<s>
Sonic	B-Application
Unleashed	I-Application
is	O
a	O
2008	O
platform	O
video	O
game	O
in	O
the	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
series	I-Application
.	O
</s>
<s>
The	O
story	O
follows	O
Sonic	B-Application
as	O
he	O
attempts	O
to	O
restore	O
the	O
world	O
after	O
his	O
nemesis	O
Doctor	O
Eggman	O
shatters	O
it	O
with	O
a	O
powerful	O
laser	O
to	O
unleash	O
Dark	B-Application
Gaia	I-Application
,	O
an	O
ancient	O
evil	O
,	O
while	O
dealing	O
with	O
having	O
become	O
a	O
"	O
Werehog	B-Application
"	O
,	O
a	O
werewolf-like	O
transformation	O
,	O
which	O
he	O
gains	O
after	O
coming	O
into	O
contact	O
with	O
the	O
energy	O
of	O
Dark	B-Application
Gaia	I-Application
.	O
</s>
<s>
Daytime	O
stages	O
incorporate	O
Sonic	B-Application
's	O
traditional	O
platforming	O
and	O
trademark	O
speed	O
,	O
with	O
a	O
combination	O
of	O
behind-the-back	O
third-person	O
viewpoints	O
and	O
2D	O
side-scroller	O
platforming	O
;	O
gameplay	O
seamlessly	O
transitions	O
between	O
these	O
two	O
views	O
.	O
</s>
<s>
Night-time	O
levels	O
see	O
Sonic	B-Application
transform	O
into	O
the	O
Werehog	B-Application
;	O
gameplay	O
slows	O
down	O
to	O
accommodate	O
greater	O
platform	O
play	O
,	O
and	O
involves	O
combat	O
against	O
waves	O
of	O
enemies	O
using	O
the	O
Werehog	B-Application
's	O
brute	O
strength	O
.	O
</s>
<s>
It	O
was	O
initially	O
conceived	O
as	O
a	O
sequel	O
to	O
Sonic	B-Application
Adventure	I-Application
2	I-Application
(	O
2001	O
)	O
,	O
but	O
developer	O
Sonic	B-Application
Team	O
began	O
to	O
introduce	O
enough	O
new	O
innovations	O
that	O
separated	O
it	O
from	O
previous	O
games	O
,	O
and	O
it	O
was	O
renamed	O
Sonic	B-Application
World	I-Application
Adventure	I-Application
in	O
domestic	O
markets	O
.	O
</s>
<s>
The	O
Werehog	B-Application
gameplay	O
was	O
conceived	O
to	O
help	O
introduce	O
newer	O
gamers	O
unfamiliar	O
with	O
the	O
Sonic	B-Application
franchise	I-Application
to	O
the	O
series	O
and	O
is	O
what	O
influenced	O
the	O
use	O
of	O
Unleashed	O
as	O
a	O
subtitle	O
for	O
western	O
markets	O
.	O
</s>
<s>
Three	O
versions	O
of	O
the	O
game	O
were	O
developed	O
:	O
one	O
by	O
Sonic	B-Application
Team	O
for	O
high	O
definition	O
consoles	O
such	O
as	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
,	O
one	O
by	O
Sonic	B-Application
Team	O
and	O
Dimps	O
for	O
standard	O
definition	O
consoles	O
such	O
as	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
,	O
and	O
one	O
by	O
Gameloft	O
for	O
mobile	O
phones	O
.	O
</s>
<s>
Public	O
anticipation	O
for	O
Sonic	B-Application
Unleashed	I-Application
was	O
high	O
,	O
as	O
video	O
game	O
journalists	O
saw	O
it	O
as	O
a	O
possible	O
return	O
to	O
Sonic	B-Application
's	O
platforming	O
roots	O
.	O
</s>
<s>
Reviewers	O
praised	O
certain	O
elements	O
,	O
such	O
as	O
the	O
sense	O
of	O
speed	O
in	O
daylight	O
stages	O
and	O
the	O
graphics	O
and	O
audio	O
that	O
make	O
up	O
the	O
environments	O
,	O
but	O
criticized	O
others	O
,	O
such	O
as	O
the	O
Werehog	B-Application
game	O
mechanic	O
,	O
as	O
well	O
as	O
several	O
gameplay	O
and	O
design	O
concepts	O
.	O
</s>
<s>
Sonic	B-Application
Unleashed	I-Application
was	O
delisted	O
from	O
retailers	O
in	O
2010	O
,	O
following	O
Sega	O
's	O
decision	O
to	O
remove	O
all	O
Sonic	B-Application
games	O
with	O
below-average	O
Metacritic	O
scores	O
from	O
sale	O
.	O
</s>
<s>
Despite	O
this	O
,	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
version	O
was	O
relisted	O
in	O
April	O
2014	O
and	O
added	O
to	O
PlayStation	B-General_Concept
Now	I-General_Concept
in	O
March	O
2017	O
,	O
while	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
was	O
relisted	O
and	O
made	O
backward	B-Device
compatible	I-Device
for	O
Xbox	B-Device
One	I-Device
in	O
November	O
2018	O
.	O
</s>
<s>
Sonic	B-Application
Unleashed	I-Application
is	O
a	O
platform	O
game	O
in	O
which	O
the	O
player	O
controls	O
the	O
titular	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
in	O
two	O
modes	O
:	O
fast-paced	O
levels	O
that	O
take	O
place	O
during	O
daytime	O
,	O
showcasing	O
and	O
using	O
