<s>
Robot	B-Application
Arena	I-Application
is	O
an	O
action	B-Application
video	I-Application
game	I-Application
series	O
focused	O
on	O
robot	O
building	O
and	O
fighting	O
.	O
</s>
<s>
There	O
are	O
three	O
games	O
in	O
the	O
series	O
,	O
Robot	B-Application
Arena	I-Application
released	O
in	O
2001	O
,	O
Robot	B-Application
Arena	I-Application
2	O
:	O
Design	O
and	O
Destroy	O
released	O
in	O
2003	O
,	O
and	O
Robot	B-Application
Arena	I-Application
3	O
released	O
in	O
2016	O
.	O
</s>
<s>
Robot	B-Application
Arena	I-Application
was	O
the	O
first	O
game	O
in	O
the	O
series	O
to	O
be	O
released	O
.	O
</s>
<s>
GameSpot	O
wrote	O
"	O
Even	O
at	O
the	O
low	O
retail	O
cost	O
of	O
$19.99	O
,	O
Robot	B-Application
Arena	I-Application
is	O
n't	O
worth	O
it	O
.	O
</s>
<s>
Robot	B-Application
Arena	I-Application
2	O
:	O
Design	O
and	O
Destroy	O
(	O
or	O
just	O
Robot	B-Application
Arena	I-Application
2	O
or	O
RA2	O
as	O
most	O
people	O
called	O
it	O
)	O
was	O
released	O
two	O
years	O
after	O
the	O
original	O
.	O
</s>
<s>
The	O
game	O
also	O
introduced	O
the	O
Havok	B-General_Concept
physics	I-General_Concept
engine	I-General_Concept
,	O
which	O
meant	O
that	O
robots	O
were	O
now	O
able	O
to	O
leave	O
the	O
ground	O
so	O
flippers	O
and	O
wedges	O
could	O
be	O
used	O
effectively	O
.	O
</s>
<s>
Robot	B-Application
Arena	I-Application
3	O
(	O
stylised	O
as	O
Robot	B-Application
Arena	I-Application
III	O
)	O
was	O
quietly	O
announced	O
in	O
May	O
2015	O
,	O
using	O
the	O
header	O
:	O
"	O
Create	O
.	O
</s>
<s>
Destruction	O
,	O
"	O
replacing	O
the	O
old	O
Robot	B-Application
Arena	I-Application
2	O
information	O
on	O
the	O
website	O
.	O
</s>
<s>
Robot	B-Application
Arena	I-Application
3	O
was	O
released	O
on	O
Steam	O
on	O
May	O
26	O
,	O
2016	O
,	O
thirteen	O
years	O
after	O
Robot	B-Application
Arena	I-Application
2	O
was	O
released	O
.	O
</s>
<s>
Robot	B-Application
Arena	I-Application
3	O
is	O
built	O
in	O
the	O
Unity	O
5	O
game	O
engine	O
;	O
however	O
,	O
the	O
developers	O
encountered	O
a	O
setback	O
with	O
vehicular	O
movement	O
,	O
eventually	O
designing	O
their	O
own	O
vehicle	O
physics	O
to	O
accommodate	O
a	O
robot	O
that	O
has	O
been	O
flipped	O
upside	O
down	O
.	O
</s>
