also	O
move	O
through	O
portals	B-Application
though	O
not	O
directly	O
by	O
the	O
player	O
.	O
</s>
<s>
The	O
gels	O
can	O
create	O
a	O
surface	O
that	O
repels	O
the	O
player	O
(	O
Repulsion	O
Gel	O
)	O
,	O
increases	O
the	O
player	O
's	O
speed	O
(	O
Propulsion	O
Gel	O
)	O
,	O
or	O
allows	O
the	O
surface	O
to	O
accept	O
portals	B-Application
(	O
Conversion	O
Gel	O
)	O
.	O
</s>
<s>
The	O
concept	O
of	O
Portal	B-Application
came	O
from	O
Narbacular	B-Application
Drop	I-Application
,	O
a	O
student	O
project	O
from	O
the	O
DigiPen	O
Institute	O
of	O
Technology	O
.	O
</s>
<s>
The	O
game	O
included	O
the	O
aspects	O
of	O
placing	O
portals	B-Application
on	O
any	O
flat	O
surfaces	O
and	O
using	O
them	O
to	O
maneuver	O
around	O
levels	O
.	O
</s>
<s>
Valve	O
originally	O
saw	O
Portal	B-Application
as	O
an	O
experimental	O
game	O
to	O
be	O
included	O
with	O
its	O
upcoming	O
compilation	O
,	O
The	B-Application
Orange	I-Application
Box	I-Application
,	O
alongside	O
its	O
release	O
of	O
Half-Life	B-Application
2	I-Application
:	I-Application
Episode	I-Application
Two	I-Application
and	O
Team	B-Application
Fortress	I-Application
2	I-Application
.	O
</s>
<s>
To	O
give	O
the	O
game	O
character	O
,	O
a	O
minimal	O
story	O
,	O
tied	O
loosely	O
with	O
the	O
Half-Life	B-Application
world	O
,	O
was	O
written	O
by	O
Valve	O
's	O
Erik	O
Wolpaw	O
and	O
Marc	O
Laidlaw	O
.	O
</s>
<s>
They	O
needed	O
a	O
character	O
to	O
guide	O
the	O
player	O
through	O
the	O
game	O
,	O
coming	O
onto	O
a	O
polite	O
but	O
humorous	O
artificial	B-Application
intelligence	I-Application
,	O
which	O
would	O
ultimately	O
become	O
the	O
character	O
of	O
GLaDOS	O
.	O
</s>
<s>
Portals	B-Application
release	O
with	O
The	B-Application
Orange	I-Application
Box	I-Application
received	O
near-universal	O
praise	O
,	O
with	O
the	O
standalone	O
game	O
earning	O
an	O
aggregate	O
Metacritic	O
rating	O
of	O
90	O
out	O
of	O
100	O
.	O
</s>
<s>
Initial	O
ideas	O
for	O
Portal	B-Application
2	I-Application
retained	O
the	O
idea	O
of	O
solving	O
puzzles	O
through	O
scientific	O
concepts	O
,	O
but	O
eliminating	O
the	O
use	O
of	O
portals	B-Application
altogether	O
;	O
these	O
versions	O
did	O
not	O
fare	O
well	O
with	O
test	O
audiences	O
nor	O
with	O
Gabe	O
Newell	O
,	O
Valve	O
's	O
president	O
;	O
these	O
ideas	O
were	O
dropped	O
though	O
saved	O
for	O
potential	O
reuse	O
in	O
a	O
different	O
game	O
by	O
Valve	O
.	O
</s>
<s>
Portal	B-Application
2	I-Application
development	O
was	O
restarted	O
specifically	O
to	O
keep	O
the	O
portal	B-Application
concept	O
but	O
adding	O
new	O
elements	O
to	O
freshen	O
the	O
gameplay	O
.	O
</s>
<s>
During	O
this	O
period	O
,	O
Valve	O
had	O
witnessed	O
another	O
student	O
project	O
out	O
of	O
Digipen	O
,	O
Tag	B-Application
:	I-Application
The	I-Application
Power	I-Application
of	I-Application
Paint	I-Application
which	O
allows	O
the	O
player	O
to	O
spray	O
paint	O
onto	O
surfaces	O
to	O
alter	O
their	O
behavior	O
,	O
and	O
brought	O
them	O
into	O
Valve	O
,	O
though	O
not	O
initially	O
as	O
part	O
of	O
the	O
Portal	B-Application
.	O
</s>
<s>
The	O
Tag	O
team	O
had	O
found	O
a	O
way	O
to	O
incorporate	O
their	O
paints	O
with	O
real-time	O
fluid	O
dynamics	O
code	O
previously	O
made	O
by	O
Valve	O
,	O
and	O
soon	O
their	O
concept	O
for	O
paints	O
had	O
become	O
the	O
"	O
conversion	O
gels	O
"	O
as	O
part	O
of	O
Portal	B-Application
2	I-Application
