<s>
Half-Life	B-Application
:	I-Application
Alyx	I-Application
is	O
a	O
2020	O
virtual	B-Application
reality	I-Application
(	O
VR	O
)	O
first-person	O
shooter	O
game	O
developed	O
and	O
published	O
by	O
Valve	O
.	O
</s>
<s>
It	O
was	O
released	O
for	O
Windows	B-Application
and	O
Linux	B-Application
with	O
support	O
for	O
most	O
PC-compatible	O
VR	B-Device
headsets	I-Device
.	O
</s>
<s>
Set	O
five	O
years	O
before	O
Half-Life	B-Application
2	I-Application
(	O
2004	O
)	O
,	O
players	O
control	O
Alyx	O
Vance	O
on	O
a	O
mission	O
to	O
seize	O
a	O
superweapon	O
belonging	O
to	O
the	O
alien	O
Combine	O
.	O
</s>
<s>
Like	O
previous	O
Half-Life	B-Application
games	O
,	O
Alyx	O
incorporates	O
combat	O
,	O
puzzles	O
,	O
exploration	O
and	O
survival	O
horror	O
.	O
</s>
<s>
Players	O
use	O
VR	O
to	O
interact	O
with	O
the	O
environment	O
and	O
fight	O
enemies	O
,	O
using	O
"	O
gravity	O
gloves	O
"	O
to	O
snatch	O
objects	O
from	O
a	O
distance	O
,	O
similarly	O
to	O
the	O
gravity	O
gun	O
from	O
Half-Life	B-Application
2	I-Application
.	O
</s>
<s>
The	O
previous	O
Half-Life	B-Application
game	O
,	O
Episode	B-Application
Two	I-Application
,	O
was	O
released	O
in	O
2007	O
and	O
ended	O
on	O
a	O
cliffhanger	B-Application
.	O
</s>
<s>
Valve	O
made	O
several	O
attempts	O
to	O
develop	O
further	O
Half-Life	B-Application
games	O
,	O
but	O
could	O
not	O
settle	O
on	O
a	O
direction	O
.	O
</s>
<s>
Recognizing	O
the	O
demand	O
for	O
a	O
major	O
VR	B-Application
game	I-Application
,	O
they	O
experimented	O
with	O
prototypes	O
using	O
their	O
various	O
intellectual	O
properties	O
such	O
as	O
Portal	B-Application
,	O
and	O
found	O
Half-Life	B-Application
to	O
be	O
best	O
suited	O
for	O
VR	O
.	O
</s>
<s>
Half-Life	B-Application
:	I-Application
Alyx	I-Application
entered	O
production	O
using	O
Valve	O
's	O
new	O
Source	B-Operating_System
2	I-Operating_System
engine	O
in	O
2016	O
,	O
with	O
the	O
largest	O
team	O
in	O
Valve	O
's	O
history	O
,	O
including	O
members	O
of	O
Campo	O
Santo	O
,	O
a	O
studio	O
Valve	O
acquired	O
in	O
2018	O
.	O
</s>
<s>
Valve	O
initially	O
planned	O
to	O
launch	O
Alyx	O
alongside	O
its	O
Index	B-Device
VR	B-Device
headset	I-Device
in	O
2019	O
,	O
but	O
delayed	O
it	O
following	O
internal	O
feedback	O
about	O
the	O
story	O
by	O
their	O
new	O
writer	O
,	O
Rob	O
Yescombe	O
;	O
Erik	O
Wolpaw	O
and	O
Jay	O
Pinkerton	O
rejoined	O
Valve	O
to	O
rewrite	O
it	O
.	O
</s>
<s>
Half-Life	B-Application
:	I-Application
Alyx	I-Application
received	O
acclaim	O
for	O
its	O
graphics	O
,	O
voice	O
acting	O
,	O
narrative	O
,	O
and	O
atmosphere	O
,	O
and	O
has	O
been	O
cited	O
as	O
VR	O
's	O
first	O
killer	O
app	O
.	O
</s>
<s>
Valve	O
acknowledged	O
that	O
the	O
audience	O
for	O
VR	B-Application
games	I-Application
was	O
limited	O
;	O
Gabe	O
Newell	O
,	O
the	O
president	O
of	O
Valve	O
,	O
described	O
Alyx	O
as	O
a	O
long-term	O
investment	O
into	O
new	O
technologies	O
.	O
</s>
<s>
Half-Life	B-Application
:	I-Application
Alyx	I-Application
is	O