Sonic	B-Application
's	O
trademark	O
speed	O
as	O
seen	O
in	O
previous	O
games	O
in	O
the	O
series	O
,	O
and	O
slower	O
,	O
night-time	O
levels	O
,	O
during	O
which	O
Sonic	B-Application
transforms	O
into	O
the	O
Werehog	B-Application
,	O
and	O
gameplay	O
switches	O
to	O
an	O
action-based	O
,	O
brawler	B-Application
style	O
of	O
play	O
,	O
in	O
which	O
Sonic	B-Application
battles	O
Gaia	O
enemies	O
(	O
those	O
created	O
by	O
the	O
main	O
enemy	O
in	O
the	O
game	O
,	O
Dark	B-Application
Gaia	I-Application
)	O
.	O
</s>
<s>
In	O
sections	O
of	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
versions	O
of	O
the	O
game	O
,	O
the	O
player	O
may	O
choose	O
to	O
advance	O
the	O
time	O
of	O
day	O
in	O
order	O
to	O
play	O
as	O
either	O
Sonic	B-Application
or	O
the	O
Werehog	B-Application
;	O
in	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
versions	O
,	O
time	O
is	O
advanced	O
automatically	O
.	O
</s>
<s>
Daytime	O
levels	O
focus	O
on	O
Sonic	B-Application
's	O
speed	O
,	O
and	O
to	O
this	O
extent	O
,	O
sees	O
the	O
player	O
control	O
Sonic	B-Application
through	O
fast-moving	O
stages	O
containing	O
both	O
2D	O
and	O
3D	O
styles	O
of	O
gameplay	O
.	O
</s>
<s>
2D	O
sections	O
are	O
reminiscent	O
of	O
the	O
Mega	B-Operating_System
Drive/Genesis	I-Operating_System
-era	O
Sonic	B-Application
games	O
where	O
the	O
player	O
controls	O
Sonic	B-Application
in	O
a	O
side-scrolling	O
fashion	O
,	O
while	O
3D	O
sections	O
see	O
the	O
camera	O
placed	O
behind	O
Sonic	B-Application
so	O
the	O
player	O
may	O
move	O
in	O
all	O
directions	O
.	O
</s>
<s>
For	O
instance	O
,	O
a	O
new	O
sidestep	O
feature	O
known	O
as	O
the	O
Quick	O
Step	O
is	O
available	O
,	O
allowing	O
Sonic	B-Application
to	O
dodge	O
left	O
and	O
right	O
,	O
and	O
a	O
Drift	O
feature	O
,	O
which	O
allows	O
Sonic	B-Application
to	O
make	O
tighter	O
turns	O
without	O
slowing	O
down	O
.	O
</s>
<s>
The	O
game	O
also	O
features	O
a	O
gameplay	O
mechanic	O
previously	O
used	O
in	O
the	O
Sonic	B-Application
Rush	I-Application
series	O
called	O
the	O
Sonic	B-Application
Boost	O
,	O
which	O
greatly	O
increases	O
Sonic	B-Application
's	O
speed	O
,	O
allowing	O
him	O
to	O
smash	O
through	O
objects	O
,	O
destroy	O
enemies	O
instantly	O
,	O
or	O
even	O
access	O
different	O
level	O
paths	O
.	O
</s>
<s>
In	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
versions	O
,	O
an	O
on-screen	O
"	O
Ring	O
Energy	O
"	O
meter	O
displays	O
how	O
much	O
Boost	O
is	O
available	O
.	O
</s>
<s>
In	O
contrast	O
,	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
versions	O
of	O
the	O
game	O
represent	O
available	O
Boost	O
using	O
bars	O
,	O
which	O
may	O
be	O
added	O
by	O
performing	O
"	O
Action	O
Chains	O
"	O
,	O
destroying	O
multiple	O
enemies	O
in	O
quick	O
succession	O
through	O
the	O
use	O
of	O
homing	O
attacks	O
,	O
or	O
by	O
collecting	O
rings	O
.	O
</s>
<s>
Gameplay	O
focuses	O
on	O
Sonic	B-Application
's	O
new	O
"	O
Werehog	B-Application
"	O
form	O
,	O
which	O
gives	O
him	O
great	O
strength	O
and	O
stretchable	O
arms	O
.	O
</s>
<s>
As	O
the	O
Werehog	B-Application
,	O
the	O
player	O
can	O
cling	O
to	O
distant	O
objects	O
,	O
move	O
items	O
around	O
and	O
perform	O
combo	O
attacks	O
to	O
defeat	O
enemies	O
and	O
advance	O
through	O
the	O
level	O
.	O
</s>
<s>
Collecting	O
rings	O
replenishes	O
the	O
Werehog	B-Application
's	O
health	O
,	O
while	O
a	O
special	O
move	O
,	O
Unleashed	O
Mode	O
,	O
allows	O
him	O
to	O
channel	O
his	O
energy	O
into	O
increasing	O
the	O
power	O
of	O
his	O
attacks	O
for	O
a	O
short	O
time	O
.	O
</s>
<s>
Night-time	O
levels	O
are	O
adjusted	O
in	O
the	B-Operating_System
Wii	I-Operating_System
version	O
to	O
allow	O
greater	O
use	O
of	O
the	B-Operating_System
Wii	I-Operating_System
Remote	O
,	O
such	O
that	O
players	O
may	O
control	O
the	O
arms	O
of	O
the	O
Werehog	B-Application
by	O
using	O
the	B-Operating_System
Wii	I-Operating_System
Remote	O
and	O
Nunchuk	O
in	O
order	O
to	O
grab	O
onto	O
objects	O
and	O
proceed	O
in	O
the	O
levels	O
.	O
</s>
<s>
The	B-Operating_System
Wii	I-Operating_System
version	O
