<s>
Falcon	B-Application
's	I-Application
Eye	I-Application
is	O
a	O
version	O
of	O
the	O
roguelike	O
computer	O
game	O
NetHack	B-Application
which	O
introduces	O
isometric	B-Application
graphics	I-Application
and	O
mouse	B-Device
control	I-Device
.	O
</s>
<s>
Falcon	B-Application
's	I-Application
Eye	I-Application
has	O
been	O
praised	O
for	O
improving	O
NetHack	B-Application
's	O
visuals	O
and	O
audio	O
to	O
an	O
almost	O
commercial	O
level	O
and	O
has	O
been	O
noted	O
by	O
Linux	O
Journal	O
as	O
among	O
the	O
best	O
free	B-Application
games	I-Application
available	O
.	O
</s>
<s>
After	O
development	O
stalled	O
in	O
2001	O
,	O
the	O
game	O
was	O
continued	B-Application
as	O
Vulture	B-Application
's	I-Application
Eye	I-Application
and	O
later	O
Vulture	O
for	O
Nethack	B-Application
.	O
</s>
<s>
The	O
main	O
change	O
of	O
Falcon	B-Application
's	I-Application
Eye	I-Application
over	O
earlier	O
Nethack	B-Application
variants	O
is	O
a	O
massive	O
improved	O
graphical	O
representation	O
:	O
it	O
switched	O
from	O
a	O
text-based	B-Application
80x25	B-Application
terminal	B-Application
representation	O
to	O
a	O
3D	B-Application
isometric	I-Application
perspective	O
graphical	O
representation	O
.	O
</s>
<s>
The	O
objects	O
and	O
enemies	O
in	O
the	O
game	O
are	O
no	O
longer	O
represented	O
by	O
minimalistic	O
ASCII	B-Protocol
characters	I-Protocol
,	O
but	O
now	O
have	O
actual	O
graphical	O
representations	O
.	O
</s>
<s>
Whilst	O
adding	O
some	O
features	O
,	O
such	O
as	O
a	O
path	B-Algorithm
finding	I-Algorithm
tool	O
,	O
Falcon	B-Application
's	I-Application
Eye	I-Application
does	O
n't	O
alter	O
the	O
NetHack	B-Application
gameplay	O
.	O
</s>
<s>
Peltonen	O
says	O
that	O
this	O
was	O
to	O
ensure	O
that	O
future	O
versions	O
remain	O
compatible	O
with	O
future	O
releases	O
of	O
NetHack	B-Application
.	O
</s>
<s>
Falcon	B-Application
's	I-Application
Eye	I-Application
provides	O
a	O
context	O
menu	O
when	O
a	O
creature	O
or	O
item	O
is	O
right-clicked	O
.	O
</s>
<s>
Falcon	B-Application
's	I-Application
Eye	I-Application
was	O
developed	O
by	O
Jaakko	O
Peltonen	O
,	O
a	O
researcher	O
of	O
neural	B-Architecture
networks	I-Architecture
at	O
Helsinki	O
University	O
of	O
Technology	O
,	O
originally	O
as	O
a	O
separate	O
engine	O
,	O
and	O
then	O
grafted	O
onto	O
NetHack	B-Application
.	O
</s>
<s>
NetHack	B-Application
's	O
code	O
assumes	O
little	O
about	O
the	O
user	B-Application
interface	I-Application
,	O
telling	O
which	O
dungeon	O
maps	O
and	O
messages	O
to	O
display	O
,	O
but	O
leaves	O
the	O
implementation	O
details	O
to	O
the	O
interface	O
.	O
</s>
<s>
Peltonen	O
explains	O
that	O
this	O
versatility	O
helped	O
him	O
to	O
create	O
Falcon	B-Application
's	I-Application
Eye	I-Application
,	O
as	O
he	O
did	O
not	O
have	O
to	O
work	O
around	O
a	O
fixed	O
character-based	B-Application
interface	O
.	O
</s>
<s>
Falcon	B-Application
's	I-Application
Eye	I-Application
is	O
released	O
under	O
the	O
NetHack	B-Application
General	O
Public	O
License	O
.	O
</s>
<s>
Falcon	B-Application
's	I-Application
Eye	I-Application
was	O
mostly	O
programmed	O
in	O
C	B-Language
,	O
with	O
some	O
C++	B-Language
functions	O
.	O
</s>
<s>
Both	O
SDL	B-Operating_System
and	O
DirectX	B-Application
are	O
used	O
for	O
the	O
graphics	O
and	O
sound	O
in	O
order	O
to	O
make	O
the	O
base	O
code	O
as	O
