<s>
is	O
a	O
1998	O
platform	O
game	O
developed	O
by	O
Sonic	B-Application
Team	O
and	O
published	O
by	O
Sega	O
for	O
the	B-Operating_System
Dreamcast	I-Operating_System
.	O
</s>
<s>
It	O
was	O
the	O
first	O
main	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
game	O
to	O
feature	O
3D	O
gameplay	O
.	O
</s>
<s>
It	O
follows	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
,	O
Miles	O
"	O
Tails	O
"	O
Prower	O
,	O
Knuckles	O
the	O
Echidna	O
,	O
Amy	O
Rose	O
,	O
Big	O
the	O
Cat	O
,	O
and	O
E-102	O
Gamma	O
in	O
their	O
quests	O
to	O
collect	O
the	O
Chaos	O
Emeralds	O
and	O
stop	O
Doctor	O
Robotnik	O
from	O
unleashing	O
Chaos	O
,	O
an	O
ancient	O
evil	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
retains	O
many	O
elements	O
from	O
prior	O
Sonic	B-Application
games	O
,	O
such	O
as	O
power-ups	O
and	O
the	O
ring-based	O
health	O
system	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
began	O
developing	O
Sonic	B-Application
Adventure	O
in	O
1997	O
,	O
after	O
the	O
cancellation	O
of	O
the	O
Sega	B-Device
Saturn	I-Device
game	O
Sonic	B-Application
X-treme	I-Application
.	O
</s>
<s>
Led	O
by	O
director	O
Takashi	O
Iizuka	O
and	O
producer	O
Yuji	O
Naka	O
,	O
the	O
team	O
strove	O
to	O
reinvent	O
Sonic	B-Application
for	O
the	O
3D	O
era	O
of	O
video	O
games	O
.	O
</s>
<s>
Adventure	O
features	O
a	O
stronger	O
emphasis	O
on	O
storytelling	O
and	O
role-playing	O
elements	O
in	O
contrast	O
to	O
previous	O
Sonic	B-Application
games	O
,	O
while	O
Yuji	O
Uekawa	O
redesigned	O
the	O
series	O
's	O
characters	O
for	O
their	O
transition	O
to	O
3D	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
attempted	O
to	O
demonstrate	O
the	O
technical	O
prowess	O
of	O
the	B-Operating_System
Dreamcast	I-Operating_System
with	O
realistic	O
graphics	O
and	O
drew	O
inspiration	O
from	O
locations	O
in	O
Peru	O
and	O
Guatemala	O
.	O
</s>
<s>
The	O
soundtrack	O
was	O
primarily	O
composed	O
by	O
Jun	O
Senoue	O
,	O
who	O
preferred	O
rock	O
music	O
over	O
the	O
electropop	O
of	O
previous	O
Sonic	B-Application
games	O
.	O
</s>
<s>
Following	O
its	O
reveal	O
at	O
the	O
Tokyo	O
International	O
Forum	O
in	O
August	O
1998	O
,	O
Sonic	B-Application
Adventure	O
was	O
highly	O
anticipated	O
and	O
was	O
released	O
in	O
Japan	O
in	O
December	O
1998	O
and	O
worldwide	O
in	O
September	O
1999	O
.	O
</s>
<s>
It	O
received	O
critical	O
acclaim	O
and	O
became	O
the	B-Operating_System
Dreamcast	I-Operating_System
's	O
bestseller	O
,	O
with	O
2.5	O
million	O
copies	O
sold	O
by	O
August	O
2006	O
.	O
</s>
<s>
Though	O
critics	O
noted	O
glitches	B-Error_Name
and	O
camera	O
problems	O
,	O
and	O
reactions	O
to	O
the	O
audio	O
were	O
mixed	O
,	O
they	O
considered	O
Sonic	B-Application
Adventure	O
an	O
exceptional	O
game	O
;	O
some	O
speculated	O
that	O
it	O
could	O
help	O
re-establish	O
Sega	O
as	O
the	O
dominant	O
console	O
manufacturer	O
after	O
the	O
unsuccessful	O
Saturn	B-Device
.	O
</s>
<s>
Journalists	O
have	O
retrospectively	O
ranked	O
Sonic	B-Application
Adventure	O
among	O
the	O
best	O
Sonic	B-Application
games	O
,	O
and	O
it	O
is	O
recognized	O
as	O
an	O
important	O
release	O
in	O
both	O
the	O
series	O
and	O
the	O
platform	O
genre	O
.	O
</s>
<s>
Many	O
characters	O
and	O
concepts	O
introduced	O
in	O
Adventure	O
recur	O
in	O
later	O
Sonic	B-Application
games	O
.	O
</s>
<s>
A	O
sequel	O
,	O
Sonic	B-Application
Adventure	I-Application
2	I-Application
,	O
was	O
released	O
in	O
2001	O
.	O
</s>
<s>
Adventure	O
was	O
ported	O
to	O
the	O
GameCube	B-Application
and	O
Windows	O
in	O
2003	O
with	O
altered	O
graphics	O
and	O
more	O
challenges	O
,	O
while	O
a	O
high-definition	O
version	O
was	O
released	O
for	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
in	O
2010	O
and	O
for	O
Windows	O
in	O
2011	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
is	O
a	O
3D	O
platform	O
game	O
with	O
action	B-Application
and	O
role-playing	O
elements	O
.	O
</s>
<s>
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
performs	O
a	O
spin	O
dash	O
,	O
homing	O
attack	O
,	O
and	O
light-speed	O
dash	O
;	O
Miles	O
"	O
Tails	O
"	O
Prower	O
flies	O
,	O
swims	O
,	O
and	O
attacks	O
robots	O
using	O
his	O
tails	O
;	O
Knuckles	O
the	O
Echidna	O
glides	O
,	O
climbs	O
walls	O
,	O
and	O
punches	O
;	O
Amy	O
Rose	O
can	O
defeat	O
enemies	O
using	O
her	O
hammer	O
;	O
Big	O
the	O
Cat	O
is	O
slow	O
and	O
carries	O
a	O
fishing	O
rod	O
he	O
can	O
cast	O
;	O
and	O
E-102	O
Gamma	O
can	O
shoot	O
laser	O
beams	O
.	O
</s>
<s>
Through	O
exploration	O
,	O
the	O
player	O
discovers	O
entrances	O
to	O
levels	O
called	O
Action	B-Application
Stages	O
,	O
some	O
of	O
which	O
must	O
be	O
opened	O
using	O
keys	O
hidden	O
in	O
the	O
Adventure	O
Field	O
.	O
</s>
<s>
Once	O
the	O
player	O
accesses	O
an	O
Action	B-Application
Stage	O
,	O
they	O
are	O
tasked	O
with	O
a	O
specific	O
objective	O
,	O
which	O
is	O
different	O
for	O
each	O
character	O
.	O
</s>
<s>
Sonic	B-Application
must	O
reach	O
the	O
level	O
's	O
end	O
like	O
in	O
prior	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
games	O
;	O
Tails	O
must	O
reach	O
the	O
end	O
before	O
Sonic	B-Application
;	O
Knuckles	O
must	O
find	O
three	O
hidden	O
shards	O
of	O
the	O
Master	O
Emerald	O
;	O
Amy	O
must	O
solve	O
puzzles	O
and	O
avoid	O
