<s>
Organ	B-Application
Trail	I-Application
is	O
a	O
"	O
retro	O
zombie	B-Application
survival	O
game	O
"	O
that	O
parodies	O
the	O
educational	O
game	O
series	O
The	B-Application
Oregon	I-Application
Trail	I-Application
.	O
</s>
<s>
It	O
was	O
initially	O
released	O
as	O
a	O
free	O
Adobe	O
Flash-based	O
browser	O
game	O
,	O
and	O
later	O
as	O
a	O
Facebook	B-Application
app	O
.	O
</s>
<s>
The	O
game	O
uses	O
the	O
Unity	B-Application
game	I-Application
engine	I-Application
.	O
</s>
<s>
An	O
expanded	O
version	O
,	O
The	B-Application
Organ	I-Application
Trail	I-Application
:	O
Director	O
's	O
Cut	O
,	O
was	O
released	O
on	O
mobile	O
devices	O
in	O
August	O
2012	O
.	O
</s>
<s>
That	O
same	O
month	O
the	O
Director	O
's	O
Cut	O
was	O
also	O
posted	O
on	O
Steam	B-Application
Greenlight	O
;	O
after	O
receiving	O
enough	O
support	O
,	O
it	O
was	O
released	O
on	O
Steam	B-Application
for	O
Windows	O
,	O
Mac	O
,	O
and	O
Linux	B-Application
on	O
March	O
19	O
,	O
2013	O
.	O
</s>
<s>
Most	O
of	O
the	O
copies	O
were	O
sold	O
on	O
Humble	O
Bundle	O
,	O
Steam	B-Application
and	O
iOS	B-Application
.	O
</s>
<s>
Most	O
profits	O
were	O
made	O
on	O
the	O
Steam	B-Application
and	O
iOS	B-Application
platforms	O
.	O
</s>
<s>
In	O
The	B-Application
Organ	I-Application
Trail	I-Application
,	O
players	O
must	O
cross	O
a	O
post-apocalyptic	O
United	O
States	O
in	O
a	O
car	O
in	O
order	O
to	O
reach	O
a	O
sanctuary	O
free	O
of	O
zombies	B-Application
,	O
called	O
Safe	O
Haven	O
.	O
</s>
<s>
In	O
Complete	O
Edition	O
,	O
the	O
player	O
can	O
unlock	O
different	O
character	O
skins	O
,	O
including	O
Ash	O
from	O
Evil	B-Application
Dead	I-Application
,	O
Ripley	O
from	O
the	O
Alien	O
franchise	O
,	O
George	O
A	O
.	O
Romero	O
and	O
Mad	O
Max	O
.	O
</s>
<s>
There	O
are	O
more	O
references	O
to	O
other	O
games	O
and	O
films	O
,	O
such	O
as	O
Left	O
4	O
Dead	O
,	O
the	O
Resident	B-Application
Evil	I-Application
franchise	O
,	O
E.T.	B-Application
,	O
Night	O
of	O
the	O
Living	O
Dead	O
,	O
Zombieland	O
,	O
Planet	O
Terror	O
,	O
and	O
more	O
.	O
</s>
<s>
Every	O
hour	O
(	O
10	O
–	O
5	O
seconds	O
in	O
game	O
)	O
a	O
special	O
event	O
might	O
happen	O
,	O
such	O
as	O
getting	O
surrounded	O
by	O
zombies	B-Application
,	O
characters	O
experiencing	O
different	O
events	O
in	O
the	O
car	O
(	O
negative	O
and	O
positive	O
)	O
,	O
seeing	O
tombstones	O
in	O
the	O
distance	O
(	O
the	O
player	O
will	O
be	O
given	O
the	O
choice	O
of	O
investigating	O
it	O
or	O
not	O
.	O
</s>
<s>
Investigating	O
it	O
triggers	O
the	O
event	O
of	O
finding	O
supplies	O
near	O
the	O
grave	O
or	O
a	O
zombie	B-Application
emerging	O
from	O
the	O
grave	O
)	O
,	O
negative	O
events	O
to	O
the	O
car	O
(	O
for	O
example	O
,	O
accidentally	O
popping	O
the	O
tire	O
or	O
the	O
muffler	O
breaking	O
)	O
and	O
many	O
more	O
.	O
</s>
<s>
The	O
first	O
,	O
a	O
station	O
wagon	O
,	O
is	O
unlocked	O
by	O
default	O
,	O
the	O
second	O
,	O
a	O
SUV	O
which	O
bears	O
strikingly	O
resemblance	O
to	O
Zombieland	O
,	O
is	O
unlocked	O
when	O
getting	O
to	O
Safe	O
Haven	O
,	O
the	O
third	O
,	O
a	O
sedan	O
which	O
bears	O
strikingly	O
resemblance	O
to	O
the	O
green	O
Jaguar	O
in	O
Shaun	O
of	O
the	O
Dead	O
,	O
is	O
unlocked	O
when	O
completing	O
the	O
game	O
on	O
Suicide	O
difficulty	O
,	O
the	O
fourth	O
,	O
a	O
muscle	O
car	O
,	O
is	O
unlocked	O
when	O
the	O
player	O
unlocks	O
all	O
the	O
skulls	O
in	O
Endless	O
mode	O
and	O
the	O
fifth	O
,	O
a	O
UFO	O
,	O
is	O
unlocked	O
when	O
beating	O
the	O
aliens	O
at	O
Area	B-Application
51	I-Application
.	O