also	O
expands	O
upon	O
the	O
ratio	O
of	O
night-time	O
levels	O
to	O
daytime	O
,	O
with	O
more	O
than	O
three	O
times	O
as	O
many	O
night-time	O
levels	O
(	O
twenty-five	O
in	O
all	O
)	O
.	O
</s>
<s>
After	O
night-time	O
levels	O
are	O
completed	O
,	O
Dark	B-Application
Gaia	I-Application
Points	O
are	O
gained	O
,	O
allowing	O
access	O
to	O
bonus	O
moves	O
.	O
</s>
<s>
In	O
addition	O
to	O
these	O
two	O
gameplay	O
types	O
,	O
Sonic	B-Application
Unleashed	I-Application
also	O
features	O
hub	O
worlds	O
,	O
in	O
which	O
the	O
player	O
may	O
reveal	O
,	O
as	O
well	O
as	O
advance	O
,	O
the	O
story	O
of	O
the	O
game	O
.	O
</s>
<s>
Hubworlds	O
operate	O
differently	O
depending	O
on	O
the	O
version	O
of	O
the	O
game	O
being	O
played	O
;	O
the	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
versions	O
feature	O
fully	O
interactive	O
,	O
explorable	O
3D	O
hub	O
worlds	O
,	O
similar	O
to	O
those	O
in	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
and	O
Sonic	B-Application
Adventure	I-Application
,	O
in	O
which	O
townspeople	O
may	O
be	O
interacted	O
with	O
and	O
side	O
quests	O
may	O
be	O
undertaken	O
,	O
in	O
order	O
to	O
gain	O
experience	O
or	O
unlock	O
items	O
,	O
such	O
as	O
artwork	O
,	O
videos	O
and	O
music	O
tracks	O
.	O
</s>
<s>
In	O
contrast	O
,	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
versions	O
feature	O
menu-based	O
map	O
systems	O
,	O
in	O
which	O
players	O
simply	O
click	O
on	O
areas	O
to	O
talk	O
to	O
townspeople	O
and	O
find	O
information	O
.	O
</s>
<s>
Within	O
both	O
day	O
and	O
night-time	O
levels	O
are	O
medals	O
that	O
Sonic	B-Application
may	O
collect	O
,	O
two	O
types	O
of	O
which	O
exist	O
:	O
Sun	O
and	O
Moon	O
.	O
</s>
<s>
In	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
versions	O
,	O
collecting	O
these	O
medals	O
allows	O
the	O
player	O
to	O
level	O
up	O
Sonic	B-Application
's	O
Sun	O
and	O
Moon	O
stats	O
,	O
and	O
these	O
must	O
be	O
increased	O
to	O
reach	O
new	O
stages	O
in	O
the	O
game	O
,	O
with	O
a	O
certain	O
number	O
of	O
Sun	O
Medals	O
for	O
Hedgehog	O
levels	O
,	O
and	O
a	O
certain	O
number	O
of	O
Moon	O
Medals	O
for	O
Werehog	B-Application
levels	O
.	O
</s>
<s>
Because	O
only	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
versions	O
feature	O
playable	O
hubworlds	O
,	O
these	O
are	O
also	O
the	O
only	O
versions	O
in	O
which	O
Sun	O
and	O
Moon	O
Medals	O
may	O
be	O
found	O
by	O
exploring	O
the	O
towns	O
,	O
talking	O
to	O
the	O
citizens	O
,	O
and	O
completing	O
side	O
quests	O
.	O
</s>
<s>
In	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
versions	O
,	O
Sun	O
and	O
Moon	O
Medals	O
are	O
earned	O
after	O
completing	O
stages	O
and	O
clearing	O
their	O
objectives	O
.	O
</s>
<s>
In	O
a	O
cold	O
open	O
,	O
Sonic	B-Application
is	O
pursuing	O
his	O
nemesis	O
,	O
Doctor	O
Eggman	O
,	O
bounding	O
around	O
a	O
fleet	O
of	O
spaceships	O
.	O
</s>
<s>
After	O
the	O
defeat	O
of	O
several	O
of	O
his	O
robots	O
,	O
Sonic	B-Application
transforms	O
into	O
Super	O
Sonic	B-Application
and	O
corners	O
Eggman	O
on	O
the	O
main	O
spaceship	O
.	O
</s>
<s>
However	O
,	O
Eggman	O
traps	O
the	O
hedgehog	O
using	O
the	O
energy	O
field	O
of	O
a	O
powerful	O
new	O
ray	O
weapon	O
called	O
the	O
Chaos	O
Energy	O
Cannon	O
,	O
which	O
robs	O
him	O
of	O
his	O
Super	O
Sonic	B-Application
power	O
and	O
removes	O
the	O
Chaos	O
Emeralds	O
out	O
of	O
him	O
as	O
well	O
as	O
their	O
power	O
,	O
causing	O
them	O
to	O
turn	O
grey	O
and	O
useless	O
.	O
</s>
<s>
He	O
then	O
uses	O
the	O
Emeralds	O
 '	O
energy	O
to	O
fire	O
an	O
enormous	O
laser	O
and	O
unleash	O
a	O
powerful	O
beast	O
,	O
Dark	B-Application
Gaia	I-Application
,	O
from	O
the	O
center	O
of	O
the	O
planet	O
,	O
which	O
has	O
devastating	O
consequences	O
,	O
shattering	O
the	O
planet	O
into	O
seven	O
pieces	O
.	O
</s>
<s>
In	O
addition	O
,	O
the	O
process	O
has	O
the	O
unforeseen	O
side-effect	O
of	O
transforming	O
Sonic	B-Application
into	O
a	O
"	O
Werehog	B-Application
"	O
—	O
a	O
beast	O
form	O
that	O
loses	O
speed	O
but	O
gains	O
greater	O
strength	O
and	O