being	O
caught	O
by	O
a	O
robot	O
;	O
Big	O
must	O
fish	O
for	O
his	O
pet	O
frog	O
;	O
and	O
Gamma	O
must	O
fight	O
his	O
way	O
through	O
stages	O
using	O
projectiles	O
as	O
a	O
defense	O
.	O
</s>
<s>
Like	O
previous	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
games	O
,	O
players	O
collect	O
golden	O
rings	O
as	O
a	O
form	O
of	O
health	O
:	O
if	O
the	O
player	O
character	O
is	O
in	O
possession	O
of	O
rings	O
when	O
they	O
are	O
hit	O
by	O
an	O
enemy	O
or	O
other	O
hazard	O
,	O
they	O
will	O
survive	O
,	O
but	O
their	O
rings	O
will	O
scatter	O
and	O
blink	O
before	O
disappearing	O
.	O
</s>
<s>
Players	O
can	O
hatch	O
,	O
name	O
,	O
and	O
interact	O
with	O
multiple	O
Chao	O
,	O
and	O
they	O
can	O
raise	O
the	O
status	O
of	O
their	O
Chao	O
by	O
giving	O
them	O
small	O
animals	O
,	O
which	O
can	O
be	O
collected	O
by	O
defeating	O
enemies	O
within	O
the	O
Action	B-Application
Stages	O
.	O
</s>
<s>
The	B-Operating_System
Dreamcast	I-Operating_System
's	O
handheld	O
Visual	B-Application
Memory	I-Application
Unit	I-Application
(	O
VMU	B-Application
)	O
allows	O
the	O
player	O
to	O
download	O
the	O
minigame	O
Chao	O
Adventure	O
,	O
in	O
which	O
their	O
Chao	O
walks	O
through	O
a	O
course	O
to	O
evolve	O
and	O
improve	O
its	O
skills	O
.	O
</s>
<s>
Players	O
can	O
earn	O
emblems	O
by	O
playing	O
through	O
Action	B-Application
Stages	O
,	O
searching	O
through	O
the	O
Adventure	O
Fields	O
,	O
or	O
winning	O
Chao	O
Races	O
.	O
</s>
<s>
Each	O
Action	B-Application
Stage	O
has	O
three	O
emblems	O
that	O
can	O
be	O
earned	O
by	O
replaying	O
the	O
stages	O
and	O
fulfilling	O
objectives	O
,	O
such	O
as	O
beating	O
the	O
level	O
within	O
a	O
time	O
limit	O
.	O
</s>
<s>
Doctor	O
Robotnik	O
seeks	O
a	O
new	O
way	O
to	O
defeat	O
his	O
longtime	O
nemesis	O
Sonic	B-Application
and	O
conquer	O
the	O
world	O
.	O
</s>
<s>
When	O
Sonic	B-Application
sees	O
local	O
police	O
fail	O
to	O
defeat	O
Chaos	O
,	O
he	O
and	O
Tails	O
work	O
to	O
stop	O
Robotnik	O
from	O
empowering	O
it	O
with	O
the	O
Chaos	O
Emeralds	O
.	O
</s>
<s>
In	O
Station	O
Square	O
,	O
Sonic	B-Application
's	O
friend	O
Amy	O
finds	O
a	O
Flicky	B-Application
being	O
pursued	O
for	O
a	O
Chaos	O
Emerald	O
in	O
its	O
possession	O
and	O
decides	O
to	O
protect	O
it	O
.	O
</s>
<s>
Although	O
Sonic	B-Application
disrupts	O
Robotnik	O
's	O
plans	O
,	O
Chaos	O
manages	O
to	O
absorb	O
all	O
the	O
Chaos	O
Emeralds	O
and	O
transforms	O
into	O
Perfect	O
Chaos	O
;	O
it	O
rebels	O
against	O
Robotnik	O
and	O
destroys	O
Station	O
Square	O
.	O
</s>
<s>
Through	O
flashbacks	O
from	O
Tikal	O
(	O
who	O
was	O
also	O
released	O
from	O
the	O
Master	O
Emerald	O
)	O
,	O
Sonic	B-Application
realizes	O
that	O
Chaos	O
has	O
been	O
in	O
constant	O
torment	O
and	O
sorrow	O
and	O
that	O
imprisoning	O
it	O
again	O
will	O
not	O
stop	O
it	O
.	O
</s>
<s>
He	O
uses	O
the	O
Chaos	O
Emeralds	O
to	O
transform	O
into	O
Super	O
Sonic	B-Application
and	O
defeats	O
Perfect	O
Chaos	O
.	O
</s>
<s>
Afterward	O
,	O
Sonic	B-Application
pursues	O
a	O
fleeing	O
Robotnik	O
.	O
</s>
<s>
During	O
the	O
early	O
1990s	O
,	O
Sega	O
was	O
one	O
of	O
the	O
most	O
successful	O
video	O
game	O
companies	O
due	O
to	O
the	O
rise	O
of	O
its	O
Genesis	B-Operating_System
console	O
.	O
</s>
<s>
Genesis	B-Operating_System
sales	O
were	O
driven	O
by	O
the	O
popularity	O
of	O
Sega	O
's	O
flagship	O
franchise	O
of	O
2D	O
platform	O
games	O
,	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
.	O
</s>
<s>
During	O
this	O
time	O
,	O
series	O
co-creator	O
Yuji	O
Naka	O
worked	O
with	O
Sega	O
Technical	O
Institute	O
(	O
STI	O
)	O
in	O
the	O
United	O
States	O
to	O
develop	O
Sonic	B-Application
games	O
.	O
</s>
<s>
After	O
the	O
completion	O
of	O
Sonic	B-Application
&	I-Application
Knuckles	I-Application
in	O
1994	O
,	O
Naka	O
returned	O
to	O
Japan	O
to	O
work	O
with	O
Sonic	B-Application
Team	O
.	O
</s>
<s>
STI	O
began	O
developing	O
Sonic	B-Application
X-treme	I-Application
for	O
the	O
Sega	B-Device
Saturn	I-Device
,	O
planned	O
as	O
the	O
first	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
game	O
to	O
feature	O
full	O
3D	O
gameplay	O
.	O
</s>
<s>
The	O
cancellation	O
is	O
an	O
important	O
factor	O
in	O
the	O
Saturn	B-Device
's	O
commercial	O
failure	O
,	O
leaving	O
it	O
with	O
no	O
original	O
Sonic	B-Application
platform	O
game	O
.	O
</s>
<s>
Meanwhile	O
,	O
Naka	O
and	O
Sonic	B-Application
Team	O
developed	O
original	O
Saturn	B-Device
games	O
,	O
such	O
as	O
Nights	B-Application
into	I-Application
Dreams	I-Application
(	O
1996	O
)	O
.	O
</s>
<s>
Naka	O
wanted	O
a	O
3D	O
Sonic	B-Application
game	O
,	O
but	O
felt	O
that	O
only	O
Sonic	B-Application
Team	O
should	O
undertake	O
the	O
endeavor	O
;	O
his	O
refusal	O
to	O
let	O
STI	O
use	O
the	O
Nights	O
game	O
engine	O
was	O
instrumental	O
in	O
X-treme	O
cancellation	O
.	O
</s>
<s>
Due	O
to	O
the	O
lack	O
of	O
Sonic	B-Application
games	O
on	O
the	O
Saturn	B-Device
,	O
according	O
to	O
Retro	O
Gamer	O
,	O
Sonic	B-Application
became	O
part	O
of	O
the	O
"	O
background	O
"	O
by	O
mid-1997	O
,	O
so	O
"	O
it	O
was	O
astonishing	O
to	O
see	O
that	O
,	O
just	O
six	O
years	O
after	O
his	O
debut	O
,	O
Sonic	B-Application
was	O
already	O
retro.	O
"	O
</s>
<s>
Nights	B-Application
into	I-Application