.	O
</s>
<s>
Valve	O
included	O
a	O
co-operative	O
play	O
mode	O
,	O
based	O
on	O
their	O
own	O
observations	O
and	O
stories	O
from	O
players	O
about	O
working	O
out	O
the	O
solutions	O
to	O
Portals	B-Application
puzzles	O
in	O
a	O
group	O
environment	O
.	O
</s>
<s>
With	O
this	O
feature	O
,	O
they	O
sought	O
the	O
ability	O
to	O
enable	O
cross-platform	O
play	O
of	O
Portal	B-Application
2	I-Application
between	O
computers	O
and	O
consoles	O
through	O
Steamworks	O
.	O
</s>
<s>
This	O
led	O
to	O
a	O
surprise	O
reveal	O
by	O
Newell	O
that	O
not	O
only	O
would	O
Portal	B-Application
2	I-Application
be	O
on	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
platform	O
,	O
after	O
previously	O
stating	O
the	O
difficulties	O
in	O
supporting	O
this	O
console	O
,	O
but	O
that	O
it	O
would	O
include	O
support	O
for	O
cross-platform	O
play	O
between	O
personal	O
computers	O
and	O
PlayStation	B-Operating_System
3	I-Operating_System
players	O
through	O
a	O
limited	O
Steamworks	O
interface	O
.	O
</s>
<s>
Valve	O
brought	O
in	O
writer	O
Jay	O
Pinkerton	O
formerly	O
with	O
National	O
Lampoon	O
,	O
and	O
Left	B-Application
4	I-Application
Dead	I-Application
writer	O
Chet	O
Faliszek	O
to	O
assist	O
Wolpaw	O
with	O
the	O
larger	O
story	O
.	O
</s>
<s>
Portal	B-Application
2	I-Application
was	O
similarly	O
released	O
with	O
high	O
praise	O
with	O
a	O
95	O
out	O
of	O
100	O
score	O
on	O
Metacritic	O
.	O
</s>
<s>
Valve	O
has	O
continued	O
to	O
support	O
the	O
game	O
through	O
the	O
release	O
of	O
two	O
separate	O
downloadable	B-Protocol
content	I-Protocol
packages	O
,	O
one	O
introducing	O
a	O
new	O
co-operative	O
campaign	O
,	O
and	O
a	O
second	O
that	O
incorporated	O
an	O
easy-to-learn	O
level	O
editor	O
that	O
allowed	O
players	O
to	O
make	O
their	O
own	O
test	O
chambers	O
and	O
share	O
these	O
through	O
the	O
Steam	O
Workshop	O
to	O
others	O
.	O
</s>
<s>
Further	O
on	O
this	O
,	O
Valve	O
has	O
created	O
a	O
special	O
version	O
of	O
the	O
Portal	B-Application
level	O
editor	O
to	O
be	O
used	O
alongside	O
its	O
"	O
Steam	O
in	O
Schools	O
"	O
program	O
as	O
a	O
means	O
of	O
using	O
the	O
game	O
and	O
editor	O
to	O
teach	O
students	O
about	O
physics	O
,	O
math	O
,	O
and	O
other	O
lessons	O
;	O
Valve	O
released	O
this	O
version	O
of	O
Portal	B-Application
2	I-Application
free	O
for	O
educational	O
use	O
.	O
</s>
<s>
Exploring	O
options	O
for	O
a	O
full-scale	O
VR	O
game	O
in	O
2017	O
,	O
Valve	O
experimented	O
with	O
Portal	B-Application
,	O
but	O
found	O
the	O
portal	B-Application
systems	O
disorienting	O
in	O
VR	O
;	O
instead	O
,	O
they	O
returned	O
to	O
the	O
Half-Life	B-Application
series	O
and	O
released	O
Half-Life	B-Application
:	I-Application
Alyx	I-Application
in	O
2020	O
.	O
</s>
<s>
In	O
April	O
2022	O
,	O
Erik	O
Wolpaw	O
urged	O
Valve	O
to	O
make	O
Portal	B-Application
3	O
saying	O
"	O
I	O
am	O
also	O
not	O
getting	O
any	O
younger	O
.	O
</s>
<s>
We	O
are	O
reaching	O
the	O
point	O
where	O
-	O
it	O
's	O
crazy	O
to	O
think	O
–	O
[	O
we	O
're	O
]	O
literally	O
going	O
to	O
be	O
too	O
old	O
to	O
work	O
on	O
Portal	B-Application
3	O
.	O
</s>
<s>
In	O
September	O
,	O
Ellen	O
McLain	O
also	O
called	O
for	O
Portal	B-Application
3	O
saying	O
she	O
was	O
willing	O
to	O
star	O
in	O
it	O
and	O
asked	O
fans	O
to	O
:	O
"	O
Write	O
in	O
.	O
</s>
<s>
Portal	B-Application
was	O
initially	O
released	O
in	O
October	O
2007	O
as	O