abilities	O
—	O
at	O
night	O
.	O
</s>
<s>
Eggman	O
ejects	O
Sonic	B-Application
into	O
space	O
,	O
who	O
then	O
lands	O
safely	O
onto	O
the	O
planet	O
below	O
thanks	O
to	O
a	O
strange	O
green	O
shield	O
.	O
</s>
<s>
After	O
landing	O
along	O
with	O
the	O
Emeralds	O
,	O
Sonic	B-Application
encounters	O
a	O
friendly	O
creature	O
who	O
appears	O
to	O
suffer	O
amnesia	B-Application
.	O
</s>
<s>
Assuming	O
he	O
has	O
caused	O
it	O
with	O
his	O
fall	O
,	O
Sonic	B-Application
decides	O
to	O
assist	O
him	O
in	O
his	O
quest	O
to	O
find	O
out	O
who	O
he	O
is	O
,	O
and	O
the	O
creature	O
becomes	O
a	O
guide	O
for	O
Sonic	B-Application
;	O
he	O
then	O
gives	O
him	O
the	O
nickname	O
"	O
Chip	B-Application
"	O
.	O
</s>
<s>
Sonic	B-Application
's	O
quest	O
begins	O
,	O
and	O
with	O
the	O
help	O
of	O
some	O
old	O
friends	O
,	O
such	O
as	O
Amy	O
and	O
Tails	O
,	O
he	O
attempts	O
to	O
solve	O
the	O
crisis	O
by	O
traveling	O
the	O
world	O
's	O
continents	O
,	O
finding	O
Gaia	O
Temples	O
that	O
will	O
restore	O
the	O
Emeralds	O
 '	O
power	O
,	O
in	O
order	O
to	O
return	O
the	O
world	O
,	O
and	O
himself	O
,	O
to	O
normal	O
.	O
</s>
<s>
After	O
six	O
out	O
of	O
the	O
seven	O
continents	O
are	O
returned	O
to	O
normal	O
,	O
Chip	B-Application
is	O
able	O
to	O
regain	O
his	O
memory	O
;	O
he	O
is	O
in	O
fact	O
Dark	B-Application
Gaia	I-Application
's	O
opposite	O
,	O
Light	B-Application
Gaia	I-Application
.	O
</s>
<s>
Since	O
the	O
beginning	O
of	O
time	O
,	O
the	O
two	O
of	O
them	O
had	O
been	O
in	O
a	O
cycle	O
where	O
Dark	B-Application
Gaia	I-Application
would	O
break	O
the	O
planet	O
apart	O
,	O
and	O
Light	B-Application
Gaia	I-Application
would	O
put	O
it	O
back	O
together	O
.	O
</s>
<s>
Chip	B-Application
was	O
released	O
along	O
with	O
Dark	B-Application
Gaia	I-Application
,	O
but	O
because	O
both	O
of	O
them	O
were	O
released	O
prematurely	O
,	O
he	O
lost	O
his	O
memory	O
,	O
and	O
Dark	B-Application
Gaia	I-Application
was	O
broken	O
apart	O
.	O
</s>
<s>
They	O
are	O
able	O
to	O
place	O
the	O
last	O
Chaos	O
Emerald	O
in	O
the	O
shrine	O
on	O
the	O
final	O
continent	O
at	O
Eggman	O
's	O
new	O
empire	O
,	O
"	O
Eggmanland	O
"	O
,	O
but	O
are	O
interrupted	O
by	O
him	O
;	O
Sonic	B-Application
then	O
defeats	O
Eggman	O
who	O
is	O
using	O
a	O
robot	O
that	O
utilizes	O
Dark	B-Application
Gaia	I-Application
's	O
power	O
,	O
the	O
Egg	O
Dragoon	O
.	O
</s>
<s>
During	O
the	O
battle	O
,	O
the	O
three	O
sink	O
into	O
the	O
core	O
of	O
the	O
Earth	O
and	O
encounter	O
Dark	B-Application
Gaia	I-Application
.	O
</s>
<s>
Eggman	O
orders	O
Dark	B-Application
Gaia	I-Application
to	O
destroy	O
Sonic	B-Application
,	O
but	O
it	O
turns	O
on	O
him	O
,	O
knocking	O
him	O
away	O
with	O
one	O
of	O
its	O
tentacles	O
,	O
and	O
absorbs	O
the	O
power	O
that	O
turned	O
Sonic	B-Application
into	O
a	O
Werehog	B-Application
,	O
curing	O
Sonic	B-Application
of	O
lycanthropy	O
.	O
</s>
<s>
Dark	B-Application
Gaia	I-Application
then	O
attacks	O
Sonic	B-Application
and	O
Chip	B-Application
,	O
but	O
Chip	B-Application
protects	O
Sonic	B-Application
and	O
calls	O
all	O
of	O
the	O
Gaia	O
temples	O
together	O
to	O
form	O
the	O
Light	B-Application
Gaia	I-Application
Colossus	O
and	O
fight	O
Dark	B-Application
Gaia	I-Application
.	O
</s>
<s>
The	O
Gaia	B-Application
Colossus	I-Application
seemingly	O
destroys	O
Dark	B-Application
Gaia	I-Application
,	O
but	O
Dark	B-Application
Gaia	I-Application
is	O
not	O
finished	O
with	O
them	O
or	O
the	O
Earth	O
yet	O
,	O
and	O
consumes	O
the	O
entire	O
world	O
in	O
darkness	O
,	O
becoming	O
Perfect	O
Dark	B-Application
Gaia	I-Application
in	O
the	O
process	O
.	O
</s>
<s>
Chip	B-Application
then	O
gives	O
the	O
restored	O
Chaos	O
Emeralds	O
to	O
Sonic	B-Application
,	O
allowing	O
him	O
to	O
turn	O
into	O
Super	O
Sonic	B-Application
and	O
continue	O
their	O
fight	O
,	O
until	O
he	O
finally	O
destroys	O
it	O
;	O
Dark	B-Application
Gaia	I-Application
sinks	O
back	O
into	O
the	O
planet	O
,	O
but	O
the	O
battle	O
takes	O
its	O
toll	O
on	O
Super	O
Sonic	B-Application
.	O
</s>
<s>
Chip	B-Application