Dreams	I-Application
designer	O
Takashi	O
Iizuka	O
felt	O
that	O
Sonic	B-Application
fans	O
had	O
been	O
let	O
down	O
because	O
Sonic	B-Application
Team	O
was	O
not	O
focusing	O
on	O
the	O
series	O
.	O
</s>
<s>
Additionally	O
,	O
Kazuyuki	O
Hoshino	O
,	O
who	O
would	O
serve	O
as	O
art	O
director	O
on	O
Sonic	B-Application
Adventure	O
,	O
said	O
he	O
thought	O
during	O
the	O
Saturn	B-Device
era	O
Sonic	B-Application
had	O
become	O
outdated	O
.	O
</s>
<s>
In	O
August	O
1996	O
,	O
shortly	O
after	O
the	O
completion	O
of	O
Nights	B-Application
into	I-Application
Dreams	I-Application
,	O
Iizuka	O
proposed	O
Sonic	B-Application
Adventure	O
as	O
a	O
role-playing-style	O
Sonic	B-Application
game	O
with	O
a	O
greater	O
emphasis	O
on	O
storytelling	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
started	O
to	O
work	O
on	O
it	O
in	O
April	O
1997	O
on	O
the	O
Saturn	B-Device
with	O
a	O
20-strong	O
team	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
created	O
the	O
first	O
prototype	O
using	O
the	O
Nights	O
engine	O
,	O
but	O
the	O
Saturn	B-Device
's	O
limited	O
capabilities	O
made	O
development	O
difficult	O
.	O
</s>
<s>
Sega	O
president	O
Hayao	O
Nakayama	O
informed	O
Naka	O
of	O
the	O
Saturn	B-Device
's	O
successor	O
,	O
the	B-Operating_System
Dreamcast	I-Operating_System
,	O
and	O
he	O
believed	O
the	O
new	O
console	O
would	O
allow	O
Sonic	B-Application
Team	O
to	O
create	O
the	O
ultimate	O
Sonic	B-Application
game	O
.	O
</s>
<s>
When	O
the	O
team	O
learned	O
the	B-Operating_System
Dreamcast	I-Operating_System
was	O
nearing	O
completion	O
,	O
they	O
moved	O
development	O
to	O
take	O
advantage	O
of	O
its	O
greater	O
quantity	O
of	O
RAM	B-Architecture
,	O
stronger	O
CPU	B-Device
,	O
and	O
the	O
VMU	B-Application
.	O
</s>
<s>
Not	O
wanting	O
to	O
waste	O
their	O
completed	O
work	O
,	O
they	O
placed	O
it	O
as	O
a	O
bonus	O
in	O
the	O
compilation	O
game	O
Sonic	B-Application
Jam	I-Application
,	O
the	O
final	O
Sonic	B-Application
game	O
for	O
the	O
Saturn	B-Device
.	O
</s>
<s>
Development	O
on	O
the	B-Operating_System
Dreamcast	I-Operating_System
began	O
in	O
July	O
1997	O
.	O
</s>
<s>
Iizuka	O
served	O
as	O
director	O
on	O
Sonic	B-Application
Adventure	O
,	O
while	O
Naka	O
produced	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
undertook	O
development	O
in	O
conjunction	O
with	O
the	B-Operating_System
Dreamcast	I-Operating_System
,	O
aiming	O
to	O
release	O
the	O
game	O
in	O
December	O
1998	O
,	O
even	O
if	O
it	O
meant	O
making	O
improvements	O
after	O
release	O
.	O
</s>
<s>
Developing	O
Sonic	B-Application
Adventure	O
at	O
the	O
same	O
time	O
as	O
the	O
system	O
,	O
which	O
was	O
not	O
completed	O
until	O
two	O
months	O
before	O
the	O
game	O
's	O
release	O
,	O
gave	O
Iizuka	O
influence	O
over	O
the	O
console	O
's	O
development	O
;	O
for	O
example	O
,	O
he	O
was	O
able	O
to	O
request	O
more	O
RAM	B-Architecture
for	O
the	O
console	O
specifically	O
for	O
Sonic	B-Application
Adventure	O
.	O
</s>
<s>
According	O
to	O
former	O
Sega	O
of	O
America	O
producer	O
Mark	O
Subotnick	O
,	O
Naka	O
canceled	O
Geist	O
Force	O
,	O
an	O
on-rails	O
shooter	O
that	O
was	O
planned	O
as	O
a	O
Dreamcast	B-Operating_System
launch	O
game	O
,	O
so	O
he	O
could	O
use	O
its	O
proprietary	B-Application
software	I-Application
for	O
Sonic	B-Application
Adventure	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
felt	O
challenged	O
by	O
the	O
new	O
hardware	O
to	O
recreate	O
Sonic	B-Application
and	O
his	O
world	O
in	O
a	O
new	O
way	O
.	O
</s>
<s>
They	O
began	O
development	O
using	O
the	O
character	O
designs	O
from	O
the	O
Genesis	B-Operating_System
games	O
,	O
but	O
quickly	O
discovered	O
the	O
characters	O
 '	O
bodies	O
were	O
too	O
short	O
and	O
their	O
heads	O
too	O
big	O
,	O
making	O
them	O
difficult	O
to	O
see	O
.	O
</s>
<s>
Retro	O
game	O
characters	O
,	O
such	O
as	O
Pac-Man	B-Application
,	O
were	O
also	O
being	O
reborn	O
in	O
a	O
more	O
"	O
urban	O
"	O
fashion	O
around	O
the	O
same	O
time	O
,	O
something	O
that	O
made	O
Sonic	B-Application
Team	O
jealous	O
and	O
feel	O
the	O
original	O
character	O
designs	O
were	O
dated	O
.	O
</s>
<s>
Looking	O
to	O
the	O
animation	O
of	O
Walt	O
Disney	O
and	O
Looney	B-Application
Tunes	I-Application
for	O
inspiration	O
,	O
he	O
made	O
Sonic	B-Application
more	O
mature	O
,	O
taller	O
and	O
slimmer	O
,	O
and	O
gave	O
him	O
longer	O
quills	O
.	O
</s>
<s>
Uekawa	O
tried	O
to	O
make	O
Sonic	B-Application
look	O
like	O
a	O
comic	O
book	O
character	O
and	O
compared	O
the	O
style	O
to	O
graffiti	O
.	O
</s>
<s>
After	O
redesigning	O
Sonic	B-Application
,	O
he	O
made	O
the	O
other	O
characters	O
fit	O
this	O
new	O
art	O
style	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
features	O
two	O
new	O
playable	O
characters	O
,	O
Big	O
and	O
Gamma	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
had	O
already	O
implemented	O
an	O
in-game	O
fishing	O
rod	O
with	O
no	O
context	O
or	O
use	O
,	O
leading	O
to	O
the	O
creation	O
of	O
Big	O
.	O
</s>
<s>
Gamma	O
and	O
his	O
playstyle	O
were	O
created	O
in	O
response	O
to	O
fans	O
who	O
wanted	O
elements	O
of	O
a	O
shoot	O
'	O
em	O
up	O
in	O
Sonic	B-Application
and	O
because	O
of	O
Iizuka	O
's	O
desire	O
to	O
include	O
"	O
some	O
type	O
of	O