a	O
virtual	B-Application
reality	I-Application
game	I-Application
(	O
VR	O
)	O
that	O
supports	O
all	O
SteamVR-compatible	O
VR	B-Device
headsets	I-Device
,	O
which	O
include	O
the	O
Valve	B-Device
Index	I-Device
,	O
HTC	B-Application
Vive	O
,	O
Oculus	B-Device
Rift	I-Device
,	O
Oculus	O
Quest	O
and	O
all	O
Windows	B-General_Concept
Mixed	I-General_Concept
Reality	I-General_Concept
headsets	O
.	O
</s>
<s>
Half-Life	B-Application
:	I-Application
Alyx	I-Application
also	O
supports	O
user	O
mods	O
via	O
the	O
Steam	O
Workshop	O
.	O
</s>
<s>
Players	O
control	O
the	B-Application
Resistance	I-Application
member	O
Alyx	O
Vance	O
as	O
she	O
and	O
her	O
father	O
Eli	O
Vance	O
fight	O
the	O
Combine	O
,	O
an	O
alien	O
empire	O
that	O
has	O
conquered	O
Earth	O
.	O
</s>
<s>
The	O
designer	O
David	O
Speyrer	O
said	O
Alyx	O
was	O
not	O
an	O
episodic	O
game	O
or	O
side	O
story	O
,	O
but	O
"	O
the	O
next	O
part	O
of	O
the	O
Half-Life	B-Application
story	O
"	O
,	O
around	O
the	O
same	O
length	O
as	O
Half-Life	B-Application
2	I-Application
.	O
</s>
<s>
Like	O
the	O
gravity	O
gun	O
from	O
Half-Life	B-Application
2	I-Application
,	O
the	O
gravity	O
gloves	O
allow	O
players	O
to	O
pick	O
up	O
objects	O
from	O
a	O
distance	O
.	O
</s>
<s>
The	O
game	O
includes	O
traditional	O
Half-Life	B-Application
elements	O
such	O
as	O
exploration	O
,	O
puzzles	O
,	O
combat	O
,	O
and	O
story	O
.	O
</s>
<s>
Players	O
can	O
physically	O
move	O
around	O
in	O
room	B-General_Concept
scale	I-General_Concept
to	O
move	O
Alyx	O
in-game	O
.	O
</s>
<s>
Alternatively	O
,	O
they	O
can	O
use	O
analog	B-Device
sticks	I-Device
on	O
the	O
VR	O
controllers	O
to	O
move	O
Alyx	O
as	O
in	O
a	O
traditional	O
game	O
,	O
teleport	O
to	O
nearby	O
points	O
,	O
or	O
use	O
an	O
intermediate	O
mode	O
to	O
"	O
glide	O
"	O
to	O
selected	O
points	O
.	O
</s>
<s>
Half-Life	B-Application
:	I-Application
Alyx	I-Application
takes	O
place	O
five	O
years	O
before	O
the	O
events	O
of	O
Half-Life	B-Application
2	I-Application
.	O
</s>
<s>
As	O
she	O
approaches	O
the	O
vault	O
,	O
Alyx	O
overhears	O
a	O
scientist	O
mentioning	O
to	O
Combine	O
superiors	O
that	O
the	O
occupant	O
is	O
a	O
survivor	O
of	O
the	O
Black	B-Application
Mesa	I-Application
incident	I-Application
.	O
</s>
<s>
He	O
instead	O
transfers	O
her	O
to	O
the	O
future	O
,	O
and	O
offers	O
her	O
the	O
chance	O
to	O
change	O
the	O
outcome	O
of	O
Eli	O
's	O
death	O
at	O
the	O
hands	O
of	O
a	O
Combine	O
Advisor	O
at	O
the	O
end	O
of	O
Half-Life	B-Application
2	I-Application
:	I-Application
Episode	I-Application
Two	I-Application
.	O
</s>
<s>
After	O
the	O
release	O
of	O
Half-Life	B-Application
2	I-Application
in	O
2004	O
,	O
Valve	O
began	O
developing	O
a	O
trilogy	O
of	O
episodic	O
sequels	O
,	O
planning	O
to	O
release	O
shorter	O
games	O
more	O
frequently	O
.	O
</s>
<s>
Half-Life	B-Application
2	I-Application
:	I-Application
Episode	I-Application
One	I-Application
was	O
released	O
in	O
2006	O
,	O
followed	O
by	O
Episode	B-Application