system-independent	B-Operating_System
as	O
possible	O
.	O
</s>
<s>
Since	O
the	O
release	O
of	O
version	O
1.9.3	O
in	O
2001	O
,	O
development	O
of	O
Falcon	B-Application
's	I-Application
Eye	I-Application
has	O
not	O
progressed	O
,	O
with	O
the	O
game	O
based	O
on	O
a	O
now	O
out-of-date	O
version	O
of	O
NetHack	B-Application
.	O
</s>
<s>
In	O
the	O
interim	O
,	O
at	O
least	O
one	O
unofficial	O
update	O
has	O
appeared	O
in	O
the	O
portage	B-Application
package	B-Application
management	I-Application
system	I-Application
.	O
</s>
<s>
As	O
some	O
users	O
reported	O
difficulty	O
in	O
compiling	O
and	O
installing	O
Falcon	B-Application
's	I-Application
Eye	I-Application
,	O
he	O
also	O
wished	O
to	O
simplify	O
this	O
procedure	O
.	O
</s>
<s>
He	O
also	O
envisions	O
an	O
application	O
for	O
NetHack	B-Application
that	O
allows	O
a	O
user	O
to	O
switch	O
between	O
different	O
user	B-Application
interfaces	I-Application
,	O
similar	O
to	O
software	B-Application
skins	I-Application
.	O
</s>
<s>
The	O
level	O
of	O
inactivity	O
between	O
2001	O
and	O
2005	O
prompted	O
Clive	O
Crous	O
to	O
fork	B-Application
Falcon	B-Application
's	I-Application
Eye	I-Application
to	O
create	O
Vulture	B-Application
's	I-Application
Eye	I-Application
and	O
Vulture	O
's	O
Claw	O
,	O
which	O
have	O
significant	O
improvements	O
on	O
the	O
original	O
.	O
</s>
<s>
The	O
development	O
happened	O
on	O
bitbucket	B-Protocol
,	O
a	O
switch	O
from	O
the	O
previous	O
repository	O
SourceForge	B-Application
.	O
</s>
<s>
The	O
game	O
was	O
ported	O
to	O
several	B-Operating_System
platforms	I-Operating_System
,	O
for	O
instance	O
the	O
OpenPandora	B-Device
handheld	B-Application
.	O
</s>
<s>
Later	O
this	O
development	O
branch	O
was	O
just	O
called	O
Vulture	O
and	O
is	O
under	O
continued	B-Application
development	O
(	O
as	O
of	O
February	O
2017	O
)	O
.	O
</s>
<s>
While	O
still	O
being	O
free	B-Application
and	I-Application
open	I-Application
source	I-Application
software	I-Application
the	O
game	O
is	O
commercialized	B-Application
via	O
the	O
author	O
's	O
website	O
and	O
Desura	B-Language
for	O
$2.99	O
.	O
</s>
<s>
In	O
October	O
2013	O
the	O
game	O
was	O
put	O
into	O
the	O
Steam	B-Application
Greenlight	O
process	O
and	O
successfully	O
released	O
on	O
Steam	B-Application
in	O
February	O
2015	O
.	O
</s>
<s>
Falcon	B-Application
's	I-Application
Eye	I-Application
has	O
been	O
praised	O
for	O
improving	O
NetHack	B-Application
's	O
visuals	O
and	O
audio	O
to	O
an	O
almost	O
commercial	O
level	O
.	O
</s>
<s>
In	O
2003	O
NetHack	B-Application
:	O
Falcon	B-Application
's	I-Application
Eye	I-Application
received	O
The	O
Linux	O
Game	O
Tome	O
's	O
Best	O
Free	O
Role-Playing	O
Game	O
award	O
.	O
</s>
<s>
A	O
2008	O
review	O
of	O
Vulture	B-Application
's	I-Application
Eye	I-Application
on	O
gamesetwatch.com	O
called	O
the	O
graphics	O
"	O
well	O
done	O
"	O
.	O
</s>
<s>
Linux	O
Journal	O
noted	O
the	O
game	O
as	O
among	O
some	O
of	O
the	O
best	O
free	B-Application
games	I-Application
available	O
in	O
2010	O
.	O
</s>
<s>
Between	O
2001	O
and	O
March	O
2018	O
Falcon	B-Application
's	I-Application
Eye	I-Application
was	O
downloaded	O
nearly	O
580,000	O
times	O
from	O
SourceForge	B-Application
while	O
by	O
March	O
2018	O
Steamspy	O
reported	O
over	O
22,000	O
owners	O
of	O
Vulture	O
for	O
Nethack	B-Application
purchased	O
via	O
Steam	B-Application
.	O
</s>