satisfying	O
gameplay	O
that	O
could	O
n't	O
be	O
done	O
with	O
Sonic	B-Application
"	O
.	O
</s>
<s>
Chaos	O
was	O
originally	O
intended	O
to	O
have	O
realistic	O
blue	O
scales	O
in	O
his	O
final	O
form	O
,	O
but	O
this	O
was	O
abandoned	O
because	O
of	O
the	O
technological	O
constraints	O
of	O
the	B-Operating_System
Dreamcast	I-Operating_System
.	O
</s>
<s>
While	O
some	O
Sonic	B-Application
games	O
,	O
such	O
as	O
1993	O
's	O
Sonic	B-Application
CD	I-Application
,	O
contained	O
limited	O
voice	O
work	O
,	O
Sonic	B-Application
Adventure	O
was	O
the	O
first	B-Application
Sonic	I-Application
game	I-Application
to	O
feature	O
extensive	O
voice	O
acting	O
.	O
</s>
<s>
The	O
decision	O
was	O
made	O
early	O
in	O
development	O
as	O
the	O
game	O
was	O
more	O
story-focused	O
than	O
previous	O
Sonic	B-Application
games	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
's	O
staff	O
had	O
differing	O
opinions	O
about	O
how	O
Sonic	B-Application
should	O
sound	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
cast	O
Jun'ichi	O
Kanemaru	O
as	O
Sonic	B-Application
.	O
</s>
<s>
After	O
Sonic	B-Application
Team	O
USA	O
was	O
formed	O
,	O
they	O
hired	O
American	O
actors	O
to	O
translate	O
the	O
Japanese	O
script	O
.	O
</s>
<s>
The	O
English-language	O
voice	O
cast	O
consists	O
of	O
Ryan	O
Drummond	O
as	O
Sonic	B-Application
,	O
Corey	O
Bringas	O
as	O
Tails	O
,	O
Michael	O
McGaharn	O
as	O
Knuckles	O
,	O
Jennifer	O
Douillard	O
as	O
Amy	O
,	O
Jon	O
St.	O
John	O
as	O
Big	O
and	O
E-102	O
Gamma	O
,	O
and	O
Deem	O
Bristow	O
as	O
Robotnik	O
.	O
</s>
<s>
Iizuka	O
used	O
Sonic	B-Application
Adventure	O
to	O
introduce	O
Robotnik	O
's	O
Japanese	O
name	O
,	O
"	O
Dr.	O
Eggman	O
"	O
,	O
to	O
western	O
audiences	O
;	O
he	O
accomplished	O
this	O
by	O
having	O
Sonic	B-Application
insult	O
Robotnik	O
when	O
they	O
meet	O
for	O
the	O
first	O
time	O
in-game	O
.	O
</s>
<s>
Because	O
Sonic	B-Application
Adventure	O
was	O
a	O
Dreamcast	B-Operating_System
launch	O
game	O
,	O
the	O
team	O
strove	O
to	O
demonstrate	O
the	O
console	O
's	O
capabilities	O
with	O
realistic	O
graphics	O
.	O
</s>
<s>
To	O
achieve	O
a	O
more	O
realistic	O
feel	O
for	O
the	O
environments	O
,	O
the	O
core	O
members	O
of	O
Sonic	B-Application
Team	O
visited	O
temples	O
,	O
jungles	O
,	O
and	O
ancient	O
ruins	O
in	O
Mesoamerican	O
landscapes	O
,	O
including	O
Cancún	O
,	O
Guatemala	O
,	O
and	O
Peru	O
.	O
</s>
<s>
While	O
Sonic	B-Application
Team	O
members	O
had	O
to	O
draw	O
artwork	O
by	O
hand	O
for	O
games	O
in	O
the	O
past	O
,	O
for	O
Sonic	B-Application
Adventure	O
they	O
were	O
able	O
to	O
use	O
photographs	O
taken	O
during	O
their	O
visits	O
as	O
textures	O
.	O
</s>
<s>
The	O
3D	O
visuals	O
were	O
created	O
using	O
a	O
Voodoo2	O
graphics	O
chip	B-Application
.	O
</s>
<s>
The	O
levels	O
were	O
designed	O
to	O
feature	O
gameplay	O
similar	O
to	O
the	O
original	O
Genesis	B-Operating_System
games	O
and	O
to	O
take	O
at	O
least	O
five	O
minutes	O
to	O
complete	O
.	O
</s>
<s>
One	O
of	O
the	O
biggest	O
challenges	O
the	O
Adventure	O
designers	O
faced	O
was	O
transitioning	O
Sonic	B-Application
2D	O
style	O
to	O
3D	O
.	O
</s>
<s>
In	O
the	O
Genesis	B-Operating_System
Sonic	B-Application
games	O
,	O
the	O
player	O
simply	O
had	O
to	O
go	O
right	O
to	O
reach	O
the	O
end	O
of	O
a	O
level	O
,	O
but	O
in	O
Sonic	B-Application
Adventure	O
they	O
could	O
move	O
in	O
every	O
direction	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
split	O
levels	O
into	O
parts	O
to	O
save	O
memory	O
.	O
</s>
<s>
Therefore	O
,	O
Sonic	B-Application
was	O
given	O
the	O
ability	O
to	O
target	O
enemies	O
in	O
mid-air	O
.	O
</s>
<s>
Some	O
levels	O
reference	O
past	O
Sega	O
games	O
,	O
such	O
as	O
Ice	O
Cap	O
(	O
1994	O
's	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
3	I-Application
)	O
and	O
the	O
Tornado	O
levels	O
(	O
1995	O
's	O
Panzer	B-Application
Dragoon	I-Application
)	O
.	O
</s>
<s>
Iizuka	O
said	O
they	O
felt	O
it	O
would	O
be	O
"	O
a	O
waste	O
if	O
Sonic	B-Application
just	O
quickly	O
ran	O
through	O
the	O
levels	O
that	O
we	O
spent	O
so	O
much	O
time	O
creating	O
"	O
.	O
</s>
<s>
The	O
first	O
characters	O
besides	O
Sonic	B-Application
added	O
to	O
the	O
game	O
were	O
Tails	O
and	B-Application
Knuckles	I-Application
;	O
Tails	O
's	O
stages	O
turned	O
portions	O
of	O
Sonic	B-Application
's	O
levels	O
into	O
races	O
,	O
while	O
Knuckles	O
's	O
treasure-hunting	O
missions	O
were	O
designed	O
as	O
a	O
contrast	O
to	O
the	O
others	O
 '	O
straightforward	O
ones	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
was	O
the	O
first	O
time	O
Amy	O
was	O
playable	O
in	O
a	O
Sonic	B-Application
platformer	O
,	O
and	O
Iizuka	O
aimed	O
to	O
use	O
her	O
to	O
add	O
tension	O
,	O
such	O
as	O
hiding	O
from	O
pursuers	O
,	O
that	O
Sonic	B-Application
's	O
gameplay	O
could	O
not	O
offer	O
.	O
</s>
<s>
Because	O
Sonic	B-Application
Adventure	O
had	O
a	O
stronger	O
emphasis	O
on	O
storytelling	O
than	O
previous	O
games	O
in	O
the	O
series	O
,	O
the	O
team	O
implemented	O
hub	O
worlds	O
to	O
"	O
draw	O
the	O
players	O
deeper	O
into	O
the	O
world.	O
"	O
</s>
<s>
The	O
hub	O
worlds	O
 '	O
emphasis	O
on	O
exploring	O
to	O
find	O
new	O
areas	O
and	O
power-ups	O
was	O
inspired	O
by	O
The	B-Application
