<s>
Frets	B-Application
on	I-Application
Fire	I-Application
(	O
FoF	O
)	O
is	O
a	O
free	B-License
,	O
open-source	B-Application
music	B-Application
video	I-Application
game	I-Application
created	O
by	O
Finnish	O
independent	O
video	O
game	O
developer	O
Unreal	O
Voodoo	O
.	O
</s>
<s>
Players	O
use	O
the	O
keyboard	B-Device
to	O
play	O
along	O
with	O
markers	O
which	O
appear	O
on	O
screen	O
,	O
with	O
the	O
aim	O
to	O
score	O
points	O
,	O
achieve	O
a	O
high	O
point	O
multiplier	O
,	O
and	O
complete	O
a	O
song	O
.	O
</s>
<s>
Frets	B-Application
on	I-Application
Fire	I-Application
was	O
the	O
winner	O
of	O
the	O
Assembly	O
2006	O
game	O
development	O
competition	O
.	O
</s>
<s>
The	O
game	O
is	O
written	O
in	O
the	O
Python	B-Language
programming	I-Language
language	I-Language
,	O
and	O
is	O
licensed	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
,	O
although	O
the	O
game	O
incorporates	O
other	O
free	B-License
and	I-License
open-source	I-License
code	O
under	O
other	O
licenses	B-License
.	O
</s>
<s>
The	O
game	O
's	O
included	O
song	O
files	O
and	O
some	O
internal	O
fonts	O
are	O
proprietary	B-Application
,	O
and	O
their	O
redistribution	O
is	O
not	O
permitted	O
outside	O
of	O
the	O
Frets	B-Application
on	I-Application
Fire	I-Application
executable	O
.	O
</s>
<s>
Frets	B-Application
on	I-Application
Fire	I-Application
is	O
a	O
music	O
playing	O
video	O
game	O
.	O
</s>
<s>
It	O
is	O
playable	O
on	O
Microsoft	B-Application
Windows	I-Application
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
and	O
Linux	B-Application
.	O
</s>
<s>
Frets	B-Application
on	I-Application
Fire	I-Application
can	O
be	O
played	O
by	O
using	O
a	O
keyboard	B-Device
by	O
pressing	O
the	O
fret	O
buttons	O
and	O
pick	O
buttons	O
,	O
although	O
there	O
is	O
support	O
for	O
joysticks	B-Device
,	O
meaning	O
that	O
with	O
the	O
appropriate	O
adapter	O
and/or	O
software	O
,	O
various	O
guitar-type	O
controllers	O
can	O
be	O
used	O
as	O
well	O
.	O
</s>
<s>
Frets	B-Application
on	I-Application
Fire	I-Application
includes	O
a	O
built-in	O
song	O
editor	O
(	O
or	O
"	O
fretting	O
"	O
tool	O
)	O
that	O
allows	O
editing	O
and	O
creation	O
of	O
songs	O
.	O
</s>
<s>
MIDI	O
sequences	O
created	O
in	O
programs	O
such	O
as	O
FL	B-Application
Studio	I-Application
and	O
REAPER	B-Application
can	O
also	O
be	O
used	O
.	O
</s>
<s>
The	O
Frets	B-Application
on	I-Application
Fire	I-Application
Wiki	O
has	O
an	O
extensive	O
resource	O
of	O
custom	O
song	O
frets	O
.	O
</s>
<s>
Frets	B-Application
on	I-Application
Fire	I-Application
also	O
allows	O
users	O
to	O
import	O
songs	O
from	O
other	O
guitar	O
games	O
.	O
</s>
<s>
These	O
include	O
Guitar	B-Application
Hero	I-Application
,	O
Guitar	B-Application
Hero	I-Application
II	I-Application
and	O
Guitar	B-Application
Hero	I-Application
Encore	I-Application
:	I-Application
Rocks	I-Application
the	I-Application
80s	I-Application
.	O
</s>
<s>