Two	I-Application
in	O
2007	O
,	O
which	O
ended	O
on	O
a	O
cliffhanger	B-Application
.	O
</s>
<s>
Episode	B-Application
Three	I-Application
was	O
scheduled	O
for	O
2008	O
,	O
but	O
was	O
canceled	O
.	O
</s>
<s>
The	O
designer	O
Robin	O
Walker	O
said	O
that	O
Valve	O
used	O
the	O
Half-Life	B-Application
series	O
to	O
"	O
solve	O
some	O
interesting	O
collision	O
of	O
technology	O
and	O
art	O
that	O
had	O
reared	O
itself	O
"	O
;	O
when	O
working	O
on	O
Episode	B-Application
Three	I-Application
,	O
Valve	O
failed	O
to	O
find	O
a	O
unifying	O
idea	O
that	O
provided	O
a	O
sense	O
of	O
"	O
wonderment	O
,	O
or	O
opening	O
,	O
or	O
expansion	O
"	O
.	O
</s>
<s>
Valve	O
abandoned	O
episodic	O
development	O
and	O
made	O
several	O
failed	O
attempts	O
to	O
develop	O
further	O
Half-Life	B-Application
projects	O
.	O
</s>
<s>
Valve	O
decided	O
to	O
complete	O
its	O
new	O
engine	O
,	O
Source	B-Operating_System
2	I-Operating_System
,	O
before	O
beginning	O
a	O
new	O
game	O
,	O
as	O
developing	O
Half-Life	B-Application
2	I-Application
and	O
the	O
original	O
Source	B-Application
engine	I-Application
simultaneously	O
had	O
created	O
problems	O
.	O
</s>
<s>
In	O
2016	O
and	O
2017	O
,	O
the	O
Half-Life	B-Application
writers	O
Marc	O
Laidlaw	O
,	O
Erik	O
Wolpaw	O
,	O
Jay	O
Pinkerton	O
and	O
Chet	O
Faliszek	O
left	O
Valve	O
;	O
coupled	O
with	O
Valve	O
's	O
support	O
for	O
their	O
other	O
franchises	O
,	O
journalists	O
took	O
the	O
departures	O
as	O
an	O
indicator	O
that	O
new	O
Half-Life	B-Application
games	O
were	O
no	O
longer	O
in	O
development	O
.	O
</s>
<s>
In	O
2015	O
,	O
Valve	O
collaborated	O
with	O
the	O
electronics	O
company	O
HTC	B-Application
to	O
develop	O
the	O
HTC	B-Application
Vive	O
,	O
a	O
virtual	B-Device
reality	I-Device
headset	I-Device
released	O
in	O
2016	O
.	O
</s>
<s>
Valve	O
's	O
president	O
,	O
Gabe	O
Newell	O
,	O
aimed	O
for	O
Valve	O
to	O
become	O
more	O
like	O
Nintendo	O
,	O
which	O
develops	O
games	O
in	O
tandem	O
with	O
hardware	O
and	O
allows	O
them	O
to	O
create	O
innovative	O
games	O
such	O
as	O
Super	B-Application
Mario	I-Application
64	I-Application
.	O
</s>
<s>
Valve	O
experimented	O
with	O
VR	O
,	O
and	O
in	O
2016	O
released	O
The	B-Application
Lab	I-Application
,	O
a	O
collection	O
of	O
VR	O
minigames	O
.	O
</s>
<s>
Walker	O
wondered	O
if	O
they	O
could	O
develop	O
a	O
VR	O
"	O
killer	O
app	O
"	O
,	O
as	O
the	O
influential	O
FPS	O
Doom	B-Application
had	O
been	O
in	O
1993	O
.	O
</s>
<s>
Finding	O
that	O
the	O
portal	B-Application
systems	O
of	O
their	O
puzzle	O
series	O
Portal	B-Application
were	O
disorienting	O
in	O
VR	O
,	O
they	O
settled	O
on	O
Half-Life	B-Application
.	O
</s>
<s>
Walker	O
said	O
that	O
Half-Life	B-Application
3	O
had	O
been	O
a	O
"	O
terrifyingly	O
daunting	O
prospect	O
"	O
,	O
and	O
the	O
team	O
saw	O
VR	O
as	O
a	O
way	O
to	O
return	O
to	O
the	O
series	O
.	O
</s>
<s>
Additionally	O
,	O
Valve	O
anticipated	O
that	O
fans	O
would	O
react	O
negatively	O
if	O
Half-Life	B-Application