</s>
<s>
Some	O
examples	O
include	O
Indianapolis	O
,	O
Chicago	O
,	O
Los	O
Angeles	O
,	O
Washington	O
,	O
D.C.	O
,	O
Area	B-Application
51	I-Application
,	O
Dallas	O
,	O
and	O
more	O
.	O
</s>
<s>
These	O
areas	O
should	O
generally	O
be	O
avoided	O
,	O
because	O
they	O
will	O
give	O
the	O
player	O
and	O
the	O
group	O
radiation	O
sickness	O
(	O
exceptions	O
include	O
getting	O
the	O
UFO	O
at	O
Area	B-Application
51	I-Application
and	O
more	O
advantages	O
in	O
terms	O
of	O
upgraded	O
)	O
.	O
</s>
<s>
The	O
zombies	B-Application
get	O
more	O
active	O
at	O
night	O
,	O
therefore	O
increasing	O
danger	O
.	O
</s>
<s>
There	O
are	O
4	O
stages	O
of	O
zombie	B-Application
activity	O
:	O
Low	O
,	O
Medium	O
,	O
High	O
and	O
Deadly	O
.	O
</s>
<s>
These	O
can	O
influence	O
the	O
number	O
of	O
zombies	B-Application
in	O
scavenging	O
and	O
scenarios	O
.	O
</s>
<s>
Special	O
zombies	B-Application
exist	O
.	O
</s>
<s>
There	O
is	O
a	O
shambling	O
,	O
melting	O
zombie	B-Application
which	O
leaves	O
radioactive	O
sludge	O
behind	O
and	O
appear	O
only	O
in	O
radiated	O
zones	O
.	O
</s>
<s>
A	O
tall	O
zombie	B-Application
which	O
sprints	O
for	O
the	O
player	O
but	O
is	O
stunned	O
when	O
the	O
player	O
looks	O
at	O
him	O
,	O
is	O
encountered	O
randomly	O
on	O
scavenging	O
missions	O
.	O
</s>
<s>
Another	O
special	O
is	O
a	O
fat	O
zombie	B-Application
which	O
takes	O
2	O
shots	O
to	O
kill	O
,	O
as	O
opposed	O
to	O
normal	O
zombies	B-Application
taking	O
only	O
one	O
,	O
is	O
commonly	O
encountered	O
.	O
</s>
<s>
A	O
half-zombie	O
which	O
crawls	O
at	O
high	O
speed	O
is	O
rarer	O
than	O
the	O
fat	O
ones	O
but	O
still	O
pretty	O
common	O
;	O
they	O
're	O
most	O
commonly	O
encountered	O
at	O
tombstones	O
and	O
take	O
only	O
one	O
shot	O
to	O
kill	O
.	O
</s>
<s>
The	O
normal	O
zombies	B-Application
are	O
most	O
common	O
,	O
walk	O
slowly	O
and	O
take	O
one	O
shot	O
to	O
die	O
.	O
</s>
<s>
The	O
only	O
scenario	O
where	O
the	O
player	O
is	O
not	O
able	O
to	O
select	O
one	O
of	O
the	O
three	O
is	O
when	O
a	O
zombie	B-Application
crawls	O
out	O
of	O
a	O
tombstone	O
;	O
they	O
will	O
automatically	O
be	O
given	O
the	O
rifle	O
.	O
</s>
<s>
The	O
second	O
boss	O
are	O
aliens	O
in	O
UFOs	O
and	O
can	O
be	O
encountered	O
in	O
Area	B-Application
51	I-Application
while	O
scavenging	O
.	O
</s>
<s>
The	O
fourth	O
boss	O
are	O
a	O
horde	O
of	O
zombie	B-Application
deer	O
and	O
will	O
occur	O
randomly	O
while	O
on	O
the	O
road	O
.	O
</s>
<s>
The	B-Application
Organ	I-Application
Trails	I-Application
popularity	O
led	O
its	O
developers	O
to	O
start	O
a	O
Kickstarter	O
to	O
fund	O
a	O
"	O
director	O
's	O
cut	O
"	O
of	O
the	O
game	O
based	O
on	O
fan	O
feedback	O
and	O
suggestions	O
.	O
</s>
<s>
While	O
the	O
original	O
game	O
has	O
been	O
described	O
as	O
a	O
"	O
1:1	O
pure	O
parody	O
"	O
of	O
The	B-Application
Oregon	I-Application
Trail	I-Application
,	O
the	O
developers	O
decided	O
The	O
Director	O
's	O
Cut	O
should	O
stand	O
on	O
its	O
own	O
as	O
a	O
title	O
that	O
pushed	O
beyond	O
the	O
source	O
material	O
.	O
</s>
<s>
It	O
was	O
released	O
for	O
iOS	B-Application
and	O
Android	B-Application
devices	O
on	O
August	O
9	O
,	O
2012	O
.	O
</s>
<s>
It	O
debuted	O
for	O
Linux	B-Application
,	O
Mac	O
,	O
PC	O
and	O
Android	B-Application
via	O
The	O
Humble	O
Bundle	O
.	O
</s>
<s>
The	O
game	O
received	O
"	O
generally	O
favorable	O
reviews	O
"	O
on	O
all	O
platforms	O
except	O
the	O
PC	O
version	O
,	O
which	O
received	O
"	O
average	O
"	O
reviews	O
,	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