saves	O
Sonic	B-Application
by	O
throwing	O
him	O
to	O
the	O
surface	O
,	O
before	O
returning	O
himself	O
to	O
the	O
inside	O
of	O
the	O
planet	O
;	O
he	O
leaves	O
behind	O
his	O
necklace	O
and	O
some	O
parting	O
words	O
.	O
</s>
<s>
Sonic	B-Application
places	O
the	O
necklace	O
on	O
his	O
hand	O
as	O
a	O
bracelet	O
to	O
remind	O
him	O
of	O
their	O
adventure	O
together	O
before	O
speeding	O
off	O
with	O
Tails	O
,	O
flying	O
alongside	O
him	O
on	O
the	O
coastline	O
in	O
the	O
Tornado	O
plane	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
began	O
development	O
of	O
the	O
game	O
in	O
2006	O
,	O
after	O
having	O
begun	O
work	O
on	O
the	O
core	O
technology	O
,	O
the	O
Hedgehog	O
Engine	O
,	O
in	O
2005	O
.	O
</s>
<s>
The	O
title	O
Sonic	B-Application
Unleashed	I-Application
was	O
trademarked	O
by	O
Sega	O
on	O
March	O
12	O
,	O
2008	O
.	O
</s>
<s>
The	O
game	O
was	O
developed	O
internally	O
by	O
Sonic	B-Application
Team	O
in	O
Japan	O
.	O
</s>
<s>
It	O
was	O
originally	O
intended	O
to	O
be	O
the	O
third	O
installment	O
of	O
the	O
Sonic	B-Application
Adventure	I-Application
series	O
and	O
subsequently	O
,	O
at	O
an	O
early	O
development	O
stage	O
,	O
had	O
the	O
working	O
title	O
Sonic	B-Application
World	I-Application
Adventure	I-Application
,	O
complete	O
with	O
a	O
work-in-progress	O
logo	O
.	O
</s>
<s>
However	O
,	O
the	O
development	O
team	O
began	O
to	O
introduce	O
enough	O
new	O
innovations	O
to	O
separate	O
it	O
from	O
the	O
Sonic	B-Application
Adventure	I-Application
games	O
,	O
and	O
so	O
a	O
new	O
title	O
,	O
Sonic	B-Application
Unleashed	I-Application
,	O
was	O
decided	O
.	O
</s>
<s>
It	O
was	O
then	O
later	O
revealed	O
that	O
the	O
game	O
's	O
name	O
in	O
Japan	O
would	O
in	O
fact	O
remain	O
Sonic	B-Application
World	I-Application
Adventure	I-Application
for	O
its	O
release	O
there	O
.	O
</s>
<s>
Sonic	B-Application
Team	O
decided	O
early	O
on	O
in	O
the	O
development	O
process	O
to	O
reduce	O
the	O
number	O
of	O
characters	O
present	O
in	O
the	O
game	O
,	O
as	O
well	O
as	O
to	O
make	O
Sonic	B-Application
the	O
only	O
playable	O
character	O
;	O
this	O
decision	O
was	O
taken	O
to	O
get	O
more	O
quality	O
out	O
of	O
fewer	O
characters	O
.	O
</s>
<s>
While	O
it	O
felt	O
that	O
these	O
ideas	O
combined	O
with	O
traditional	O
Sonic	B-Application
gameplay	O
was	O
a	O
good	O
beginning	O
,	O
it	O
also	O
had	O
to	O
consider	O
how	O
to	O
introduce	O
newer	O
gamers	O
unfamiliar	O
with	O
the	O
Sonic	B-Application
franchise	I-Application
to	O
the	O
series	O
,	O
and	O
so	O
the	O
concept	O
of	O
the	O
Werehog	B-Application
was	O
born	O
,	O
in	O
addition	O
to	O
exploring	O
its	O
own	O
mythology	O
and	O
ideas	O
for	O
the	O
story	O
.	O
</s>
<s>
Director	O
Yoshihisa	O
Hashimoto	O
felt	O
from	O
the	O
outset	O
that	O
there	O
would	O
be	O
both	O
praise	O
and	O
criticism	O
,	O
but	O
hoped	O
that	O
long-term	O
Sonic	B-Application
fans	O
would	O
understand	O
and	O
empathise	O
with	O
the	O
ideas	O
and	O
direction	O
the	O
team	O
had	O
taken	O
.	O
</s>
<s>
In	O
terms	O
of	O
technology	O
,	O
Hashimoto	O
remarked	O
that	O
the	O
visual	O
style	O
was	O
born	O
out	O
of	O
desire	O
to	O
see	O
a	O
global	B-Algorithm
illumination	I-Algorithm
solution	O
used	O
for	O
the	O
game	O
's	O
lighting	O
—	O
that	O
is	O
,	O
light	O
reflecting	O
from	O
one	O
object	O
in	O
the	O
scene	O
onto	O
others	O
.	O
</s>
<s>
To	O
this	O
extent	O
,	O
development	O
on	O
the	O
renderer	O
for	O
this	O
process	O
began	O
,	O
and	O
the	O
final	O
solution	O
allowed	O
the	O
developers	O
to	O
use	O
distributed	B-Operating_System
rendering	I-Operating_System
over	O
hundreds	O
of	O
computers	O
to	O
calculate	O
lighting	O
for	O
each	O
ten	O
-	O
to	O
twenty-kilometer	O
action	O
stage	O
in	O
around	O
two	O
or	O
three	O
days	O
.	O
</s>
<s>
Characters	O
,	O
enemies	O
and	O
objects	O
are	O
then	O
lit	O
at	O
run-time	O
with	O
Sonic	B-Application
Team	O
's	O
"	O
Light	O
Field	O
"	O
technology	O
to	O
blend	O
them	O
in	O
with	O
the	O
surrounding	O
pre-calculated	O
lighting	O
.	O
</s>
<s>
Because	O
the	O
game	O
was	O
being	O
developed	O
