<s>
Altitude	B-Application
is	O
a	O
multiplayer	O
2D	O
aerial	O
combat	O
video	O
game	O
developed	O
by	O
American	O
independent	O
software	O
developers	O
Erik	O
Measure	O
and	O
Karl	O
Sabo	O
.	O
</s>
<s>
The	O
game	O
was	O
released	O
on	O
May	O
1	O
,	O
2009	O
for	O
Windows	B-Application
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
and	O
Linux	B-Application
.	O
</s>
<s>
It	O
became	O
available	O
on	O
Steam	B-Application
on	O
December	O
4	O
,	O
2009	O
.	O
</s>
<s>
The	O
game	O
has	O
been	O
described	O
by	O
the	O
press	O
as	O
a	O
cross	O
between	O
Teeworlds	B-Application
,	O
Team	B-Application
Fortress	I-Application
2	I-Application
and	O
a	O
role-playing	O
video	O
game	O
.	O
</s>
<s>
Altitude	B-Application
is	O
primarily	O
an	O
online	O
game	O
with	O
some	O
offline	O
skirmish	O
options	O
and	O
bot	O
support	O
.	O
</s>
<s>
Altitude	B-Application
received	O
favorable	O
reviews	O
and	O
has	O
attained	O
an	O
overall	O
score	O
of	O
79	O
out	O
of	O
100	O
,	O
based	O
on	O
6	O
reviews	O
,	O
on	O
aggregate	O
website	O
Metacritic	O
.	O
</s>
<s>
IT	O
Reviews	O
called	O
it	O
"	O
the	O
perfect	O
lunch	O
break	O
filler	O
,	O
with	O
its	O
fast	O
paced	O
action	B-Application
and	O
quick	O
turnaround	O
matches.	O
"	O
</s>
<s>
AceGamez	O
said	O
that	O
"	O
Altitude	B-Application
's	O
simple	O
premise	O
hides	O
behind	O
a	O
deceptively	O
difficult	O
game	O
,	O
but	O
one	O
that	O
's	O
easily	O
learned	O
and	O
enjoyable	O
to	O
engage	O
in.	O
"	O
</s>