Legend	I-Application
of	I-Application
Zelda	I-Application
.	O
</s>
<s>
One	O
addition	O
was	O
the	O
Chao-raising	O
system	O
,	O
which	O
Iizuka	O
conceived	O
to	O
take	O
advantage	O
of	O
the	O
VMU	B-Application
.	O
</s>
<s>
Sonic	B-Application
Team	O
had	O
used	O
a	O
similar	O
virtual	O
pet	O
system	O
,	O
the	O
"	O
A-Life	O
"	O
,	O
in	O
Nights	B-Application
into	I-Application
Dreams	I-Application
;	O
Iizuka	O
used	O
the	O
A-Life	O
as	O
a	O
base	O
,	O
while	O
improving	O
it	O
with	O
the	O
VMU	B-Application
and	O
the	O
option	O
to	O
improve	O
its	O
skills	O
.	O
</s>
<s>
It	O
was	O
also	O
designed	O
to	O
appeal	O
to	O
casual	O
gamers	O
not	O
familiar	O
with	O
games	O
like	O
Sonic	B-Application
,	O
and	O
to	O
add	O
replay	O
value	O
.	O
</s>
<s>
Sonic	B-Application
Adventures	O
score	O
was	O
primarily	O
composed	O
by	O
Jun	O
Senoue	O
,	O
with	O
additional	O
music	O
by	O
Fumie	O
Kumatani	O
,	O
Kenichi	O
Tokoi	O
,	O
and	O
Masaru	O
Setsumaru	O
.	O
</s>
<s>
Despite	O
this	O
,	O
Senoue	O
said	O
he	O
did	O
not	O
feel	O
much	O
pressure	O
,	O
as	O
he	O
was	O
a	O
Sonic	B-Application
fan	O
and	O
had	O
contributed	O
to	O
previous	O
games	O
 '	O
soundtracks	O
.	O
</s>
<s>
In	O
contrast	O
to	O
previous	O
Sonic	B-Application
games	O
,	O
which	O
featured	O
electropop	O
soundtracks	O
,	O
the	O
Adventure	O
sound	O
team	O
preferred	O
"	O
hot	O
,	O
funky	O
,	O
and	O
rock	B-Application
'	I-Application
n	I-Application
 '	I-Application
roll	I-Application
"	O
music	O
.	O
</s>
<s>
Iizuka	O
noted	O
that	O
Sonic	B-Application
Team	O
's	O
primary	O
goal	O
with	O
Adventure	O
was	O
"	O
to	O
evoke	O
the	O
essence	O
of	O
Sonic	B-Application
by	O
going	O
from	O
2D	O
to	O
3D	O
"	O
,	O
and	O
felt	O
the	O
music	O
needed	O
to	O
exceed	O
fan	O
expectations	O
due	O
to	O
previous	O
Sonic	B-Application
soundtracks	O
 '	O
popularity	O
.	O
</s>
<s>
He	O
stated	O
a	O
new	O
style	O
was	O
adopted	O
because	O
the	B-Operating_System
Dreamcast	I-Operating_System
's	O
sound	O
was	O
a	O
significant	O
advance	O
from	O
that	O
of	O
the	O
Genesis	B-Operating_System
;	O
Senoue	O
added	O
he	O
felt	O
more	O
comfortable	O
composing	O
rock	O
music	O
and	O
wanted	O
to	O
create	O
music	O
everyone	O
could	O
enjoy	O
.	O
</s>
<s>
Despite	O
the	O
different	O
styles	O
,	O
Senoue	O
did	O
retain	O
some	O
music	O
from	O
the	O
Genesis	B-Operating_System
Sonic	B-Application
games	O
:	O
the	O
music	O
for	O
the	O
Windy	O
Valley	O
and	O
Twinkle	O
Park	O
levels	O
were	O
rearranged	O
from	O
Sonic	B-Application
3D	I-Application
Blast	I-Application
(	O
1996	O
)	O
,	O
while	O
the	O
level	O
clear	O
jingle	O
was	O
taken	O
from	O
Sonic	B-Application
3	I-Application
.	O
</s>
<s>
He	O
chose	O
to	O
reuse	O
his	O
3D	O
Blast	O
tracks	O
because	O
he	O
felt	O
they	O
were	O
strong	O
enough	O
to	O
be	O
more	O
widely	O
heard	O
,	O
as	O
they	O
were	O
only	O
used	O
the	O
Genesis	B-Operating_System
version	O
(	O
which	O
was	O
not	O
released	O
in	O
Japan	O
)	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
marked	O
Senoue	O
's	O
first	O
collaboration	O
with	O
Gioeli	O
;	O
the	O
two	O
later	O
formed	O
the	O
band	O
Crush	O
40	O
(	O
originally	O
known	O
as	O
Sons	O
of	O
Angels	O
)	O
,	O
and	O
continue	O
to	O
make	O
music	O
together	O
.	O
</s>
<s>
Iizuka	O
also	O
felt	O
that	O
the	O
songs	O
helped	O
define	O
Knuckles	O
and	O
Amy	O
's	O
personalities	O
,	O
as	O
they	O
had	O
not	O
received	O
much	O
character	O
development	O
in	O
Sonic	B-Application
games	O
until	O
Adventure	O
.	O
</s>
<s>
A	O
two-disc	O
soundtrack	O
,	O
Sonic	B-Application
Adventure	O
"	O
Digi-LOG	O
Conversation	O
"	O
Original	O
Sound	O
Track	O
,	O
was	O
released	O
in	O
Japan	O
in	O
January	O
1999	O
.	O
</s>
<s>
In	O
May	O
2011	O
,	O
the	O
soundtrack	O
was	O
rereleased	O
to	O
commemorate	O
the	O
Sonic	B-Application
franchise	I-Application
's	O
20th	O
anniversary	O
.	O
</s>
<s>
A	O
two-volume	O
digital	O
soundtrack	O
was	O
also	O
released	O
on	O
iTunes	B-Operating_System
and	O
Spotify	B-Application
in	O
September	O
2014	O
and	O
January	O
2017	O
,	O
respectively	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
was	O
kept	O
a	O
secret	O
during	O
production	O
,	O
though	O
screenshots	O
were	O
leaked	O
in	O
mid-1998	O
and	O
plans	O
for	O
a	O
3D	O
Sonic	B-Application
game	O
had	O
long	O
been	O
rumored	O
.	O
</s>
<s>
It	O
was	O
unveiled	O
by	O
Naka	O
and	O
the	O
rest	O
of	O
Sonic	B-Application
Team	O
on	O
August	O
22	O
,	O
1998	O
,	O
at	O
the	O
Tokyo	O
International	O
Forum	O
.	O
</s>
<s>
The	O
presentation	O
ended	O
with	O
a	O
live	O
performance	O
of	O
"	O
Open	O
Your	O
Heart	O
"	O
alongside	O
a	O
RealVideo	B-Algorithm
clip	O
montage	O
.	O
</s>
<s>
On	O
December	O
23	O
,	O
1998	O
,	O
Sonic	B-Application
Adventure	O
was	O
released	O
in	O
Japan	O
.	O
</s>
<s>
The	O
Japanese	O
version	O
shipped	O
with	O
many	O
glitches	B-Error_Name
;	O
according	O
to	O
Iizuka	O
,	O
this	O
was	O
because	O
the	O
game	O
was	O
produced	O
on	O
a	O
tight	O
schedule	O
,	O
so	O
Sonic	B-Application
Team	O
did	O
not	O
have	O
time	O
to	O
fix	O
them	O
.	O
</s>
<s>
Several	O
members	O
of	O
Sonic	B-Application
Team	O
flew	O
to	O
Sega	O
of	O
America	O
to	O
establish	O
Sonic	B-Application
Team	O
USA	O
and	O
patch	O
and	O
translate	O
the	O
game	O
.	O
</s>
<s>
Prior	O
to	O
the	O
launch	O
