<s>
A	O
Sega	B-Operating_System
Mega	I-Operating_System
Drive	I-Operating_System
port	O
was	O
released	O
in	O
1990	O
.	O
</s>
<s>
The	O
player	O
takes	O
control	O
of	O
Apollo	B-Operating_System
,	O
who	O
is	O
mounted	O
upon	O
the	O
back	O
of	O
his	O
winged	O
horse	O
Pegasus	B-Algorithm
;	O
pressing	O
the	O
firing	O
button	O
makes	O
his	O
sword	O
fire	O
a	O
tiny	O
shot	O
,	O
while	O
holding	O
it	O
down	O
charges	O
the	O
sword	O
up	O
,	O
and	O
upon	O
releasing	O
the	O
button	O
the	O
sword	O
shoots	O
a	O
bigger	O
fireball	O
.	O
</s>
<s>
At	O
the	O
end	O
of	O
every	O
stage	O
,	O
Apollo	B-Operating_System
must	O
also	O
defeat	O
a	O
boss	O
character	O
from	O
Greek	O
myth	O
:	O
Medusa	B-Application
,	O
the	O
Graeae	O
,	O
the	O
Siren	O
,	O
Antaeus	O
,	O
Scylla	B-Language
(	O
who	O
has	O
taken	O
on	O
the	O
form	O
of	O
the	O
"	O
Crystal	O
Brain	O
"	O
from	O
the	O
aforementioned	O
Bakutotsu	B-Application
Kijūtei	I-Application
)	O
,	O
Cerberus	B-Application
,	O
and	O
Typhon	O
himself	O
;	O
once	O
he	O
has	O
done	O
so	O
,	O
he	O
will	O
proceed	O
to	O
the	O
enchanted	O
mirror	O
at	O
the	O
back	O
of	O
the	O
boss	O
character	O
temple	O
,	O
before	O
the	O
game	O
segues	O
into	O
the	O
next	O
stage	O
.	O
</s>
<s>
Apollo	B-Operating_System
can	O
take	O
up	O
to	O
four	O
hits	O
before	O
dying	O
(	O
indicated	O
by	O
the	O
"	O
playing-cards	O
"	O
hearts	O
at	O
the	O
bottom	O
of	O
the	O
screen	O
,	O
and	O
determined	O
by	O
how	O
the	O
cabinet	O
is	O
set	O
)	O
,	O
but	O
will	O
die	O
instantly	O
if	O
he	O
flies	O
into	O
a	O
wall	O
or	O
touches	O
a	O
boss	O
's	O
head	O
-	O
and	O
this	O
game	O
also	O
features	O
voice	O
samples	O
(	O
in	O
Japanese	O
for	O
the	O
original	O
arcade	O
and	O
Japanese	O
Mega	B-Operating_System
Drive	I-Operating_System
versions	O
,	O
but	O
in	O
English	O
for	O
the	O
North	O
American	O
Genesis	O
and	O
European	O
Mega	B-Operating_System
Drive	I-Operating_System
versions	O
)	O
.	O
</s>
<s>
The	O
player	O
takes	O
control	O
of	O
the	O
knight	O
Apollo	B-Operating_System
,	O
the	O
god	O
of	O
the	O
sun	O
,	O
who	O
sets	O
off	O
on	O
the	O
legendary	O
winged	O
horse	O
Pegasus	B-Algorithm
,	O
to	O
rescue	O
his	O
lover	O
,	O
Artemis	B-Operating_System
,	O
the	O
goddess	O
of	O
the	O
moon	O
,	O
from	O
the	O
Titan	O
,	O
Typhon	O
.	O
</s>
<s>
The	O
game	O
takes	O
names	O
and	O
little	O
else	O
from	O
Greek	O
mythology	O
in	O
which	O
Apollo	B-Operating_System
,	O
god	O
of	O
the	O
sun	O
,	O
was	O
actually	O
Artemis	B-Operating_System
's	O
brother	O
.	O
</s>
<s>
The	O
game	O
shows	O
players	O
an	O
Artemis	B-Operating_System
that	O
acts	O
as	O
a	O
princess	O
(	O
but	O
in	O
Greek	O
mythology	O
,	O
she	O
was	O
the	O
goddess	O
of	O
the	O
hunt	O
,	O
and	O
took	O
pride	O
in	O
never	O
being	O
with	O
any	O
man	O
)	O
.	O
</s>
<s>
The	O
arcade	O
version	O
of	O
this	O
game	O
was	O
never	O
released	O
in	O
the	O
United	O
States	O
,	O
due	O
to	O
Artemis	B-Operating_System
's	O
"	O
bondage/torture	O
"	O
scenes	O
,	O
which	O
were	O
shown	O
between	O
each	O
stage	O
,	O
and	O
were	O
similar	O
to	O
those	O
from	O
the	O
new	O
version	O
of	O
Namco	O
's	O
own	O
Rolling	B-Application
Thunder	I-Application
;	O
while	O
no	O
nudity	O
is	O
shown	O
,	O
the	O
scenes	O
were	O
still	O
somewhat	O
"	O
strong	O
"	O
to	O
be	O
shown	O
in	O
an	O
arcade	O
game	O
during	O
the	O
early	O
16-bit	O
era	O
.	O
</s>
<s>
This	O
game	O
's	O
score	O
display	O
also	O
gives	O
the	O
illusion	O
of	O
allowing	O
values	O
which	O
do	O
not	O
end	O
in	O
"	O
0	O
"	O
,	O
like	O
Hopping	B-Application
Mappy	I-Application
,	O
Bakutotsu	B-Application
Kijūtei	I-Application
,	O
and	O
Metal	B-Application
Hawk	I-Application
did	O
before	O
it	O
-	O
however	O
,	O
the	O
smallest	O
point	O
value	O
that	O
the	O
game	O
can	O
award	O
to	O
a	O
player	O
for	O
killing	O
an	O
enemy	O
is	O
10	O
.	O
</s>
<s>
The	O
Japanese	O
magazine	O
Game	O
Machine	O
listed	O
Phelios	B-Application
in	O
their	O
March	O
1	O
,	O
1989	O
issue	O
as	O
being	O
the	O
third	O
most-popular	O
arcade	O
game	O
at	O
the	O
time	O
.	O
</s>
