<s>
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
is	O
an	O
endless	B-Application
running	I-Application
video	O
game	O
released	O
by	O
Spritonin	O
Media	O
Games	O
on	O
February	O
4	O
,	O
2010	O
.	O
</s>
<s>
Following	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
,	O
Adult	O
Swim	O
released	O
three	O
follow-ups	O
,	O
titled	O
Heavy	O
Metal	O
,	O
Christmas	O
Edition	O
,	O
and	O
Evolution	O
.	O
</s>
<s>
As	O
part	O
of	O
the	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
series	O
,	O
a	O
sequel	O
was	O
developed	O
and	O
released	O
by	O
PikPok	O
for	O
iOS	B-Application
and	O
Android	B-Application
on	O
April	O
25	O
,	O
2013	O
,	O
and	O
July	O
12	O
,	O
2013	O
,	O
respectively	O
.	O
</s>
<s>
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
Forever	O
for	O
iOS	B-Application
,	O
a	O
third	O
game	O
rendered	O
in	O
full	O
3D	O
,	O
was	O
released	O
on	O
April	O
27	O
,	O
2017	O
.	O
</s>
<s>
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
is	O
a	O
side	O
scrolling	O
platform	O
game	O
in	O
which	O
the	O
user	O
controls	O
the	O
movement	O
of	O
a	O
robotic	O
unicorn	B-Application
.	O
</s>
<s>
Points	O
are	O
earned	O
during	O
playtime	O
,	O
by	O
collecting	O
pixies	B-Application
,	O
and	O
by	O
destroying	O
crystal	O
stars	O
by	O
dashing	O
through	O
them	O
.	O
</s>
<s>
Jumps	O
and	O
dashes	O
can	O
be	O
chained	O
together	O
while	O
the	O
unicorn	B-Application
is	O
airborne	O
.	O
</s>
<s>
In	O
October	O
2010	O
,	O
Adult	B-Application
Swim	I-Application
Games	I-Application
released	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
:	O
Heavy	O
Metal	O
,	O
an	O
alternate	O
version	O
of	O
the	O
game	O
featuring	O
different	O
visuals	O
and	O
music	O
,	O
for	O
iPhone	B-Device
.	O
</s>
<s>
In	O
January	O
2011	O
,	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
:	O
Heavy	O
Metal	O
was	O
made	O
available	O
on	O
Facebook	B-Application
alongside	O
its	O
original	O
counterpart	O
as	O
a	O
single	O
application	O
.	O
</s>
<s>
On	O
November	O
23	O
,	O
2010	O
,	O
Adult	O
Swim	O
released	O
a	O
Christmas-themed	O
version	O
of	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
entitled	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
:	O
Christmas	O
Edition	O
.	O
</s>
<s>
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
:	O
Christmas	O
Edition	O
was	O
released	O
on	O
Adultswim.com	O
in	O
November	O
2011	O
.	O
</s>
<s>
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
:	O
Evolution	O
plays	O
identically	O
to	O
the	O
original	O
,	O
but	O
after	O
three	O
stars	O
are	O
broken	O
in	O
a	O
row	O
(	O
four	O
in	O
a	O
row	O
in	O
the	B-Application
Facebook	I-Application
version	O
)	O
,	O
the	O
Robot	B-Application
Unicorn	I-Application
evolves	O
into	O
other	O
robotic	O
creatures	O
.	O
</s>
<s>
In	O
the	B-Application
Facebook	I-Application
version	O
,	O
the	O
player	O
must	O
keep	O
breaking	O
stars	O
in	O
order	O
to	O
transform	O
into	O
the	O
next	O
animal	O
;	O
missing	O
a	O
star	O
will	O
cause	O
the	O
animal	O
to	O
revert	O
to	O
the	O
unicorn	B-Application
.	O
</s>
<s>
Retro	O
Unicorn	B-Application
Attack	O
,	O
a	O
version	O
of	O
the	O
game	O
styled	O
after	O
popular	O
video	O
games	O
in	O
the	O
8-bit	B-Application
era	I-Application
,	O
was	O
released	O
in	O