part	O
of	O
a	O
compilation	O
game	O
called	O
The	B-Application
Orange	I-Application
Box	I-Application
,	O
alongside	O
Half-Life	B-Application
2	I-Application
and	O
its	O
two	O
episodes	O
and	O
Team	B-Application
Fortress	I-Application
2	I-Application
.	O
</s>
<s>
Valve	O
considered	O
including	O
Portal	B-Application
as	O
a	O
bonus	O
feature	O
of	O
the	O
compilation	O
;	O
the	O
game	O
was	O
purposely	O
kept	O
short	O
such	O
that	O
if	O
it	O
did	O
not	O
meet	O
expectations	O
,	O
players	O
would	O
have	O
the	O
rest	O
of	O
the	O
content	O
of	O
The	B-Application
Orange	I-Application
Box	I-Application
as	O
a	O
"	O
safety	O
net	O
"	O
.	O
</s>
<s>
Portal	B-Application
has	O
since	O
been	O
repackaged	O
on	O
Windows	O
as	O
a	O
standalone	O
game	O
in	O
April	O
2008	O
.	O
</s>
<s>
A	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
client	O
was	O
introduced	O
simultaneously	O
with	O
the	O
release	O
of	O
the	O
Steam	O
client	O
for	O
that	O
platform	O
in	O
May	O
2010	O
;	O
as	O
part	O
of	O
its	O
promotion	O
,	O
the	O
game	O
was	O
released	O
free	O
of	O
charge	O
for	O
both	O
platforms	O
during	O
which	O
at	O
least	O
1.5	O
million	O
players	O
downloaded	O
it	O
.	O
</s>
<s>
Portal	B-Application
:	O
Still	O
Alive	O
was	O
a	O
standalone	O
version	O
of	O
Portal	B-Application
with	O
additional	O
content	O
for	O
the	O
Xbox	B-Device
Live	I-Device
Arcade	I-Device
,	O
released	O
in	O
October	O
2008	O
.	O
</s>
<s>
The	O
game	O
included	O
new	O
achievements	O
,	O
additional	O
challenges	O
from	O
the	O
existing	O
test	O
chambers	O
,	O
and	O
additional	O
non-story	O
levels	O
based	O
on	O
those	O
found	O
in	O
the	O
Flash-based	O
Portal	B-Application
:	O
The	O
Flash	B-Operating_System
Version	O
created	O
by	O
We	O
Create	O
Stuff	O
.	O
</s>
<s>
Portal	B-Application
2	I-Application
was	O
released	O
as	O
a	O
standalone	O
game	O
in	O
April	O
2011	O
on	O
both	O
computers	O
and	O
consoles	O
.	O
</s>
<s>
It	O
received	O
acclaim	O
for	O
its	O
gameplay	O
,	O
pacing	O
,	O
dark	O
humor	O
,	O
writing	O
,	O
the	O
voice	O
work	O
of	O
McLain	O
,	O
Merchant	O
,	O
and	O
Simmons	O
,	O
and	O
its	O
challenging	O
but	O
surmountable	O
learning	B-General_Concept
curve	I-General_Concept
.	O
</s>
<s>
Portal	B-Application
:	O
Companion	O
Collection	O
is	O
a	O
compilation	O
of	O
both	O
games	O
and	O
Still	O
Alive	O
content	O
released	O
for	O
Nintendo	B-Application
Switch	I-Application
on	O
June	O
28	O
,	O
2022	O
.	O
</s>
<s>
In	O
September	O
2022	O
,	O
Nvidia	O
announced	O
it	O
would	O
release	O
an	O
updated	O
version	O
of	O
Portal	B-Application
with	O
real-time	B-Algorithm
ray	I-Algorithm
tracing	I-Algorithm
,	O
as	O
a	O
free	O
DLC	B-Protocol
for	O
owners	O
of	O
the	O
original	O
game	O
on	O
PC	O
.	O
</s>
<s>
It	O
is	O
a	O
tech	O
demo	O
set	O
in	O
the	O
Portal	B-Application
universe	O
that	O
showcases	O
the	O
functions	O
of	O
the	O
hand	O
,	O
knuckle	O
,	O
and	O
finger	O
tracking	O
technology	O
used	O
by	O
the	O
Valve	B-Device
Index	I-Device
.	O
</s>
<s>
The	O
Lab	O
is	O
a	O
VR	O
game	O
developed	O
by	O
Valve	O
that	O
as	O
part	O
of	O
its	O
partnership	O
with	O
HTC	B-Application
and	O
the	O
VR	O
headset	O
,	O
the	O
HTC	B-Application
Vive	O
.	O
</s>
<s>
The	O
Lab	O
was	O
announced	O
at	O
the	O
2016	O
Game	O
Developers	O
Conference	O
,	O
and	O
was	O
released	O
free	O
on	O
April	O
5	O
,	O
2016	O
,	O
following	O
the	O
public	O
release	O
of	O
the	O
HTC	B-Application