While	O
the	O
game	O
contains	O
a	O
keyboard	B-Device
play	O
mode	O
,	O
USB	O
Joysticks	B-Device
can	O
also	O
be	O
used	O
.	O
</s>
<s>
This	O
allows	O
use	O
of	O
regular	O
joysticks	B-Device
and	O
guitar	B-Application
controllers	I-Application
.	O
</s>
<s>
These	O
notes	O
allows	O
the	O
player	O
to	O
press	O
only	O
its	O
fret	O
button	O
to	O
play	O
if	O
the	O
previous	O
note	O
was	O
played	O
correctly	O
,	O
emulating	O
the	O
feature	O
of	O
the	O
Guitar	B-Application
Hero	I-Application
series	I-Application
.	O
</s>
<s>
Frets	B-Application
on	I-Application
Fire	I-Application
lacks	O
the	O
ability	O
to	O
allow	O
players	O
to	O
use	O
the	O
whammy	O
bar	O
,	O
while	O
FoFiX	O
has	O
basic	O
support	O
for	O
modulating	O
the	O
pitch	O
of	O
a	O
track	O
.	O
</s>
<s>
Much	O
like	O
console	O
guitar-style	O
games	O
,	O
Frets	B-Application
on	I-Application
Fire	I-Application
comes	O
with	O
World	O
Charts	O
,	O
an	O
official	O
online	O
high	O
score	O
list	O
.	O
</s>
<s>
One	O
popular	O
version	O
of	O
the	O
game	O
is	O
Frets	B-Application
on	I-Application
Fire	I-Application
X	O
(	O
commonly	O
abbreviated	O
FoFiX	O
)	O
,	O
a	O
fork	B-Application
developed	O
from	O
a	O
series	O
of	O
mods	O
of	O
version	O
1.2.451	O
of	O
Frets	B-Application
on	I-Application
Fire	I-Application
.	O
</s>
<s>
As	O
well	O
as	O
having	O
support	O
for	O
four	O
players	O
,	O
this	O
fork	B-Application
supports	O
custom	O
graphical	O
themes	O
(	O
which	O
enables	O
users	O
to	O
create	O
a	O
Guitar	B-Application
Hero	I-Application
or	O
Rock	B-Application
Band	I-Application
look-alike	O
)	O
,	O
bass	O
and	O
drum	O
tracks	O
and	O
preliminary	O
support	O
for	O
lyrics	O
.	O
</s>
<s>
Currently	O
in	O
development	O
for	O
version	O
4.000	O
is	O
the	O
inclusion	O
of	O
Online-Multiplayer	O
,	O
Video	O
Background	O
Support	O
,	O
and	O
support	O
for	O
both	O
Guitar	B-Application
Hero	I-Application
and	O
Rock	B-Application
Band	I-Application
styles	O
of	O
play	O
.	O
</s>
<s>
Frets	B-Application
on	I-Application
Fire	I-Application
has	O
received	O
generally	O
positive	O
reviews	O
in	O
a	O
variety	O
of	O
publications	O
.	O
</s>
<s>
Because	O
of	O
the	O
cross-platform	B-Operating_System
nature	O
of	O
the	O
game	O
,	O
it	O
has	O
garnered	O
fans	O
from	O
both	O
Linux	B-Application
and	O
Mac	O
.	O
</s>
<s>
The	O
University	O
of	O
Nevada	O
developed	O
a	O
modified	O
version	O
of	O
Frets	B-Application
on	I-Application
Fire	I-Application
called	O
Blind	O
Hero	O
which	O
uses	O
a	O
haptic	B-General_Concept
glove	I-General_Concept
to	O
make	O
this	O
game	O
accessible	O
to	O
players	O
who	O
are	O
visually	O
impaired	O
.	O
</s>
<s>
Frets	B-Application
on	I-Application
Fire	I-Application
became	O
a	O
very	O
popular	O
open-source	B-Application
game	I-Application
;	O
the	O
game	O
was	O
downloaded	O
between	O
2007	O
and	O
May	O
2017	O
alone	O
over	O
SourceForge.net	B-Application
over	O
14	O
million	O
times	O
.	O
</s>
