<s>
Cartoon	B-Application
Network	I-Application
Universe	I-Application
:	I-Application
FusionFall	I-Application
was	O
a	O
massively	B-Application
multiplayer	I-Application
online	I-Application
game	I-Application
developed	O
by	O
Cartoon	O
Network	O
and	O
South	O
Korean	O
studio	O
Grigon	O
Entertainment	O
and	O
released	O
on	O
January	O
14	O
,	O
2009	O
.	O
</s>
<s>
FusionFall	B-Application
used	O
the	O
Unity	B-Application
engine	I-Application
as	O
its	O
client	O
technology	O
basis	O
.	O
</s>
<s>
It	O
was	O
unofficially	O
revived	O
by	O
fans	O
as	O
two	O
different	O
games	O
in	O
2017	O
,	O
the	O
first	O
being	O
FusionFall	B-Application
:	O
Retro	O
which	O
was	O
the	O
original	O
game	O
and	O
the	O
second	O
being	O
FusionFall	B-Application
:	O
Legacy	O
which	O
was	O
planned	O
to	O
be	O
the	O
original	O
game	O
but	O
with	O
additional	O
content	O
.	O
</s>
<s>
In	O
FusionFall	B-Application
,	O
the	O
player	O
takes	O
control	O
of	O
a	O
customized	O
character	O
.	O
</s>
<s>
A	O
special	O
feature	O
present	O
in	O
FusionFall	B-Application
is	O
the	O
use	O
of	O
nanos	O
,	O
representing	O
small	O
avatars	O
that	O
provide	O
abilities	O
for	O
a	O
short	O
time	O
.	O
</s>
<s>
On	O
certain	O
holidays	O
,	O
such	O
as	O
Thanksgiving	O
or	O
Christmas	O
,	O
FusionFall	B-Application
had	O
small	O
in-game	O
celebrations	O
that	O
usually	O
involved	O
a	O
special	O
code	O
for	O
exclusive	O
holiday	O
items	O
,	O
scenery	O
,	O
and	O
missions	O
carried	O
by	O
special	O
guest	O
appearances	O
of	O
future	O
cast	O
members	O
.	O
</s>
<s>
FusionFall'''s	O
development	O
,	O
however	O
,	O
stopped	O
so	O
Cartoon	O
Network	O
could	O
focus	O
on	O
other	O
games	O
such	O
as	O
Project	O
Exonaut	O
,	O
Formula	O
Cartoon	O
,	O
and	O
FusionFall	B-Application
Heroes	O
.	O
</s>
<s>
Unity	B-Application
was	O
decided	O
to	O
be	O
the	O
engine	O
running	O
the	O
game	O
,	O
as	O
the	O
team	O
wanted	O
for	O
people	O
to	O
play	O
even	O
on	O
low-end	O
computers	O
.	O
</s>
<s>
A	O
comic	O
prequel	O
,	O
co-written	O
by	O
Matthew	O
Schwartz	O
and	O
Megas	O
XLR	O
co-creator	O
George	O
Krstic	O
,	O
entitled	O
FusionFall	B-Application
:	O
Worlds	O
Collide	O
!	O
</s>
<s>
All	O
characters	O
created	O
before	O
December	O
22	O
,	O
2008	O
,	O
including	O
those	O
of	O
the	O
FusionFall	B-Application
staff	O
,	O
were	O
deleted	O
,	O
but	O
all	O
made	O
on	O
or	O
after	O
December	O
27	O
,	O
2008	O
,	O
were	O
carried	O
onto	O
the	O
official	O
release	O
.	O
</s>
<s>
When	O
it	O
was	O
first	O
released	O
,	O
FusionFall	B-Application
required	O
a	O
paid	O
subscription	O
for	O
the	O
full	O
game	O
,	O
with	O
a	O
limited	O
portion	O
of	O
the	O
content	O
available	O
for	O
free	O
.	O
</s>
<s>
The	O
FusionFall	B-Application
Victory	O
Pack	O
Exclusive	O
was	O
made	O
available	O
for	O
purchase	O
when	O
the	O
game	O
was	O
released	O
.	O
</s>
<s>
On	O
March	O
25	O
,	O
2013	O
,	O
about	O
five	O
months	O
before	O
the	O
original	O
game	O
's	O
shutdown	O
,	O
Cartoon	O
Network	O
released	O
a	O
new	O
FusionFall	B-Application
game	O
called	O
FusionFall	B-Application
Heroes	O
.	O
</s>
<s>
Playable	O
characters	O
include	O
Finn	O
the	O
Human	O
,	O
Fionna	O
the	O
Human	O
,	O
and	O
Marceline	O
of	O
Adventure	B-Application
Time	I-Application
,	O
Dexter	O
of	O
Dexter	O
's	O
Laboratory	O
,	O
Mordecai	O
and	O
Rigby	O
of	O
Regular	O
Show	O
,	O
Four	O
Arms	O
and	O
Feedback	O
of	O
Ben	B-Device
10	I-Device
,	O
Gumball	O
Watterson	O
of	O
The	O
Amazing	O
World	O
of	O
Gumball	O
,	O
Mojo	O
Jojo	O
of	O
The	O
Powerpuff	O
Girls''	O
,	O
and	O
Johnny	O
Bravo	O
of	O
his	O
eponymous	O
show	O
.	O
</s>