3	O
were	O
a	O
VR-only	O
game	O
,	O
and	O
felt	O
that	O
a	O
prequel	O
carried	O
less	O
weight	O
.	O
</s>
<s>
Valve	O
built	O
prototypes	O
using	O
Half-Life	B-Application
2	I-Application
assets	O
,	O
and	O
narrowed	O
the	O
gameplay	O
systems	O
to	O
those	O
they	O
felt	O
best	O
fit	O
VR	O
.	O
</s>
<s>
They	O
found	O
that	O
the	O
Half-Life	B-Application
systems	O
were	O
a	O
"	O
surprisingly	O
natural	O
fit	O
"	O
for	O
VR	O
,	O
but	O
that	O
VR	O
affected	O
almost	O
every	O
aspect	O
of	O
the	O
design	O
,	O
including	O
combat	O
,	O
level	O
design	O
and	O
pacing	O
.	O
</s>
<s>
Half-Life	B-Application
:	I-Application
Alyx	I-Application
entered	O
development	O
around	O
February	O
2016	O
,	O
and	O
entered	O
full	O
production	O
later	O
that	O
year	O
.	O
</s>
<s>
In	O
late	O
2018	O
,	O
Valve	O
held	O
a	O
company-wide	O
playtest	B-General_Concept
of	O
the	O
entire	O
game	O
;	O
the	O
results	O
convinced	O
the	O
team	O
that	O
VR	O
had	O
been	O
the	O
right	O
choice	O
.	O
</s>
<s>
Mike	O
Morasky	O
,	O
the	O
composer	O
for	O
Portal	B-Application
2	I-Application
and	O
Team	B-Application
Fortress	I-Application
2	I-Application
,	O
wrote	O
the	O
score	O
in	O
consultation	O
with	O
Kelly	O
Bailey	O
,	O
the	O
composer	O
for	O
previous	O
Half-Life	B-Application
games	O
.	O
</s>
<s>
To	O
mitigate	O
the	O
problem	O
of	O
motion	B-Application
sickness	I-Application
in	I-Application
VR	I-Application
,	O
Valve	O
implemented	O
several	O
movement	O
options	O
.	O
</s>
<s>
They	O
cited	O
inspiration	O
from	O
the	O
2018	O
VR	B-Application
game	I-Application
Budget	B-Application
Cuts	I-Application
,	O
which	O
uses	O
teleporting	O
to	O
move	O
the	O
player	O
between	O
locations	O
.	O
</s>
<s>
The	O
crowbar	O
,	O
an	O
iconic	O
weapon	O
from	O
previous	O
Half-Life	B-Application
games	O
,	O
was	O
omitted	O
as	O
Valve	O
could	O
not	O
make	O
melee	O
combat	O
work	O
in	O
VR	O
,	O
and	O
because	O
players	O
would	O
accidentally	O
catch	O
it	O
on	O
objects	O
in	O
the	O
game	O
world	O
as	O
they	O
moved	O
,	O
creating	O
confusion	O
.	O
</s>
<s>
Antlions	O
,	O
returning	O
enemies	O
from	O
Half-Life	B-Application
2	I-Application
,	O
would	O
quickly	O
overwhelm	O
players	O
;	O
the	O
team	O
slowed	O
their	O
movement	O
and	O
added	O
the	O
ability	O
to	O
shoot	O
their	O
legs	O
off	O
to	O
slow	O
them	O
down	O
.	O
</s>
<s>
Fast	O
zombies	O
and	O
fast	O
headcrabs	O
,	O
also	O
introduced	O
in	O
Half-Life	B-Application
2	I-Application
,	O
were	O
cut	O
as	O
they	O
were	O
too	O
frightening	O
for	O
some	O
players	O
in	O
VR	O
.	O
</s>
<s>
Merle	O
Dandridge	O
reprised	O
her	O
role	O
as	O
Alyx	O
for	O
initial	O
recording	O
sessions	O
in	O
March	O
2019	O
,	O
but	O
after	O
playtests	B-General_Concept
indicated	O
that	O
Alyx	O
needed	O
a	O
younger	O
voice	O
,	O
Ozioma	O
Akagha	O
was	O
cast	O
in	O
September	O
2019	O
.	O
</s>
<s>
Cissy	O
Jones	O
(	O
Olga	O
)	O
and	O
Rich	O
Sommer	O
(	O
Larry	O
,	O
Russell	O
's	O
Drone	O
,	O
and	O
Combine	O
Soldiers	O
)	O
were	O
cast	O
at	O
the	O