of	O
the	B-Operating_System
Dreamcast	I-Operating_System
in	O
the	O
United	O
States	O
,	O
Sega	O
made	O
an	O
exclusive	O
deal	O
with	O
Hollywood	O
Video	O
to	O
allow	O
customers	O
to	O
rent	O
the	B-Operating_System
Dreamcast	I-Operating_System
console	O
along	O
with	O
a	O
non-retail	O
version	O
of	O
the	O
game	O
,	O
Sonic	B-Application
Adventure	O
:	O
Limited	O
Edition	O
.	O
</s>
<s>
Online	O
features	O
—	O
including	O
Chao	O
daycare	O
and	O
downloadable	B-Protocol
content	I-Protocol
(	O
DLC	B-Protocol
)	O
such	O
as	O
minigames	O
and	O
new	O
level	O
assets	O
—	O
were	O
also	O
added	O
.	O
</s>
<s>
The	O
American	O
release	O
of	O
Studio	O
Pierrot	O
's	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
(	O
1996	O
)	O
original	O
video	O
animation	O
coincided	O
with	O
the	O
Western	O
release	O
of	O
Sonic	B-Application
Adventure	O
,	O
while	O
DIC	O
Entertainment	O
's	O
Sonic	B-Application
Underground	O
(	O
1999	O
)	O
was	O
commissioned	O
to	O
help	O
promote	O
the	O
game	O
.	O
</s>
<s>
The	O
localized	O
version	O
was	O
later	O
released	O
in	O
Japan	O
as	O
Sonic	B-Application
Adventure	O
International	O
.	O
</s>
<s>
Before	O
release	O
,	O
Sega	O
projected	O
to	O
sell	O
a	O
million	O
copies	O
of	O
Sonic	B-Application
Adventure	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
is	O
the	O
bestselling	O
Dreamcast	B-Operating_System
game	O
;	O
by	O
August	O
4	O
,	O
2006	O
,	O
it	O
had	O
sold	O
2.5	O
million	O
copies	O
,	O
including	O
440,000	O
in	O
Japan	O
and	O
1.27	O
million	O
in	O
the	O
US	O
.	O
</s>
<s>
In	O
the	O
UK	O
,	O
it	O
was	O
the	O
top	O
selling	O
Dreamcast	B-Operating_System
launch	O
game	O
.	O
</s>
<s>
After	O
the	O
North	O
American	O
release	O
,	O
there	O
were	O
complaints	O
of	O
a	O
number	O
of	O
Sonic	B-Application
Adventure	O
discs	O
failing	O
to	O
load	O
.	O
</s>
<s>
As	O
the	O
first	O
fully	O
3D	O
Sonic	B-Application
platform	O
game	O
,	O
Sonic	B-Application
Adventure	O
was	O
highly	O
anticipated	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
won	O
a	O
Blockbuster	O
Entertainment	O
Award	O
in	O
the	O
"	O
Favorite	O
Sega	B-Operating_System
Dreamcast	I-Operating_System
Game	O
"	O
category	O
,	O
and	O
it	O
was	O
a	O
runner-up	O
for	O
GameSpots	O
annual	O
"	O
Best	O
Console	O
Platform	O
Game	O
"	O
award	O
,	O
which	O
went	O
to	O
Rayman	B-Application
2	I-Application
:	I-Application
The	I-Application
Great	I-Application
Escape	I-Application
(	O
1999	O
)	O
.	O
</s>
<s>
GameSpot	O
agreed	O
and	O
said	O
only	O
Soulcaliburs	B-Application
graphical	O
quality	O
surpassed	O
that	O
of	O
Sonic	B-Application
Adventure	O
.	O
</s>
<s>
Edge	O
felt	O
the	O
graphical	O
features	O
showed	O
off	O
the	B-Operating_System
Dreamcast	I-Operating_System
's	O
potential	O
to	O
the	O
fullest	O
and	O
that	O
the	O
game	O
was	O
"	O
perfect	O
"	O
as	O
a	O
showcase	O
for	O
the	O
system	O
.	O
</s>
<s>
GameSpot	O
and	O
Game	O
Revolution	O
called	O
the	O
full-motion	B-Application
video	I-Application
(	O
FMV	O
)	O
cutscenes	O
and	O
voice	O
acting	O
well-produced	O
and	O
fitting	O
,	O
though	O
GameSpot	O
noted	O
poor	O
lip-synching	O
.	O
</s>
<s>
AllGame	O
was	O
conflicted	O
;	O
they	O
appreciated	O
Tails	O
's	O
portrayal	O
but	O
found	O
Sonic	B-Application
's	O
and	B-Application
Knuckles	I-Application
's	O
voices	O
unfitting	O
.	O
</s>
<s>
GameSpot	O
admired	O
the	O
straightforward	O
,	O
linear	O
approach	O
to	O
the	O
3D	O
platform	O
genre	O
and	O
particularly	O
praised	O
it	O
for	O
keeping	O
the	O
basic	O
gameplay	O
of	O
the	O
original	O
Genesis	B-Operating_System
games	O
.	O
</s>
<s>
Retrospectively	O
,	O
1001	O
Video	O
Games	O
You	O
Must	O
Play	O
Before	O
You	O
Die	O
called	O
its	O
environments	O
vast	O
and	O
twisted	O
,	O
stating	O
it	O
"	O
brilliantly	O
"	O
captured	O
traditional	O
Sonic	B-Application
elements	O
.	O
</s>
<s>
Game	O
Revolution	O
called	O
the	O
Chao	O
"	O
a	O
neat	O
addition	O
"	O
and	O
praised	O
its	O
use	O
of	O
the	O
VMU	B-Application
.	O
</s>
<s>
Some	O
critics	O
compared	O
Sonic	B-Application
Adventure	O
to	O
Super	O
Mario	O
Nintendo	O
's	O
"	O
groundbreaking	O
"	O
1996	O
game	O
that	O
propelled	O
the	O
Nintendo	B-Operating_System
64	I-Operating_System
and	O
the	O
3D	O
platform	O
genre	O
.	O
</s>
<s>
Edge	O
said	O
Sonic	B-Application
Adventure	O
was	O
a	O
worthy	O
rival	O
to	O
Super	B-Application
Mario	I-Application
64	I-Application
,	O
but	O
AllGame	O
wrote	O
that	O
Sonic	B-Application
Adventure	O
was	O
not	O
as	O
ambitious	O
and	O
that	O
those	O
looking	O
for	O
exploration	O
would	O
be	O
disappointed	O
with	O
its	O
linear	O
gameplay	O
.	O
</s>
<s>
They	O
compared	O
it	O
to	O
the	O
similarly	O
linear	O
Crash	B-Application
Bandicoot	I-Application
but	O
felt	O
Sonic	B-Application
Adventure	O
was	O
more	O
confined	O
.	O
</s>
<s>
Game	O
journalists	O
Rusel	O
DeMaria	O
and	O
Johnny	O
L	O
.	O
Wilson	O
retrospectively	O
wrote	O
Sonic	B-Application
Adventure	O
was	O
not	O
as	O
strong	O
as	O
Super	B-Application
Mario	I-Application
64	I-Application
and	O
"	O
failed	O
to	O
catch	O
on	O
with	O
players	O
in	O
nearly	O
the	O
way	O
that	O
 [ Mario ] 	O
had	O
done	O
"	O
,	O
though	O
it	O
had	O
fascinating	O
features	O
,	O
such	O
as	O
"	O
the	O
use	O
of	O
the	O
Tamagotchi-like	O
memory	O
card	O
to	O
incubate	O
eggs	O
