<s>
Ecco	B-Application
the	I-Application
Dolphin	I-Application
:	I-Application
Defender	I-Application
of	I-Application
the	I-Application
Future	I-Application
is	O
the	O
fifth	O
title	O
in	O
the	O
Ecco	O
the	O
Dolphin	B-Application
series	O
.	O
</s>
<s>
It	O
was	O
released	O
in	O
2000	O
for	O
the	B-Operating_System
Dreamcast	I-Operating_System
.	O
</s>
<s>
Defender	O
of	O
the	O
Future	O
is	O
a	O
reboot	O
set	O
in	O
a	O
separate	O
continuity	O
than	O
the	O
original	O
Sega	B-Operating_System
Genesis	I-Operating_System
titles	O
.	O
</s>
<s>
After	O
the	B-Operating_System
Dreamcast	I-Operating_System
was	O
discontinued	O
in	O
the	O
U.S.	O
,	O
the	O
game	O
was	O
re-released	O
in	O
2002	O
for	O
the	O
PlayStation	B-Device
2	I-Device
.	O
</s>
<s>
Ecco	O
's	O
sonar	B-Application
was	O
kept	O
as	O
a	O
means	O
of	O
interaction	O
with	O
other	O
cetaceans	O
(	O
no	O
longer	O
called	O
Singers	O
in	O
the	O
game	O
)	O
and	O
certain	O
environmental	O
objects	O
,	O
and	O
a	O
sonar	B-Application
map	O
could	O
be	O
brought	O
up	O
.	O
</s>
<s>
The	O
health	O
and	O
air	O
meters	O
were	O
also	O
kept	O
,	O
though	O
the	O
health	O
meter	O
can	O
be	O
increased	O
by	O
collecting	O
power-ups	O
called	O
Vitalits	O
,	O
and	O
the	O
meters	O
have	O
a	O
slightly	O
different	O
look	O
compared	O
to	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
games	O
.	O
</s>
<s>
The	O
graphics	O
of	O
the	O
game	O
are	O
generally	O
regarded	O
as	O
one	O
of	O
the	O
most	O
realistic	O
ever	O
seen	O
in	O
a	O
Dreamcast	B-Operating_System
game	O
.	O
</s>
<s>
Many	O
reviewers	O
have	O
commented	O
that	O
Ecco	O
looks	O
like	O
a	O
real	O
dolphin	B-Application
.	O
</s>
<s>
The	O
"	O
charge	O
song	O
"	O
is	O
given	O
a	O
name	O
,	O
the	O
Power	O
of	O
Sonar	B-Application
,	O
and	O
is	O
part	O
of	O
a	O
set	O
of	O
five	O
temporary	O
power-ups	O
that	O
could	O
be	O
activated	O
by	O
collecting	O
icons	O
.	O
</s>
<s>
Power	O
of	O
Sonar	B-Application
:	O
Sonar	B-Application
does	O
damage	O
to	O
enemies	O
and	O
can	O
break	O
apart	O
certain	O
stones	O
.	O
</s>
<s>
The	O
"	O
confusion	O
song	O
"	O
was	O
named	O
the	O
Song	O
of	O
the	O
Shark	B-Algorithm
,	O
and	O
it	O
too	O
is	O
part	O
of	O
a	O
larger	O
set	O
of	O
songs	O
.	O
</s>
<s>
Song	O
of	O
the	O
Shark	B-Algorithm
:	O
Confuses	O
sharks	B-Algorithm
,	O
leaving	O
them	O
vulnerable	O
to	O
attack	O
.	O
</s>
<s>
This	O
does	O
not	O
work	O
on	O
the	O
great	O
white	O
or	O
the	O
white	O
sharks	B-Algorithm
in	O
later	O
levels	O
.	O
</s>
<s>
Defender	O
of	O
the	O
Future	O
bears	O
a	O
different	O
storyline	O
from	O
that	O
of	O
the	O
Mega	B-Operating_System
Drive/Genesis	I-Operating_System
games	O
;	O
it	O
is	O
generally	O
regarded	O
as	O
taking	O
place	O
in	O
a	O
separate	O
continuity	O
.	O
</s>
<s>
Appaloosa	O
's	O
Managing	O
Director	O
Andras	O
Csaszar	O
told	O
Official	O
Dreamcast	B-Operating_System
Magazine	O
that	O
development	O
took	O
over	O
two	O
years	O
and	O
involved	O
some	O
members	O
of	O
the	O
team	O
responsible	O
for	O
the	O
original	O
Mega	B-Operating_System
Drive	I-Operating_System
game	O
.	O
</s>
<s>
While	O
the	O
team	O
did	O
not	O
take	O
motion	O
capture	O
of	O
actual	O
dolphins	B-Application
,	O
they	O
consulted	O
videos	O
of	O
dolphins	B-Application
in	O
movement	O
and	O
spent	O
"	O
more	O
than	O
a	O
year	O
"	O
to	O
develop	O
"	O
a	O
unique	O
skeleton	O
animation	O
system	O
"	O
to	O
achieve	O
the	O
"	O
desired	O
lifelike	O
results	O
"	O
.	O
</s>
<s>
The	O
story	O
was	O
written	O
by	O
science	O
fiction	O
author	O
David	O
Brin	O
,	O
who	O
had	O
already	O
written	O
stories	O
featuring	O
intelligent	O
dolphins	B-Application
in	O
his	O
Uplift	O
Universe	O
.	O
</s>
<s>
GameRankings	O
and	O
Metacritic	O
gave	O
it	O
a	O
score	O
of	O
81%	O
and	O
84	O
out	O
of	O
100	O
for	O
the	B-Operating_System
Dreamcast	I-Operating_System
version	O
,	O
and	O
69%	O
and	O
71	O
out	O
of	O
100	O
for	O
the	O
PlayStation	B-Device
2	I-Device
version	O
.	O
</s>