suggestion	O
of	O
writer	O
Sean	O
Vanaman	O
,	O
who	O
had	O
worked	O
with	O
them	O
on	O
Campo	O
Santo	O
's	O
Firewatch	B-Application
(	O
2016	O
)	O
.	O
</s>
<s>
Yescombe	O
's	O
narrative	O
was	O
darker	O
than	O
other	O
Half-Life	B-Application
games	O
,	O
with	O
scenes	O
of	O
dread	O
,	O
torture	O
and	O
horror	O
.	O
</s>
<s>
Yescombe	O
also	O
proposed	O
an	O
ending	O
in	O
which	O
Alyx	O
and	O
the	O
G-Man	O
would	O
travel	O
back	O
in	O
time	O
to	O
the	O
events	O
of	O
the	O
first	O
Half-Life	B-Application
to	O
prevent	O
Freeman	O
from	O
triggering	O
the	O
alien	O
invasion	O
.	O
</s>
<s>
After	O
the	O
company-wide	O
playtest	B-General_Concept
in	O
2018	O
,	O
feedback	O
was	O
overwhelmingly	O
positive	O
but	O
for	O
the	O
story	O
,	O
which	O
employees	O
scored	O
the	O
lowest	O
of	O
any	O
Valve	O
game	O
.	O
</s>
<s>
Valve	O
initially	O
planned	O
to	O
launch	O
Alyx	O
alongside	O
its	O
Index	B-Device
VR	B-Device
headset	I-Device
in	O
June	O
2019	O
,	O
but	O
delayed	O
it	O
to	O
address	O
the	O
story	O
.	O
</s>
<s>
Second	O
,	O
the	O
story	O
did	O
not	O
have	O
an	O
impact	O
on	O
the	O
overall	O
Half-Life	B-Application
story	O
;	O
the	O
writers	O
did	O
not	O
want	O
it	O
to	O
feel	O
"	O
just	O
like	O
a	O
hermetically	O
sealed	O
short	O
story	O
in	O
the	O
world	O
of	O
Half-Life	B-Application
"	O
.	O
</s>
<s>
Walker	O
said	O
the	O
team	O
did	O
not	O
want	O
the	O
ending	O
to	O
be	O
something	O
"	O
you	O
could	O
just	O
ignore	O
"	O
,	O
and	O
knew	O
that	O
fans	O
had	O
been	O
in	O
a	O
"	O
narrative	O
limbo	O
"	O
since	O
Episode	B-Application
Two	I-Application
,	O
which	O
they	O
wanted	O
to	O
change	O
.	O
</s>
<s>
Having	O
Alyx	O
and	O
the	O
G-Man	O
travel	O
forward	O
in	O
time	O
and	O
rescue	O
Eli	O
at	O
the	O
end	O
of	O
Episode	B-Application
Two	I-Application
was	O
suggested	O
by	O
the	O
character	O
artist	O
Jim	O
Murray	O
.	O
</s>
<s>
The	O
team	O
was	O
reluctant	O
,	O
as	O
this	O
undid	O
the	O
Episode	B-Application
Two	I-Application
cliffhanger	B-Application
,	O
but	O
were	O
intrigued	O
by	O
the	O
questions	O
it	O
raised	O
about	O
the	O
world	O
and	O
how	O
it	O
pushed	O
the	O
Half-Life	B-Application
story	O
forward	O
.	O
</s>
<s>
The	O
change	O
required	O
Valve	O
to	O
create	O
new	O
assets	O
,	O
such	O
as	O
the	O
Episode	B-Application
Two	I-Application
White	O
Forest	O
helicopter	O
hangar	O
and	O
models	O
for	O
Dog	O
,	O
an	O
older	O
Eli	O
,	O
and	O
Gordon	O
Freeman	O
.	O
</s>
<s>
The	O
final	O
script	O
ran	O
to	O
280	O
pages	O
,	O
compared	O
to	O
128	O
pages	O
for	O
Half-Life	B-Application
2	I-Application
and	O
18	O
for	O
Half-Life	B-Application
.	O
</s>
<s>
Valve	O
announced	O
Half-Life	B-Application
:	I-Application
Alyx	I-Application
in	O
November	O
2019	O
.	O
</s>
<s>
They	O
were	O
conscious	O
that	O
players	O
,	O
having	O
waited	O
years	O
for	O
a	O
new	O
Half-Life	B-Application
game	O
,	O
might	O
be	O
disappointed	O
by	O
a	O
VR	B-Application
game	I-Application
,	O
and	O
tightly	O
managed	O
the	O
announcement	O
.	O
</s>
<s>
To	O