for	O
little	O
pet	O
creatures	O
"	O
and	O
"	O
some	O
good	O
action	B-Application
segments	O
"	O
.	O
</s>
<s>
The	O
camera	O
system	O
and	O
glitches	B-Error_Name
were	O
criticized	O
by	O
many	O
reviewers	O
.	O
</s>
<s>
Authors	O
from	O
GamesRadar	O
retrospectively	O
wrote	O
that	O
Sonic	B-Application
Adventure	O
was	O
"	O
horrendously	O
buggy	O
"	O
,	O
singling	O
out	O
falling	O
through	O
floors	O
and	O
getting	O
stuck	O
,	O
but	O
also	O
said	O
the	O
sheer	O
amount	O
of	O
content	O
made	O
up	O
for	O
this	O
.	O
</s>
<s>
GameSpot	O
thought	O
Sonic	B-Application
Adventure	O
redefined	O
the	O
possibilities	O
of	O
the	O
platform	O
genre	O
,	O
and	O
according	O
to	O
CVG	O
,	O
"	O
many	O
things	O
you	O
thought	O
were	O
impossible	O
to	O
see	O
and	O
experience	O
in	O
computer	O
games	O
are	O
now	O
here	O
"	O
.	O
</s>
<s>
AllGame	O
wrote	O
that	O
the	O
game	O
was	O
an	O
impressive	O
showing	O
of	O
the	B-Operating_System
Dreamcast	I-Operating_System
's	O
potential	O
and	O
that	O
it	O
was	O
among	O
the	O
best	O
of	O
the	O
series	O
.	O
</s>
<s>
Arcade	O
and	O
CVG	O
speculated	O
the	O
game	O
could	O
save	O
the	B-Operating_System
Dreamcast	I-Operating_System
,	O
which	O
had	O
not	O
sold	O
well	O
by	O
the	O
end	O
of	O
1998	O
.	O
</s>
<s>
CVG	O
also	O
thought	O
it	O
could	O
re-establish	O
Sega	O
as	O
the	O
dominant	O
console	O
manufacturer	O
after	O
the	O
relatively	O
unsuccessful	O
Saturn	B-Device
.	O
</s>
<s>
In	O
2001	O
,	O
Sega	O
announced	O
it	O
would	O
transition	O
from	O
a	O
first-party	O
to	O
a	O
third-party	O
software	O
publisher	O
,	O
in	O
response	O
to	O
the	O
international	O
failures	O
of	O
the	O
Saturn	B-Device
and	O
Dreamcast	B-Operating_System
.	O
</s>
<s>
Wanting	O
to	O
reach	O
new	O
players	O
by	O
creating	O
an	O
enhanced	O
version	O
of	O
one	O
of	O
its	O
older	O
games	O
,	O
in	O
June	O
2003	O
Sega	O
released	O
Sonic	B-Application
Adventure	I-Application
DX	I-Application
:	I-Application
Director	I-Application
's	I-Application
Cut	I-Application
,	O
a	O
port	O
of	O
Sonic	B-Application
Adventure	O
for	O
the	O
GameCube	B-Application
and	O
Windows	O
.	O
</s>
<s>
While	O
mostly	O
identical	O
to	O
the	O
original	O
release	O
,	O
Sonic	B-Application
Adventure	O
DX	O
features	O
updated	O
graphics	O
,	O
including	O
updated	O
textures	O
and	O
more	O
detailed	O
character	O
models	O
,	O
aims	O
for	O
a	O
frame	O
rate	O
of	O
60	O
instead	O
of	O
30	O
,	O
and	O
sports	O
a	O
redesigned	O
Chao-raising	O
system	O
that	O
uses	O
connectivity	O
with	O
the	O
Game	B-Device
Boy	I-Device
Advance	I-Device
(	O
GBA	B-Device
)	O
.	O
</s>
<s>
It	O
includes	O
60	O
new	O
missions	O
and	O
the	O
option	O
to	O
unlock	O
emulations	O
of	O
all	O
12	O
Sonic	B-Application
games	O
released	O
for	O
the	O
Game	O
Gear	O
.	O
</s>
<s>
Additionally	O
,	O
Metal	O
Sonic	B-Application
can	O
be	O
unlocked	O
as	O
a	O
playable	O
character	O
if	O
all	O
130	O
emblems	O
are	O
collected	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
DX	O
received	O
mixed	O
reviews	O
.	O
</s>
<s>
GameSpot	O
offered	O
some	O
praise	O
for	O
the	O
extra	O
features	O
,	O
such	O
as	O
the	O
missions	O
,	O
but	O
concluded	O
players	O
were	O
better	O
off	O
playing	O
the	B-Operating_System
Dreamcast	I-Operating_System
version	O
.	O
</s>
<s>
IGN	O
said	O
the	O
connectivity	O
to	O
the	O
GBA	B-Device
Sonic	B-Application
games	O
added	O
depth	O
but	O
concluded	O
this	O
was	O
not	O
enough	O
to	O
compensate	O
for	O
the	O
port	O
's	O
problems	O
.	O
</s>
<s>
Nintendo	O
World	O
Report	O
was	O
more	O
positive	O
,	O
praising	O
the	O
Game	O
Gear	O
games	O
for	O
retaining	O
their	O
multiplayer	O
support	O
and	O
finding	O
Sonic	B-Application
and	O
Tails’	O
gameplay	O
enjoyable	O
.	O
</s>
<s>
In	O
September	O
2010	O
,	O
Sega	O
rereleased	O
Sonic	B-Application
Adventure	O
as	O
a	O
downloadable	O
game	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
followed	O
by	O
a	O
Windows	O
release	O
in	O
March	O
2011	O
via	O
Steam	B-Application
.	O
</s>
<s>
This	O
version	O
is	O
based	O
on	O
Sonic	B-Application
Adventure	O
DX	O
and	O
supports	O
high-definition	O
visuals	O
at	O
a	O
4:3	O
aspect	O
ratio	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	O
DX	O
's	O
additional	O
content	O
was	O
removed	O
,	O
but	O
the	O
mission	O
mode	O
and	O
Metal	O
Sonic	B-Application
can	O
be	O
reimplemented	O
by	O
purchasing	O
additional	O
DLC	B-Protocol
.	O
</s>
<s>
The	O
game	O
was	O
also	O
included	O
in	O
the	B-Operating_System
Dreamcast	I-Operating_System
Collection	O
compilation	O
in	O
2011	O
and	O
is	O
backwards-compatible	O
with	O
the	B-Device
Xbox	I-Device
One	I-Device
and	O
Xbox	B-Device
Series	I-Device
X/S	I-Device
.	O
</s>
<s>
1UP.com	O
lambasted	O
the	O
port	O
for	O
what	O
they	O
called	O
its	O
slapdash	O
quality	O
,	O
criticizing	O
its	O
display	O
,	O
controls	O
,	O
and	O
dated	O
design	O
,	O
and	O
saying	O
that	O
it	O
"	O
feels	O
like	O
it	O
was	O
n't	O
even	O
tuned	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
controller	O
and	O
its	O
analog	O
sticks.	O
"	O
</s>
<s>
With	O
most	O
contemporary	O
3D	O
platform	O
games	O
focusing	O
on	O
exploration	O
and	O
collecting	O
items	O
,	O
Sonic	B-Application
Adventure	O
stood	O
out	O
with	O
its	O
linear	O
gameplay	O
.	O
</s>
<s>
According	O
to	O
GamesRadar	O
,	O