for	O
two	O
levels	O
of	O
hardware	O
capability	O
depending	O
on	O
the	O
target	O
platform	O
,	O
two	O
development	O
"	O
silos	O
"	O
were	O
set	O
up	O
to	O
work	O
on	O
two	O
separate	O
builds	O
of	O
the	O
game	O
:	O
one	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
version	O
utilizing	O
the	O
Hedgehog	O
Engine	O
,	O
and	O
one	O
for	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
version	O
,	O
which	O
instead	O
utilizes	O
a	O
modified	O
version	O
of	O
an	O
existing	O
,	O
internal	O
Sega	O
engine	O
.	O
</s>
<s>
Hashimoto	O
,	O
who	O
had	O
never	O
directed	O
a	O
Sonic	B-Application
game	O
before	O
,	O
incorporated	O
new	O
features	O
such	O
as	O
a	O
"	O
Quick	O
Step	O
"	O
mechanic	O
allowing	O
players	O
to	O
dodge	O
obstacles	O
with	O
the	O
L	O
and	O
R	O
triggers	O
.	O
</s>
<s>
Hashimoto	O
sought	O
to	O
combine	O
the	O
best	O
qualities	O
of	O
2D	O
and	O
3D	O
Sonic	B-Application
gameplay	O
and	O
address	O
the	O
criticisms	O
directed	O
at	O
previous	O
3D	O
entries	O
in	O
the	O
franchise	O
.	O
</s>
<s>
As	O
well	O
as	O
the	O
unique	O
motion-based	O
gameplay	O
mechanics	O
,	O
the	B-Operating_System
Wii	I-Operating_System
version	O
of	O
the	O
game	O
also	O
supports	O
the	O
GameCube	B-Device
controller	I-Device
,	O
and	O
also	O
the	O
option	O
of	O
using	O
the	O
Classic	B-Device
Controller	I-Device
.	O
</s>
<s>
The	O
daytime	O
levels	O
for	O
the	B-Operating_System
Wii	I-Operating_System
were	O
altered	O
to	O
accommodate	O
the	O
motion	O
control-based	O
boost	O
mechanic	O
,	O
while	O
night-time	O
levels	O
include	O
a	O
mostly	O
behind-the-back	O
view	O
and	O
different	O
platforming	O
styles	O
and	O
combat	O
mechanics	O
.	O
</s>
<s>
Developer	O
Dimps	O
,	O
who	O
had	O
past	O
involvement	O
in	O
the	O
Sonic	B-Application
franchise	I-Application
,	O
was	O
involved	O
in	O
the	O
design	O
of	O
the	O
daytime	O
areas	O
for	O
these	O
versions	O
.	O
</s>
<s>
In	O
addition	O
,	O
overall	O
,	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
versions	O
have	O
fewer	O
daytime	O
levels	O
than	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
counterparts	O
.	O
</s>
<s>
Sonic	B-Application
Unleashed	I-Application
was	O
released	O
for	O
PlayStation	B-Device
2	I-Device
,	O
Wii	B-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
on	O
November	O
18	O
,	O
2008	O
,	O
in	O
North	O
America	O
,	O
and	O
on	O
November	O
27	O
and	O
November	O
28	O
,	O
2008	O
,	O
in	O
Australia	O
and	O
Europe	O
,	O
respectively	O
.	O
</s>
<s>
The	O
PlayStation	B-Operating_System
3	I-Operating_System
version	O
was	O
released	O
a	O
month	O
later	O
on	O
December	O
9	O
in	O
North	O
America	O
,	O
on	O
December	O
18	O
in	O
Australia	O
,	O
and	O
on	O
December	O
19	O
in	O
Europe	O
.	O
</s>
<s>
In	O
Japan	O
the	B-Operating_System
Wii	I-Operating_System
version	O
was	O
released	O
on	O
December	O
18	O
,	O
2008	O
,	O
with	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
versions	O
releasing	O
next	O
year	O
,	O
on	O
February	O
19	O
,	O
2009	O
.	O
</s>
<s>
A	O
demo	O
version	O
was	O
released	O
on	O
the	O
Xbox	B-Operating_System
Live	O
Marketplace	O
on	O
December	O
8	O
,	O
2008	O
and	O
on	O
the	O
US	O
and	O
EU	O
PlayStation	B-Device
Stores	O
on	O
December	O
18	O
and	O
24	O
,	O
2008	O
,	O
respectively	O
.	O
</s>
<s>
The	O
demo	O
does	O
not	O
contain	O
any	O
of	O
the	O
Werehog	B-Application
stages	O
.	O
</s>
<s>
On	O
March	O
12	O
,	O
2009	O
,	O
Sega	O
released	O
Sonic	B-Application
Unleasheds	I-Application
first	O
downloadable	O
content	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
consisting	O
of	O
four	O
Chun-nan	O
daytime	O
stages	O
and	O
two	O
night	O
stages	O
in	O
addition	O
to	O
two	O
new	O
missions	O
.	O
</s>
<s>
Speaking	O
after	O
the	O
game	O
's	O
release	O
,	O
Sonic	B-Application
Team	O
member	O
and	O
Sonic	B-Application
and	I-Application
the	I-Application
Black	I-Application
Knight	I-Application
producer	O
and	O
director	O
Tetsu	O
Katano	O
remarked	O
that	O
although	O
he	O
did	O
not	O
feel	O
the	O
Werehog	B-Application
concept	O
was	O
a	O
mistake	O
,	O
time	O
and	O
resources	O
were	O
a	O