promote	O
Alyx	O
,	O
Valve	O
made	O
the	O
prior	O
Half-Life	B-Application
games	O
free	O
on	O
Steam	O
from	O
January	O
2020	O
until	O
its	O
release	O
.	O
</s>
<s>
Alyx	O
was	O
free	O
to	O
owners	O
of	O
Valve	B-Device
Index	I-Device
headsets	O
or	O
controllers	O
.	O
</s>
<s>
Valve	O
released	O
a	O
Linux	B-Application
version	O
on	O
May	O
15	O
,	O
2020	O
,	O
along	O
with	O
Vulkan	B-Application
rendering	O
support	O
for	O
both	O
platforms	O
.	O
</s>
<s>
When	O
asked	O
about	O
plans	O
for	O
future	O
Half-Life	B-Application
games	O
,	O
the	O
designer	O
David	O
Speyrer	O
said	O
Valve	O
was	O
willing	O
but	O
were	O
waiting	O
for	O
the	O
reaction	O
to	O
Alyx	O
.	O
</s>
<s>
According	O
to	O
Walker	O
,	O
"	O
We	O
absolutely	O
see	O
Half-Life	B-Application
:	I-Application
Alyx	I-Application
as	O
our	O
return	O
to	O
this	O
world	O
,	O
not	O
the	O
end	O
of	O
it.	O
"	O
</s>
<s>
Mod	O
support	O
tools	O
for	O
the	O
Source	B-Operating_System
2	I-Operating_System
engine	O
and	O
Steam	O
Workshop	O
support	O
for	O
Half-Life	B-Application
:	I-Application
Alyx	I-Application
were	O
released	O
on	O
May	O
15	O
,	O
2020	O
.	O
</s>
<s>
Valve	O
announced	O
plans	O
to	O
release	O
a	O
new	O
Hammer	O
level	O
editor	O
for	O
Source	B-Operating_System
2	I-Operating_System
.	O
</s>
<s>
They	O
planned	O
to	O
release	O
a	O
partial	O
Source	B-Operating_System
2	I-Operating_System
software	B-Application
development	I-Application
kit	I-Application
for	O
the	O
updated	O
features	O
at	O
a	O
later	O
date	O
,	O
with	O
the	O
focus	O
at	O
launch	O
on	O
shipping	O
and	O
supporting	O
Alyx	O
.	O
</s>
<s>
Half-Life	B-Application
:	I-Application
Alyx	I-Application
received	O
"	O
universal	O
acclaim	O
"	O
,	O
according	O
to	O
review	B-Application
aggregator	I-Application
Metacritic	O
.	O
</s>
<s>
Before	O
the	O
game	O
's	O
release	O
,	O
Vic	O
Hood	O
of	O
TechRadar	O
expressed	O
enthusiasm	O
for	O
Alyx	O
,	O
but	O
wrote	O
that	O
"	O
we	O
forever	O
live	O
in	O
hope	O
for	O
a	O
Half-Life	B-Application
3	O
"	O
.	O
</s>
<s>
The	O
Valve	B-Device
Index	I-Device
headset	O
,	O
controllers	O
,	O
and	O
base	O
stations	O
all	O
sold	O
out	O
in	O
the	O
United	O
States	O
,	O
Canada	O
,	O
and	O
Europe	O
within	O
a	O
week	O
of	O
the	O
game	O
's	O
announcement	O
.	O
</s>
<s>
According	O
to	O
Superdata	O
,	O
Valve	O
sold	O
103,000	O
Index	B-Device
units	O
in	O
the	O
fourth	O
quarter	O
of	O
2019	O
as	O
a	O
result	O
of	O
the	O
Alyx	O
announcements	O
,	O
compared	O
to	O
the	O
total	O
149,000	O
sold	O
throughout	O
2019	O
,	O
and	O
it	O
was	O
the	O
highest-selling	O
VR	B-Device
headset	I-Device
for	O
PCs	O
during	O
that	O
quarter	O
.	O
</s>
<s>
Though	O
Valve	O
had	O
expected	O
to	O
supply	O
several	O
Index	B-Device
pre-orders	O
in	O
time	O
for	O
the	O
release	O
of	O
Alyx	O
,	O
the	O
COVID-19	O
pandemic	O
limited	O
their	O
supply	O
chain	O
.	O
</s>
<s>
Half-Life	B-Application
:	I-Application
Alyx	I-Application
won	O
"	O
Game	O
of	O
the	O
Year	O
"	O
at	O
the	O
2020	O
VR	O
Awards	O
.	O
</s>