2013	O
.	O
</s>
<s>
A	O
sequel	O
titled	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
2	O
was	O
developed	O
by	O
PikPok	O
and	O
released	O
on	O
iOS	B-Application
on	O
April	O
25	O
,	O
2013	O
,	O
and	O
Android	B-Application
on	O
July	O
12	O
,	O
2013	O
.	O
</s>
<s>
It	O
also	O
introduces	O
enemies	O
,	O
missions	O
,	O
the	O
option	O
to	O
customize	O
your	O
unicorn	B-Application
's	O
appearance	O
,	O
and	O
the	O
ability	O
to	O
fly	O
by	O
equipping	O
wings	O
.	O
</s>
<s>
Egyptian	O
and	O
medieval-themed	O
unicorns	B-Application
were	O
introduced	O
in	O
an	O
update	O
,	O
as	O
well	O
as	O
the	O
new	O
threat	O
of	O
solar	O
geysers	O
.	O
</s>
<s>
The	O
unicorn	B-Application
itself	O
is	O
much	O
more	O
detailed	O
and	O
fluid	O
,	O
and	O
the	O
painted	O
backgrounds	O
also	O
have	O
much	O
more	O
depth	O
and	O
detail	O
.	O
</s>
<s>
Introduced	O
in	O
a	O
post-launch	O
update	O
was	O
a	O
"	O
celestial	O
unicorn	B-Application
"	O
,	O
as	O
well	O
as	O
a	O
new	O
"	O
Lava	O
"	O
course	O
available	O
for	O
purchase	O
with	O
real-world	O
currency	O
.	O
</s>
<s>
This	O
is	O
the	O
first	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
to	O
include	O
in-game	O
purchases	O
;	O
the	O
player	O
can	O
buy	O
credits	O
to	O
upgrade	O
his	O
or	O
her	O
unicorn	B-Application
and	O
additional	O
sound-packs	O
.	O
</s>
<s>
"	O
I	O
will	O
never	O
be	O
able	O
to	O
separate	O
Always	O
from	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
"	O
,	O
wrote	O
Kieron	O
Gillen	O
in	O
2010	O
.	O
</s>
<s>
Ivan	O
Williams	O
of	O
1UP.com	O
stated	O
that	O
,	O
"	O
Whether	O
it	O
's	O
the	O
song	O
constantly	O
on	O
a	O
loop	O
or	O
the	O
simple	O
desire	O
to	O
get	O
a	O
better	O
score	O
than	O
the	O
millions	O
of	O
other	O
gamers	O
playing	O
,	O
I	O
challenge	O
anyone	O
to	O
play	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
and	O
not	O
have	O
that	O
game	O
pop	O
into	O
your	O
head	O
every	O
now	O
and	O
then.	O
"	O
</s>
<s>
In	O
reviews	O
of	O
the	O
major	O
flash	O
games	O
of	O
2010	O
,	O
Eurogamer	O
writer	O
Kieron	O
Gillen	O
said	O
,	O
"	O
Like	O
a	O
comet	O
made	O
of	O
gold	O
,	O
glitter	O
and	O
Lady	O
Gaga	O
's	O
eyelashes	O
,	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
circled	O
the	O
Earth	O
and	O
filled	O
the	O
firmament	O
with	O
its	O
irresistible	O
radiance	O
for	O
the	O
whole	O
of	O
2010	O
.	O
</s>
<s>
It	O
is	O
undoubtedly	O
the	O
greatest	O
game	O
of	O
all	O
time	O
that	O
features	O
a	O
Robot	B-Application
Unicorn	I-Application
unless	O
you	O
're	O
a	O
metalhead	O
who	O
digs	O
its	O
sequel.	O
"	O
</s>
<s>
Scott	O
Sharkey	O
of	O
UGO	O
Networks	O
said	O
that	O
while	O
"	O
the	O
aesthetic	O
is	O
a	O
good	O
gag	O
for	O
a	O
few	O
minutes	O
"	O
,	O
the	O
important	O
point	O
of	O
Robot	B-Application
Unicorn	I-Application
Attack	I-Application
is	O
that	O
"	O
the	O
game	O
itself	O
is	O
addictive	O
enough	O
to	O
last	O
much	O
,	O
much	O
longer	O
.	O
</s>
<s>
In	O
a	O
review	O
of	O
the	O
iPhone	B-Device
version	O
of	O
the	O
game	O
,	O
CNN	B-Architecture
writer	O
Topher	O
Kohan	O
concluded	O
,	O
"	O
Easy-to-use	O
controls	O
,	O
great	O
soundtrack	O
,	O
the	O
ability	O
to	O
turn	O
the	O
sound	O
off	O
and	O
get	O
useful	O
feedback	O
via	O
vibrate	O
and	O
fun	O
in-game	O
tidbits	O
.	O
</s>