limiting	O
factor	O
in	O
the	O
game	O
's	O
production	O
.	O
</s>
<s>
He	O
also	O
remarked	O
that	O
the	O
Werehog	B-Application
may	O
reappear	O
in	O
future	O
games	O
,	O
or	O
possibly	O
in	O
a	O
sequel	O
to	O
Sonic	B-Application
Unleashed	I-Application
,	O
should	O
one	O
be	O
made	O
.	O
</s>
<s>
Game	O
developer	O
Gameloft	O
announced	O
in	O
May	O
2009	O
that	O
it	O
had	O
secured	O
a	O
licensing	O
agreement	O
with	O
Sega	O
Europe	O
Ltd	O
.	O
to	O
produce	O
Java	O
versions	O
of	O
Sega	O
properties	O
,	O
and	O
that	O
its	O
first	O
game	O
would	O
be	O
a	O
version	O
of	O
Sonic	B-Application
Unleashed	I-Application
for	O
mobile	O
phone	O
platforms	O
.	O
</s>
<s>
The	O
mobile	O
version	O
of	O
Sonic	B-Application
Unleashed	I-Application
is	O
strictly	O
a	O
side-scroller	O
reminiscent	O
of	O
the	O
original	O
Genesis	O
games	O
,	O
featuring	O
new	O
level	O
designs	O
and	O
character	O
abilities	O
.	O
</s>
<s>
The	O
game	O
's	O
soundtrack	O
,	O
Planetary	O
Pieces	O
:	O
Sonic	B-Application
World	I-Application
Adventure	I-Application
Original	O
Soundtrack	O
,	O
was	O
released	O
as	O
a	O
three-disc	O
set	O
in	O
Japan	O
on	O
January	O
28	O
,	O
2009	O
.	O
</s>
<s>
The	O
vocal	O
theme	O
track	O
,	O
"	O
Endless	O
Possibility	O
"	O
written	O
by	O
longtime	O
Sonic	B-Application
game	O
composer	O
,	O
Tomoya	O
Ohtani	O
,	O
features	O
Jaret	O
Reddick	O
of	O
the	O
American	O
rock	O
band	O
Bowling	O
for	O
Soup	O
.	O
</s>
<s>
Initial	O
anticipation	O
when	O
the	O
first	O
media	O
for	O
Unleashed	O
was	O
revealed	O
was	O
high	O
,	O
as	O
the	O
demonstration	O
videos	O
hinted	O
at	O
a	O
possible	O
return	O
of	O
Sonic	B-Application
to	O
his	O
traditional	O
platforming	O
roots	O
,	O
especially	O
because	O
of	O
the	O
series	O
 '	O
declining	O
quality	O
in	O
recent	O
years	O
,	O
and	O
a	O
number	O
of	O
poorly	O
received	O
games	O
in	O
the	O
franchise	O
that	O
preceded	O
it	O
,	O
such	O
as	O
the	O
2006	O
game	O
,	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
.	O
</s>
<s>
Critical	O
reception	O
to	O
Unleashed	O
was	O
mixed	O
,	O
with	O
Metacritic	O
aggregate	O
scores	O
of	O
60	O
and	O
54	O
out	O
of	O
100	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
versions	O
respectively	O
,	O
and	O
66	O
out	O
of	O
100	O
for	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
versions	O
.	O
</s>
<s>
The	O
added	O
element	O
of	O
motion	O
controls	O
for	O
the	O
Werehog	B-Application
sections	O
,	O
as	O
well	O
as	O
text-based	O
hub	O
worlds	O
and	O
better	O
Werehog	B-Application
level	O
design	O
and	O
camera	O
system	O
,	O
were	O
reasons	O
cited	O
for	O
the	O
higher	O
review	O
scores	O
for	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
versions	O
of	O
the	O
game	O
,	O
though	O
a	O
few	O
review	O
websites	O
,	O
such	O
as	O
1UP	O
,	O
gave	O
the	B-Operating_System
Wii	I-Operating_System
version	O
a	O
lower	O
score	O
than	O
its	O
Xbox	B-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
counterparts	O
.	O
</s>
<s>
Positive	O
elements	O
of	O
Sonic	B-Application
Unleashed	I-Application
remarked	O
upon	O
by	O
reviews	O
include	O
the	O
environments	O
,	O
such	O
as	O
the	O
"	O
postcard-perfect	O
architecture	O
"	O
,	O
and	O
the	O
graphics	O
,	O
with	O
stages	O
looking	O
"	O
absolutely	O
gorgeous	O
"	O
and	O
being	O
"	O
very	O
pretty	O
and	O
lovingly	O
animated	O
"	O
,	O
with	O
one	O
reviewer	O
comparing	O
them	O
to	O
a	O
playable	O
Pixar	O
film	O
.	O
</s>
<s>
Praise	O
was	O
given	O
to	O
the	O
technical	O
competence	O
of	O
Sega	O
's	O
new	O
Hedgehog	O
Engine	O
as	O
a	O
whole	O
on	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
versions	O
,	O
with	O
"	O
bright	O
cartoonish	O
graphics	O
that	O
fly	O
by	O
without	O
a	O
stutter	O
"	O
;	O
however	O
,	O
some	O
complaints	O
were	O
raised	O
about	O
frame	O
rate	O
reduction	O
when	O
large	O
numbers	O
of	O
enemies	O
appeared	O
during	O
the	O
Werehog	B-Application
sections	O
.	O
</s>
<s>
Although	O
the	B-Operating_System
Wii	I-Operating_System
and	O
PlayStation	B-Device
2	I-Device
versions	O
do	O
not	O
use	O
the	O
Hedgehog	O
Engine	O
,	O
graphics	O
for	O
