<s>
is	O
a	O
beat	B-Application
'	I-Application
em	I-Application
up	I-Application
video	O
game	O
developed	O
by	O
Treasure	O
for	O
the	O
Game	B-Device
Boy	I-Device
Advance	I-Device
.	O
</s>
<s>
The	O
game	O
is	O
a	O
sequel	O
to	O
Sega	B-Device
Saturn	I-Device
's	O
Guardian	B-Application
Heroes	I-Application
.	O
</s>
<s>
Advance	B-Device
Guardian	I-Device
Heroes	I-Device
is	O
a	O
side-scrolling	B-Application
beat	I-Application
'	I-Application
em	I-Application
up	I-Application
in	O
which	O
the	O
playable	O
characters	O
can	O
perform	O
various	O
attacks	O
.	O
</s>
<s>
Unlike	O
its	O
predecessor	O
,	O
Advance	B-Device
Guardian	I-Device
Heroes	I-Device
allows	O
players	O
to	O
move	O
smoothly	O
towards	O
and	O
away	O
from	O
the	O
screen	O
,	O
as	O
opposed	O
to	O
switching	O
between	O
3	O
planes	O
.	O
</s>
<s>
Properly	O
timed	O
use	O
of	O
the	O
barrier	O
spell	O
allows	O
a	O
player	O
to	O
reflect	O
projectiles	O
and	O
magic	O
(	O
in	O
a	O
visual	O
effect	O
reminiscent	O
of	O
Mischief	B-Application
Makers	I-Application
 '	O
Marina	B-Application
Liteyears	I-Application
throwing	O
a	O
laser	O
or	O
lightning	O
bolt	O
back	O
at	O
its	O
source	O
)	O
,	O
or	O
stun	O
enemies	O
who	O
attack	O
in	O
melee	O
.	O
</s>
<s>
The	O
story	O
follows	O
the	O
events	O
of	O
Guardian	B-Application
Heroes	I-Application
.	O
</s>
<s>
He	O
resurrects	O
Kanon	O
and	O
uses	O
the	O
power	O
of	O
the	O
Guardian	B-Application
Heroes	I-Application
to	O
take	O
over	O
the	O
world	O
.	O
</s>
<s>
The	O
game	O
received	O
mixed	O
reviews	O
in	O
English-speaking	O
countries	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