Vive	O
.	O
</s>
<s>
Aperture	O
Desk	O
Job	O
is	O
a	O
free	O
game	O
set	O
in	O
the	O
Portal	B-Application
universe	O
released	O
on	O
March	O
1	O
,	O
2022	O
.	O
</s>
<s>
It	O
is	O
a	O
demonstration	O
of	O
the	O
various	O
features	O
of	O
the	O
Steam	B-Device
Deck	I-Device
handheld	O
system	O
.	O
</s>
<s>
Valve	O
licensed	O
the	O
use	O
of	O
Portal	B-Application
to	O
Headup	O
Games	O
and	O
Clockstone	O
Software	O
,	O
the	O
developers	O
of	O
Bridge	O
Constructor	O
,	O
to	O
develop	O
Bridge	O
Constructor	O
Portal	B-Application
.	O
</s>
<s>
Bridge	O
Constructor	O
Portal	B-Application
adds	O
in	O
elements	O
from	O
the	O
Portal	B-Application
series	O
,	O
such	O
as	O
portals	B-Application
,	O
as	O
part	O
of	O
the	O
construction	O
challenge	O
.	O
</s>
<s>
The	O
game	O
released	O
on	O
December	O
20	O
,	O
2017	O
,	O
for	O
personal	O
computers	O
and	O
mobile	O
devices	O
,	O
and	O
later	O
in	O
2018	O
for	O
PlayStation	B-Operating_System
4	I-Operating_System
,	O
Xbox	B-Device
One	I-Device
,	O
and	O
Nintendo	B-Application
Switch	I-Application
consoles	O
.	O
</s>
<s>
The	O
comic	O
,	O
"	O
Portal	B-Application
2	I-Application
:	O
Lab	O
Rat	O
"	O
,	O
takes	O
place	O
both	O
during	O
and	O
after	O
Portal	B-Application
,	O
explaining	O
the	O
events	O
that	O
led	O
to	O
Portal	B-Application
2	I-Application
.	O
</s>
<s>
The	O
Rat	O
Man	O
's	O
artwork	O
appears	O
early	O
in	O
Portal	B-Application
2	I-Application
,	O
where	O
it	O
retells	O
the	O
plot	O
of	O
Portal	B-Application
.	O
</s>
<s>
Michael	O
Avon	O
Oeming	O
,	O
who	O
had	O
worked	O
on	O
comics	O
for	O
Valve	O
games	O
Team	B-Application
Fortress	I-Application
2	I-Application
and	O
Left	B-Application
4	I-Application
Dead	I-Application
,	O
and	O
Valve	O
in-house	O
artist	O
Andrea	O
Wicklund	O
drew	O
the	O
comic	O
.	O
</s>
<s>
Ted	O
Kosmatka	O
wrote	O
most	O
of	O
the	O
story	O
with	O
input	O
from	O
the	O
Portal	B-Application
2	I-Application
writers	O
.	O
</s>
<s>
Dark	O
Horse	O
Comics	O
has	O
published	O
"	O
Portal	B-Application
2	I-Application
:	O
Lab	O
Rat	O
"	O
in	O
a	O
printed	O
anthology	O
of	O
Valve	O
comics	O
,	O
Valve	O
Presents	O
:	O
The	O
Sacrifice	O
and	O
Other	O
Steam-Powered	O
Stories	O
,	O
in	O
November	O
2011	O
.	O
</s>
<s>
He	O
escapes	O
GLaDOS	O
's	O
initial	O
neurotoxin	O
attack	O
,	O
but	O
suffers	O
symptoms	O
as	O
his	O
schizophrenia	B-Application
medication	O
runs	O
out	O
,	O
causing	O
hallucinations	O
of	O
his	O
Weighted	O
Companion	O
Cube	O
talking	O
.	O
</s>
<s>
Noticing	O
that	O
Chell	O
is	O
uniquely	O
tenacious	O
among	O
the	O
test	O
subjects	O
held	O
by	O
Aperture	O
,	O
Rattmann	O
moves	O
her	O
to	O
the	O
top	O
of	O
the	O
queue	O
of	O
testing	O
subjects	O
,	O
thus	O
starting	O
the	O
events	O
of	O
the	O
first	O
Portal	B-Application
.	O
</s>
<s>
The	O
Final	O
Hours	O
of	O
Portal	B-Application
2	I-Application
is	O
a	O
digital	O
book	O
written	O
and	O
created	O
by	O
Geoff	O
Keighley	O
.	O
</s>
<s>
This	O
digital	O
book	O
gives	O
insight	O
on	O
the	O
creation	O
of	O
Portal	B-Application
2	I-Application
.	O
</s>
<s>
One	O
piece	O
,	O
"	O
The	O
Final	O
Hours	O
of	O
Half-Life	B-Application
2	I-Application
"	O
,	O
allowed	O
Keighley	O
to	O
interact	O
with	O
Valve	O
during	O
2003	O
and	O
2004	O
and	O
talk	O
with	O
the	O
staff	O
as	O
they	O
completed	O
work	O
on	O
Half-Life	B-Application
2	I-Application
.	O
</s>
<s>
Keighley	O
wanted	O
to	O
recreate	O
a	O
similar	O