these	O
platforms	O
were	O
still	O
praised	O
for	O
their	O
high	O
quality	O
,	O
with	O
the	O
game	O
being	O
nominated	O
for	O
Best	O
Graphics	O
Technology	O
for	O
the	B-Operating_System
Wii	I-Operating_System
by	O
IGN	O
in	O
its	O
2008	O
video	O
game	O
awards	O
.	O
</s>
<s>
A	O
generally	O
negative	O
reaction	O
was	O
given	O
by	O
critics	O
to	O
the	O
Werehog	B-Application
concept	O
and	O
corresponding	O
night-time	O
sections	O
,	O
which	O
contributed	O
greatly	O
to	O
the	O
lower	O
than	O
expected	O
review	O
scores	O
.	O
</s>
<s>
Some	O
reviewers	O
compared	O
the	O
Werehog	B-Application
sections	O
to	O
God	B-Application
of	I-Application
War	I-Application
.	O
</s>
<s>
Some	O
reviewers	O
felt	O
that	O
the	O
Werehog	B-Application
as	O
a	O
concept	O
did	O
not	O
mix	O
well	O
with	O
the	O
daylight	O
areas	O
and	O
traditional	O
Sonic	B-Application
gameplay	O
;	O
GamePros	O
review	O
described	O
them	O
as	O
"	O
dreadfully	O
out-of-place	O
"	O
,	O
while	O
IGN	O
stated	O
that	O
they	O
have	O
"	O
nothing	O
to	O
do	O
with	O
Sonic	B-Application
whatsoever	O
"	O
,	O
feeling	O
that	O
the	O
Werehog	B-Application
was	O
"	O
being	O
slapped	O
on	O
"	O
to	O
the	O
Sonic	B-Application
experience	O
.	O
</s>
<s>
In	O
stark	O
contrast	O
to	O
the	O
Werehog	B-Application
sections	O
,	O
many	O
reviewers	O
found	O
the	O
daytime	O
levels	O
to	O
be	O
enjoyable	O
,	O
especially	O
the	O
"	O
exhilarating	O
"	O
sense	O
of	O
speed	O
they	O
provide	O
;	O
with	O
"	O
the	O
most	O
satisfying	O
gameplay	O
of	O
any	O
Sonic	B-Application
title	O
in	O
years	O
"	O
,	O
the	O
game	O
"	O
perfectly	O
 [ captures ] 	O
the	O
feel	O
of	O
classic	O
Sonic	B-Application
"	O
.	O
</s>
<s>
GameSpot	O
's	O
review	O
for	O
the	B-Operating_System
Xbox	I-Operating_System
360	I-Operating_System
version	O
,	O
however	O
,	O
argued	O
that	O
the	O
controls	O
were	O
"	O
unresponsive	O
"	O
in	O
the	O
daytime	O
levels	O
,	O
and	O
that	O
most	O
of	O
them	O
were	O
"	O
horribly	O
designed	O
"	O
,	O
instead	O
describing	O
the	B-Operating_System
Wii	I-Operating_System
version	O
as	O
a	O
"	O
vastly	O
superior	O
experience	O
"	O
,	O
with	O
its	O
daytime	O
levels	O
praised	O
for	O
better	O
control	O
and	O
design	O
.	O
</s>
<s>
Aside	O
from	O
the	O
criticism	O
of	O
Werehog	B-Application
levels	O
,	O
further	O
aspects	O
of	O
the	O
game	O
were	O
criticised	O
,	O
contributing	O
to	O
the	O
mixed	O
review	O
scores	O
.	O
</s>
<s>
The	O
story	O
and	O
overall	O
tone	O
of	O
the	O
game	O
,	O
including	O
the	O
new	O
character	O
Chip	B-Application
,	O
were	O
criticised	O
,	O
some	O
remarking	O
that	O
it	O
was	O
too	O
juvenile	O
,	O
or	O
comparable	O
to	O
that	O
of	O
a	O
Saturday	O
morning	O
cartoon	O
.	O
</s>
<s>
Archie	O
Comics	O
published	O
an	O
adaptation	O
of	O
Sonic	B-Application
Unleashed	I-Application
featuring	O
the	O
opening	O
cutscene	O
and	O
Sonic	B-Application
's	O
transformation	O
into	O
the	O
Werehog	B-Application
.	O
</s>
<s>
A	O
short	O
CGI	O
animated	O
film	O
was	O
released	O
to	O
tie	O
in	O
with	O
the	O
game	O
on	O
November	O
17	O
,	O
2008	O
,	O
Sonic	B-Application
:	O
Night	O
of	O
the	O
Werehog	B-Application
.	O
</s>
<s>
Sonic	B-Application
Unleasheds	I-Application
engine	O
,	O
the	O
Hedgehog	O
Engine	O
,	O
would	O
later	O
be	O
refined	O
for	O
use	O
with	O
later	O
games	O
in	O
the	O
franchise	O
,	O
such	O
as	O
Sonic	B-Application
Generations	I-Application
(	O
2011	O
)	O
and	O
Sonic	B-Application
Forces	I-Application
(	O
2017	O
)	O
.	O
</s>
<s>
To	O
celebrate	O
the	O
Sonic	B-Application
franchise	I-Application
's	O
20th	O
anniversary	O
,	O
Sega	O
released	O
Sonic	B-Application
Generations	I-Application
,	O
which	O
re-made	O
various	O
stages	O
and	O
aspects	O
from	O
throughout	O
the	O
series	O
.	O
</s>
<s>
The	O
console/PC	O
versions	O
of	O
the	O
game	O
contain	O
remakes	O
of	O
the	O
"	O
Rooftop	B-Application
Run	I-Application
"	O
stage	O
and	O
the	O
Egg	O
Dragoon	O
boss	O
fight	O
.	O
</s>
<s>
The	O
2017	O
entry	O
Sonic	B-Application
Forces	I-Application
also	O
contains	O
a	O
re-imagined	O
version	O
of	O
the	O
Egg	O
Dragoon	O
boss	O
.	O
</s>
