<s>
Custom	B-Application
Robo	I-Application
,	O
known	O
in	O
Japan	O
as	O
is	O
an	O
action	B-Application
role-playing	I-Application
video	I-Application
game	I-Application
developed	O
by	O
Noise	O
and	O
published	O
by	O
Nintendo	O
for	O
the	O
GameCube	B-Application
.	O
</s>
<s>
It	O
is	O
the	O
fourth	O
title	O
of	O
the	O
Custom	B-Application
Robo	I-Application
series	I-Application
,	O
and	O
the	O
first	O
title	O
of	O
the	O
series	O
released	O
outside	O
Japan	O
.	O
</s>
<s>
In	O
this	O
title	O
of	O
the	O
Custom	B-Application
Robo	I-Application
series	I-Application
,	O
each	O
player	O
is	O
called	O
a	O
"	O
commander	O
"	O
,	O
who	O
pilots	O
and	O
customizes	O
a	O
miniature	O
"	O
robo	O
"	O
to	O
battle	O
each	O
other	O
in	O
a	O
virtual	O
arena	O
called	O
a	O
Holosseum	O
;	O
the	O
average	O
robo	O
is	O
32	O
centimeters	O
tall	O
.	O
</s>
<s>
The	O
main	O
objective	O
of	O
the	O
game	O
is	O
to	O
engage	O
in	O
battle	O
with	O
other	O
robos	O
,	O
collect	O
every	O
custom	B-Application
robo	I-Application
,	O
battle	O
part	O
,	O
and	O
item	O
that	O
the	O
player	O
wants	O
;	O
winning	O
every	O
battle	O
moves	O
the	O
player	O
from	O
one	O
part	O
of	O
the	O
storyline	O
to	O
the	O
next	O
.	O
</s>
<s>
Later	O
,	O
after	O
passing	O
a	O
test	O
and	O
obtaining	O
a	O
Class	O
"	O
S	O
"	O
license	O
,	O
Rahu	O
's	O
past	O
is	O
revealed	O
and	O
Hero	O
finds	O
out	O
that	O
Rahu	B-Application
is	I-Application
an	O
invisible	O
organic	O
being	O
who	O
had	O
accidentally	O
been	O
fused	O
with	O
a	O
toy	O
robot	O
.	O
</s>
<s>
Ernest	O
:	O
The	O
leader	O
,	O
manager	O
,	O
boss	O
,	O
and	O
CEO	B-Application
of	O
the	O
Steel	O
Hearts	O
.	O
</s>
<s>
It	O
is	O
constantly	O
evolving	O
,	O
demonstrated	O
by	O
the	O
multiple	O
forms	O
it	O
is	O
fought	O
in	O
throughout	O
the	O
game	O
,	O
and	O
is	O
the	O
only	O
"	O
custom	B-Application
robo	I-Application
"	O
that	O
can	O
exist	O
outside	O
a	O
Holosseum	O
in	O
full	O
form	O
.	O
</s>
<s>
The	O
game	O
received	O
"	O
mixed	O
"	O
reviews	O
according	O
to	O
video	O
game	O
review	B-Application
aggregator	I-Application
Metacritic	O
.	O
</s>
<s>
However	O
,	O
in	O
retrospective	O
reception	O
the	O
game	O
has	O
been	O
heavily	O
praised	O
and	O
is	O
frequently	O
featured	O
in	O
several	O
"	O
Best	O
GameCube	B-Application
games	O
"	O
lists	O
and	O
countdowns	O
.	O
</s>