work	O
for	O
Portal	B-Application
2	I-Application
,	O
with	O
focus	O
on	O
making	O
it	O
an	O
interactive	O
work	O
for	O
the	O
iPad	B-Device
.	O
</s>
<s>
Keighley	O
was	O
granted	O
"	O
fly	O
on	O
the	O
wall	O
"	O
access	O
to	O
Valve	O
when	O
Portal	B-Application
2	I-Application
was	O
being	O
produced	O
.	O
</s>
<s>
The	O
initial	O
iPad	B-Device
release	O
was	O
written	O
by	O
Keighley	O
with	O
work	O
by	O
Joe	O
Zeff	O
Design	O
,	O
a	O
studio	O
that	O
had	O
also	O
produced	O
digital	O
applications	O
for	O
Time	O
magazine	O
.	O
</s>
<s>
The	O
work	O
was	O
later	O
ported	O
into	O
a	O
non-interactive	O
eBook	O
,	O
and	O
into	O
an	O
application	O
with	O
the	O
same	O
iPad	B-Device
interactivity	O
on	O
the	O
Steam	O
platform	O
.	O
</s>
<s>
With	O
the	O
iPad	B-Device
and	O
Steam	O
version	O
,	O
Keighley	O
is	O
able	O
to	O
offer	O
live	O
updates	O
to	O
the	O
work	O
;	O
upon	O
release	O
of	O
the	O
"	O
Peer	O
Review	O
"	O
downloadable	B-Protocol
content	I-Protocol
pack	O
,	O
the	O
work	O
was	O
updated	O
with	O
an	O
additional	O
chapter	O
discussing	O
the	O
creation	O
of	O
the	O
new	O
content	O
and	O
what	O
new	O
features	O
players	O
could	O
expect	O
in	O
the	O
future	O
from	O
Portal	B-Application
2	I-Application
.	O
</s>
<s>
The	B-Application
Potato	I-Application
Sack	I-Application
was	O
an	O
A.R.G	O
(	O
alternate	O
reality	O
game	O
)	O
conceived	O
by	O
Valve	O
and	O
13	O
indie	O
video	O
game	O
developers	O
as	O
a	O
prelude	O
to	O
the	O
release	O
of	O
Portal	B-Application
2	I-Application
.	O
</s>
<s>
Portal	B-Application
2	I-Application
had	O
been	O
announced	O
by	O
a	O
similar	O
game	O
,	O
where	O
a	O
patch	O
applied	O
to	O
the	O
Steam	O
version	O
of	O
Portal	B-Application
in	O
March	O
2010	O
,	O
provided	O
clues	O
heralding	O
the	O
official	O
announcement	O
.	O
</s>
<s>
The	B-Application
Potato	I-Application
Sack	I-Application
game	O
,	O
launched	O
on	O
April	O
1	O
,	O
2011	O
,	O
led	O
to	O
the	O
reveal	O
of	O
"	O
GLaDOS	O
@home	O
"	O
,	O
a	O
spoof	O
of	O
distributed	O
computer	O
challenges	O
,	O
to	O
get	O
players	O
to	O
cooperate	O
on	O
playing	O
the	O
independent	O
games	O
as	O
to	O
unlock	O
Portal	B-Application
2	I-Application
on	O
Steam	O
about	O
10	O
hours	O
before	O
its	O
planned	O
release	O
.	O
</s>
<s>
A	O
board	O
game	O
version	O
of	O
Portal	B-Application
,	O
developed	O
by	O
Cryptozoic	O
Entertainment	O
with	O
oversight	O
from	O
Valve	O
,	O
was	O
released	O
in	O
2015	O
.	O
</s>
<s>
Titled	O
Portal	B-Application
:	O
Uncooperative	O
Cake	O
Acquisition	O
Game	O
,	O
the	O
game	O
is	O
based	O
on	O
players	O
manipulating	O
their	O
tokens	O
-	O
which	O
are	O
representative	O
of	O
unwitting	O
test	O
subjects	O
-	O
through	O
various	O
test	O
chambers	O
in	O
the	O
Aperture	O
Laboratories	O
.	O
</s>
<s>
Valve	O
has	O
sold	O
several	O
Portal-based	O
prints	O
,	O
T-shirts	O
,	O
and	O
other	O
memorabilia	O
through	O
its	O
own	O
store	O
,	O
often	O
riding	O
on	O
the	O
popularity	O
of	O
certain	O
memes	O
that	O
the	O
series	O
has	O
created	O
.	O
</s>
<s>
WizKids	B-Application
has	O
released	O
collectible	O
miniatures	O
of	O
the	O
turrets	O
,	O
cores	O
and	O
companion	O
cube(s )	O
within	O
the	O
game	O
.	O
</s>
<s>
The	O
series	O
 '	O
main	O
antagonist	O
,	O
GLaDOS	O
,	O
was	O
included	O
as	O
the	O
dealer	O
in	O
Poker	B-Application
Night	I-Application
2	I-Application
.	O
</s>
<s>
This	O
game	O
features	O
Portal	B-Application