as	O
one	O
of	O
the	O
first	O
sixth-generation	B-Application
console	O
games	O
,	O
it	O
changed	O
the	O
industry	O
"	O
forever	O
"	O
.	O
</s>
<s>
Joystiq	O
wrote	O
that	O
both	O
Adventure	O
and	O
the	O
original	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
had	O
innovated	O
—	O
in	O
3D	O
and	O
2D	O
games	O
,	O
respectively	O
—	O
through	O
effective	O
linear	O
level	O
design	O
and	O
by	O
feeling	O
"	O
good	O
to	O
play	O
"	O
.	O
</s>
<s>
In	O
2009	O
,	O
GamePro	O
listed	O
Sonic	B-Application
Adventure	O
as	O
the	O
seventh-best	O
platform	O
game	O
of	O
all	O
time	O
,	O
saying	O
that	O
it	O
had	O
not	O
aged	O
well	O
in	O
certain	O
aspects	O
but	O
that	O
its	O
core	O
gameplay	O
remained	O
among	O
the	O
best	O
of	O
the	O
Sonic	B-Application
series	I-Application
.	O
</s>
<s>
Several	O
journalists	O
ranked	O
the	O
game	O
among	O
the	O
series	O
's	O
best	O
,	O
but	O
Kotaku	O
argued	O
the	O
addition	O
of	O
voice	O
acting	O
and	O
greater	O
focus	O
on	O
plot	O
changed	O
Sonic	B-Application
into	O
"	O
a	O
flat	O
,	O
lifeless	O
husk	O
of	O
a	O
character	O
,	O
who	O
spits	O
out	O
slogans	O
and	O
generally	O
has	O
only	O
one	O
personality	O
mode	O
,	O
the	O
radical	O
attitude	O
dude	O
,	O
the	O
sad	O
recycled	O
image	O
of	O
vague	O
'	O
90s	O
cultural	O
concept	O
"	O
.	O
</s>
<s>
Many	O
of	O
Sonic	B-Application
Adventures	O
designs	O
and	O
concepts	O
were	O
reused	O
in	O
later	O
Sonic	B-Application
games	O
.	O
</s>
<s>
The	O
first	O
level	O
in	O
the	O
2006	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
reboot	O
heavily	O
references	O
Sonic	B-Application
Adventures	O
Emerald	O
Coast	O
stage	O
.	O
</s>
<s>
To	O
celebrate	O
the	O
Sonic	B-Application
series	I-Application
's	O
20th	O
anniversary	O
in	O
2011	O
,	O
Sega	O
released	O
Sonic	B-Application
Generations	I-Application
,	O
which	O
reused	O
aspects	O
from	O
past	O
games	O
in	O
the	O
franchise	O
.	O
</s>
<s>
The	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
,	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
and	O
Windows	O
versions	O
contain	O
reimagined	O
versions	O
of	O
the	O
Speed	O
Highway	O
level	O
and	O
the	O
Perfect	O
Chaos	O
boss	O
fight	O
,	O
and	O
the	O
Nintendo	B-Operating_System
3DS	I-Operating_System
version	O
contains	O
a	O
remake	O
of	O
Emerald	O
Coast	O
.	O
</s>
<s>
Several	O
characters	O
that	O
first	O
appeared	O
in	O
Sonic	B-Application
Adventure	O
appeared	O
in	O
later	O
games	O
.	O
</s>
<s>
As	O
well	O
as	O
appearing	O
in	O
Sonic	B-Application
Generations	I-Application
,	O
Chaos	O
is	O
an	O
antagonist	O
in	O
the	O
2017	O
entry	O
Sonic	B-Application
Forces	I-Application
;	O
it	O
and	O
Gamma	O
are	O
playable	O
characters	O
in	O
the	O
2004	O
fighting	O
game	O
Sonic	B-Application
Battle	I-Application
;	O
and	O
a	O
recreation	O
of	O
its	O
boss	O
fight	O
appears	O
in	O
Mario	B-Application
&	I-Application
Sonic	I-Application
at	I-Application
the	I-Application
Olympic	I-Application
Winter	I-Application
Games	I-Application
.	O
</s>
<s>
Big	O
is	O
widely	O
considered	O
by	O
video	O
game	O
journalists	O
the	O
worst	O
character	O
in	O
the	O
Sonic	B-Application
franchise	I-Application
,	O
and	O
was	O
named	O
one	O
of	O
the	O
worst	O
game	O
characters	O
in	O
a	O
poll	O
conducted	O
by	O
1UP.com	O
.	O
</s>
<s>
On	O
October	O
4	O
,	O
1999	O
,	O
Sega	O
announced	O
that	O
a	O
sequel	O
to	O
Sonic	B-Application
Adventure	O
was	O
in	O
development	O
.	O
</s>
<s>
Sonic	B-Application
Adventure	I-Application
2	I-Application
made	O
its	O
debut	O
at	O
E3	O
2000	O
and	O
was	O
released	O
in	O
June	O
2001	O
.	O
</s>
<s>
The	O
sequel	O
was	O
designed	O
to	O
be	O
more	O
action-oriented	O
than	O
the	O
slower-paced	O
,	O
story-centric	O
Adventure	O
and	O
to	O
give	O
all	O
the	O
characters	O
equal	O
playtime	O
.	O
</s>
<s>
Like	O
its	O
predecessor	O
,	O
Sonic	B-Application
Adventure	I-Application
2	I-Application
received	O
positive	O
reviews	O
.	O
</s>
<s>
A	O
concept	O
for	O
Sonic	B-Application
Adventure	O
3	O
was	O
reworked	O
into	O
the	O
2008	O
game	O
Sonic	B-Application
Unleashed	I-Application
.	O
</s>
<s>
In	O
2017	O
,	O
Iizuka	O
stated	O
there	O
were	O
no	O
plans	O
for	O
a	O
third	O
Sonic	B-Application
Adventure	O
game	O
,	O
saying	O
it	O
would	O
not	O
advance	O
the	O
series	O
's	O
design	O
.	O
</s>
<s>
In	O
December	O
2018	O
,	O
Iizuka	O
expressed	O
interest	O
in	O
remaking	O
Sonic	B-Application
Adventure	O
.	O
</s>
<s>
The	O
plot	O
of	O
Sonic	B-Application
Adventure	O
was	O
adapted	O
in	O
the	O
second	O
season	O
of	O
the	O
2003	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
anime	O
series	O
Sonic	B-Application
X	O
.	O
American	O
licensing	O
corporation	O
4Kids	O
Entertainment	O
hired	O
a	O
new	O
voice	O
cast	O
for	O
the	O
English-language	O
dub	O
but	O
the	O
Japanese	O
cast	O
from	O
the	O
games	O
reprised	O
their	O
roles	O
in	O
the	O
original	O
version	O
of	O
the	O
show	O
.	O
</s>
<s>
Archie	O
Comics	O
also	O
adapted	O
the	O
game	O
in	O
its	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
comic	O
book	O
series	O
.	O
</s>
<s>
The	O
comic	O
offered	O
an	O
explanation	O
for	O
the	O
altered	O
character	O
designs	O
and	O
established	O
that	O
Station	O
Square	O
was	O
hidden	O
beneath	O
Sonic	B-Application
's	O
planet	O
,	O
Mobius	B-Application
.	O
</s>