themed	O
unlockables	O
such	O
as	O
playing	O
cards	O
,	O
table	O
and	O
room	O
.	O
</s>
<s>
A	O
Portal	B-Application
based	O
downloadable	B-Protocol
content	I-Protocol
for	O
Zen	B-Application
Pinball	I-Application
2	I-Application
Pinball	O
FX2	O
was	O
made	O
in	O
collaboration	O
with	O
Valve	O
and	O
Zen	O
Studios	O
.	O
</s>
<s>
The	O
crossover	O
video	O
game	O
Lego	B-Application
Dimensions	I-Application
,	O
which	O
incorporates	O
the	O
use	O
of	O
Lego	O
minifigures	O
with	O
a	O
special	O
gamepad	O
,	O
includes	O
Portal-themed	O
elements	O
,	O
as	O
demonstrated	O
during	O
its	O
Electronic	O
Entertainment	O
Expo	O
2015	O
trailer	O
.	O
</s>
<s>
A	O
Portal-themed	O
level	O
appears	O
as	O
part	O
of	O
the	O
main	O
story	O
campaign	O
,	O
with	O
GLaDOS	O
playing	O
a	O
significant	O
role	O
in	O
the	O
game	O
's	O
plot	O
.	O
</s>
<s>
The	O
Portal	B-Application
levels	O
include	O
Easter	O
eggs	O
based	O
on	O
Doug	O
Rattman	O
hiding	O
himself	O
away	O
.	O
</s>
<s>
A	O
cosmetic	O
set	O
based	O
on	O
the	O
Companion	O
Cube	O
was	O
released	O
as	O
a	O
visual	O
replacement	O
for	O
the	O
"	O
Io	O
"	O
character	O
in	O
Valve	O
's	O
multiplayer	O
online	O
battle	O
arena	O
game	O
,	O
Dota	B-Application
2	I-Application
.	O
</s>
<s>
GLaDOS	O
guest	O
stars	O
in	O
Defense	B-Application
Grid	I-Application
:	I-Application
The	I-Application
Awakening	I-Application
in	O
a	O
full-story	O
expansion	O
.	O
</s>
<s>
Atlas	O
appears	O
as	O
a	O
player-character	O
in	O
the	O
downloadable	B-Protocol
content	I-Protocol
package	O
for	O
Runner2	B-Application
.	O
</s>
<s>
P-Body	O
is	O
a	O
playable	O
character	O
in	O
the	O
Windows	O
release	O
of	O
Super	B-Application
Bomberman	I-Application
R	I-Application
.	O
In	O
April	O
2018	O
,	O
set	O
of	O
seven	O
Portal-themed	O
DLC	B-Protocol
levels	O
were	O
added	O
to	O
The	B-Application
Ball	I-Application
.	O
</s>
<s>
A	O
few	O
Portal	B-Application
characters	O
,	O
including	O
Chell	O
and	O
P-Body	O
,	O
feature	O
as	O
avatar	O
customization	O
items	O
in	O
the	O
game	O
Fall	B-Application
Guys	I-Application
for	O
5	O
crowns	O
each	O
.	O
</s>
<s>
Portal	B-Application
has	O
appeared	O
in	O
the	O
game	O
What	B-Application
The	I-Application
Golf	I-Application
as	O
a	O
set	O
of	O
levels	O
.	O
</s>
<s>
GLaDOS	O
appears	O
in	O
a	O
sub-quest	O
in	O
Cyberpunk	B-Application
2077	I-Application
as	O
a	O
murderous	O
AI	B-Application
driving	O
a	O
taxi	O
and	O
eventually	O
tries	O
to	O
kill	O
the	O
protagonist	O
.	O
</s>
<s>
Evil	B-Device
Genius	I-Device
2	I-Device
:	I-Device
World	I-Device
Domination	I-Device
includes	O
a	O
free	O
Portal	B-Application
themed	O
expansion	O
pack	O
which	O
adds	O
Portal-themed	O
rooms	O
and	O
traps	O
to	O
the	O
game	O
.	O
</s>
<s>
Rocket	B-Application
League	I-Application
released	O
free	O
DLC	B-Protocol
that	O
includes	O
a	O
variety	O
of	O
items	O
from	O
the	O
Portal	B-Application
series	O
available	O
for	O
vehicle	O
customization	O
.	O
</s>
<s>
Minecraft	B-Application
officially	O
features	O
the	O
Portal	B-Application
characters	O
Chell	O
,	O
Atlas	O
,	O
and	O
P-Body	O
as	O
cosmetic	O
skins	O
purchasable	O
from	O
the	O
Minecraft	B-Application
Marketplace	O
for	O
Minecraft	B-Application
Bedrock	O
Edition	O
.	O
</s>
<s>
The	O
skin	O
pack	O
featuring	O
these	O
characters	O
was	O
originally	O
released	O
as	O
DLC	B-Protocol
for	O
Minecraft	B-Application
Xbox	B-Operating_System
360	I-Operating_System
Edition	O
.	O
</s>
<s>
Portal	B-Application
Stories	O
:	O
Mel	O
is	O
a	O
single-player	O
mod	O
of	O
Portal	B-Application
2	I-Application
developed	O
by	O
Prism	O
Studios	O
.	O
</s>
<s>
Portal	B-Application
Stories	O
:	O
VR	O
is	O
a	O
single-player	O
virtual	B-Application
reality	I-Application
fangame	B-Application
of	O
Portal	B-Application
2	I-Application
developed	O
by	O
Prism	O
Studios	O
.	O
</s>
<s>
Thinking	O
with	O
Time	O
Machine	O
is	O
a	O
single-player	O
mod	O
for	O
Portal	B-Application
2	I-Application
developed	O
by	O
Ruslan	O
Rybka	O
,	O
also	O
known	O
as	O
Stridemann	O
,	O
and	O
released	O
by	O
SignHead	O
Studio	O
.	O
</s>
<s>
Portal	B-Application
Reloaded	O
is	O
a	O
2021	O
single-player	O
mod	O
for	O
Portal	B-Application
2	I-Application
developed	O
by	O
Jannis	O
Brinkmann	O
.	O
</s>
<s>
Mari0	O
is	O
a	O
fan-made	O
video	O
game	O
that	O
combines	O
elements	O
of	O
the	O
video	O
games	O
Super	B-Application
Mario	I-Application
Bros	I-Application
.	I-Application
and	O
Portal	B-Application
.	O
</s>
<s>
In	O
August	O
2011	O
,	O
Dan	O
Trachtenberg	O
released	O
a	O
fan	O
film	O
based	O
on	O
the	O
series	O
called	O
Portal	B-Application
:	O
No	O
Escape	O
.	O
</s>
<s>
Summit	O
,	O
Valve	O
's	O
Newell	O
and	O
film	O
director	O
J	O
.	O
J	O
.	O
Abrams	O
announced	O
plans	O
to	O
partner	O
to	O
create	O
films	O
on	O
Valve	O
's	O
properties	O
,	O
including	O
Half-Life	B-Application
and	O
Portal	B-Application
.	O
</s>
<s>
In	O
an	O
"	O
ask	O
me	O
anything	O
"	O
thread	O
on	O
Reddit	B-Application
in	O
January	O
2017	O
,	O
Newell	O
confirmed	O
that	O
Valve	O
is	O
still	O
working	O
on	O
this	O
film	O
.	O
</s>
<s>
The	O
Portal	B-Application
games	I-Application
have	O
found	O
application	O
in	O
educational	O
aspects	O
outside	O
of	O
game	O
development	O
.	O
</s>
<s>
At	O
least	O
one	O
college	O
,	O
Wabash	O
College	O
,	O
introduced	O
Portal	B-Application
as	O
part	O
of	O
required	O
coursework	O
;	O
at	O
Wabash	O
,	O
the	O
game	O
is	O
used	O
as	O
an	O
example	O
of	O
Erving	O
Goffman	O
's	O
dissemination	O
on	O
dramaturgy	O
,	O
The	O
Presentation	O
of	O
Self	O
in	O
Everyday	O
Life	O
.	O
</s>
<s>
At	O
a	O
mid-2011	O
presentation	O
at	O
the	O
2011	O
Games	B-Application
for	I-Application
Change	I-Application
Festival	O
at	O
New	O
York	O
University	O
,	O
Gabe	O
Newell	O
stated	O
Valve	O
's	O
intention	O
to	O
direct	O
Portal	B-Application
and	O
Portal	B-Application
2	I-Application
towards	O
education	O
.	O
</s>
<s>
As	O
part	O
of	O
this	O
effect	O
,	O
the	O
company	O
promoted	O
Portal	B-Application
for	O
free	O
use	O
by	O
any	O
user	O
during	O
September	O
2011	O
.	O
</s>
<s>
In	O
speaking	O
at	O
the	O
2012	O
Games	B-Application
for	I-Application
Change	I-Application
Festival	O
,	O
Newell	O
said	O
that	O
the	O
response	O
to	O
these	O
efforts	O
was	O
praised	O
by	O
educators	O
.	O
</s>
<s>
Their	O
efforts	O
culminated	O
in	O
a	O
"	O
Teach	O
with	O
Portals	B-Application
"	O
program	O
that	O
Newell	O
announced	O
at	O
the	O
Festival	O
.	O
</s>
<s>
The	O
effort	O
is	O
built	O
on	O
a	O
standalone	O
"	O
Puzzle	O
Maker	O
"	O
that	O
incorporates	O
the	O
level	O
editor	O
for	O
Portal	B-Application
2	I-Application
that	O
was	O
released	O
as	O
free	O
content	O
for	O
the	O
game	O
in	O
early	O
2012	O
.	O
</s>
<s>
The	O
"	O
Teach	O
with	O
Portals	B-Application
"	O
initiative	O
is	O
built	O
atop	O
of	O
a	O
stripped-down	O
version	O
of	O
the	O
Steam	O
client	O
,	O
"	O
Steam	O
for	O
Schools	O
"	O
,	O
that	O
is	O
designed	O
to	O
be	O
used	O
in	O
schools	O
,	O
allowing	O
instructors	O
to	O
control	O
the	O
installation	O
of	O
the	O
games	O
and	O
lesson	O
plans	O
on	O
the	O
students	O
 '	O
computers	O
.	O
</s>
<s>
These	O
tools	O
,	O
as	O
well	O
as	O
copies	O
of	O
Portal	B-Application
2	I-Application
and	O
the	O
Puzzle	O
Maker	O
,	O
are	O
being	O
offered	O
for	O
free	O
for	O
all	O
educators	O
.	O
</s>
<s>
In	O
February	O
2013	O
,	O
Valve	O
president	O
Gabe	O
Newell	O
and	O
film	O
director	O
J	O
.	O
J	O
.	O
Abrams	O
announced	O
that	O
they	O
were	O
to	O
collaborate	O
on	O
a	O
film	O
adaptation	O
of	O
the	O
Portal	B-Application
series	O
.	O
</s>
<s>
Several	O
elements	O
of	O
the	O
Portal	B-Application
series	O
have	O
entered	O
popular	O
culture	O
,	O
typically	O
as	O
bases	O
for	O
Internet	O
memes	O
.	O
</s>
<s>
During	O
Portal	B-Application
,	O
the	O
player	O
explores	O
areas	O
outside	O
of	O
the	O
test	O
chambers	O
where	O
scrawled	O
messages	O
left	O
by	O
Rattmann	O
and	O
others	O
warn	O
of	O
GLaDOS	O
 '	O
deception	O
.	O
</s>
<s>
In	O
particular	O
,	O
while	O
GLaDOS	O
promises	O
that	O
Chell	O
will	O
receive	O
cake	O
for	O
completing	O
the	O
training	O
courses	O
,	O
the	O
messages	O
alert	O
that	O
this	O
reward	O
does	O
not	O
exist	O
,	O
and	O
that	O
"	O
the	B-Application
cake	I-Application
is	I-Application
a	I-Application
lie	I-Application
"	O
.	O
</s>
<s>
When	O
writing	O
Portal	B-Application
2	I-Application
,	O
Wolpaw	O
stated	O
that	O
they	O
were	O
so	O
sick	O
of	O
cake	O
jokes	O
that	O
they	O
purposely	O
avoided	O
any	O
reference	O
to	O
that	O
,	O
save	O
for	O
one	O
subtle	O
nod	O
.	O
</s>
<s>
In	O
one	O
Portal	B-Application
level	O
,	O
the	O
player	O
is	O
given	O
an	O
inanimate	O
weighted	O
cube	O
with	O
hearts	O
on	O
all	O
sides	O
,	O
called	O
the	O
"	O
Weighted	O
Companion	O
Cube	O
"	O
by	O
GLaDOS	O
.	O
</s>
<s>
The	O
Weighted	O
Companion	O
Cube	O
became	O
a	O
popular	O
item	O
to	O
include	O
on	O
Portal-themed	O
merchandise	O
.	O
</s>
<s>
Portal	B-Application
credit	O
sequence	O
plays	O
over	O
the	O
song	O
"	O
Still	O
Alive	O
"	O
,	O
composed	O
by	O
Jonathan	O
Coulton	O
,	O
and	O
,	O
in	O
its	O
original	O
form	O
,	O
sung	O
by	O
Ellen	O
McLain	O
in	O
the	O
GLaDOS	O
voice	O
.	O
</s>
<s>
The	O
song	O
,	O
sung	O
from	O
GLaDOS	O
's	O
point	O
of	O
view	O
as	O
considering	O
her	O
defeat	O
as	O
"	O
a	O
success	O
"	O
,	O
contributed	O
to	O
the	O
positive	O
response	O
of	O
the	O
game	O
as	O
well	O
as	O
highlight	O
Coulton	O
's	O
work	O
to	O
players	O
,	O
and	O
leading	O
to	O
Valve	O
bringing	O
back	O
Coulton	O
to	O
record	O
a	O
credits	O
song	O
for	O
Portal	B-Application
2	I-Application
.	O
</s>
<s>
The	O
portal	B-Application
gun	O
is	O
one	O
of	O
several	O
weapons	O
used	O
alongside	O
ones	O
from	O
other	O
game	O
and	O
film	O
franchises	O
within	O
in	O
a	O
climactic	O
fight	O
for	O
the	O
2021	O
film	O
Free	O
Guy	O
which	O
takes	O
place	O
within	O
a	O
video	O
game	O
.	O
</s>
<s>
In	O
2022	O
,	O
GEICO	O
released	O
a	O
commercial	O
entitled	O
"	O
The	O
Gecko	O
Visits	O
Portal	B-Application
"	O
,	O
featuring	O
elements	O
from	O
the	O
Portal	B-Application
games	I-Application
such	O
as	O
an	O
unreleased	O
test	O
chamber	O
shown	O
in	O
trailers	O
for	O
Portal	B-Application
2	I-Application
,	O
with	O
McLain	O
reprising	O
her	O
role	O
as	O
GLaDOS	O
.	O
</s>
