<s>
Cube	B-Application
is	O
a	O
free	B-License
and	I-License
open-source	I-License
first-person	O
shooter	O
video	O
game	O
.	O
</s>
<s>
It	O
often	O
is	O
mistaken	O
with	O
its	O
engine	O
(	O
zlib-licensed	B-License
)	O
,	O
the	O
Cube	B-Application
Engine	I-Application
.	O
</s>
<s>
It	O
runs	O
on	O
a	O
variety	O
of	O
operating	B-General_Concept
systems	I-General_Concept
,	O
including	O
Microsoft	B-Application
Windows	I-Application
,	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
,	O
OS	B-Operating_System
X	I-Operating_System
,	O
AmigaOS	B-Application
4	I-Application
,	O
AROS	B-Application
,	O
iPhone	B-Device
,	O
Wii	B-Operating_System
and	O
Pocket	B-Device
PC	I-Device
devices	O
with	O
3D	O
acceleration	O
such	O
as	O
Dell	B-Operating_System
Axim	I-Operating_System
x50v	B-Operating_System
.	O
</s>
<s>
It	O
uses	O
OpenGL	B-Application
and	O
SDL	B-Operating_System
.	O
</s>
<s>
Cube	B-Application
has	O
both	O
single-player	O
and	O
multiplayer	O
gameplay	O
.	O
</s>
<s>
The	O
latest	O
update	O
of	O
Cube	B-Application
was	O
released	O
on	O
August	O
29	O
,	O
2005	O
.	O
</s>
<s>
AssaultCube	B-Application
,	O
released	O
in	O
November	O
2006	O
,	O
is	O
the	O
most	O
popular	O
of	O
them	O
.	O
</s>
<s>
An	O
official	O
successor	O
has	O
been	O
made	O
called	O
Cube	B-Application
2	I-Application
:	I-Application
Sauerbraten	I-Application
(	O
also	O
simply	O
known	O
as	O
Sauerbraten	B-Application
)	O
.	O
</s>
<s>
Released	O
in	O
2004	O
,	O
it	O
uses	O
an	O
other	O
engine	O
,	O
the	O
Cube	B-Application
2	I-Application
engine	I-Application
.	O
</s>
<s>
Multiplayer	O
uses	O
a	O
networked	O
game	O
code	O
and	O
a	O
thick	O
client/thin	O
server	B-Application
model	O
.	O
</s>
<s>
The	O
Cube	B-Application
engine	I-Application
was	O
designed	O
as	O
an	O
outdoor	O
engine	O
,	O
i.e.	O
</s>
<s>
it	O
's	O
designed	O
for	O
maps	O
that	O
are	O
outdoors	O
rather	O
than	O
Doom	B-Application
and	O
Quake	B-Application
,	O
which	O
are	O
optimized	O
for	O
indoors	O
.	O
</s>
<s>
It	O
utilizes	O
a	O
pseudo-3D	O
world	O
model	O
similar	O
to	O
the	O
Doom	B-Application
engine	I-Application
,	O
based	O
on	O
a	O
2D	O
height	O
map	O
.	O
</s>
<s>
Cube	B-Application
supports	O
multi-user	O
,	O
realtime	O
map	O
editing	O
.	O
</s>
<s>
Such	O
changes	O
of	O
unclear	O
nature	O
appear	O
both	O
in	O
mods	O
of	O
Cube	B-Application
and	O
in	O
other	O
games	O
using	O
the	O
Cube	B-Application
Engine	I-Application
.	O
</s>
<s>
When	O
the	O
engine	O
is	O
modified	O
,	O
the	O
changes	O
tend	O
to	O
be	O
minor	O
but	O
there	O
also	O
are	O
cases	O
where	O
the	O
changes	O
are	O
significant	O
,	O
such	O
as	O
in	O
AssaultCube	B-Application
(	O
released	O
in	O
November	O
2006	O
)	O
and	O
its	O
fork	O
AssaultCube	B-Application
Reloaded	O
(	O
released	O
in	O
December	O
2010	O
)	O
.	O
</s>
<s>
Intel	O
ported	O
the	O
game	O
to	O
OpenGL	B-Application
ES	I-Application
to	O
demonstrate	O
a	O
new	O
mobile	O
3D	O
chipset	O
at	O
the	O
Game	O
Developers	O
Conference	O
in	O
2005	O
.	O
</s>
<s>
A	O
Cube	B-Application
port	O
,	O
intended	O
as	O
a	O
technology	O
demo	O
was	O
submitted	O
to	O
the	O
iPhone	B-Device
in	O
2008	O
,	O
and	O
was	O
released	O
to	O
the	O
iPhone	B-Application
App	I-Application
Store	I-Application
on	O
November	O
18	O
.	O
</s>
<s>
A	O
version	O
of	O
AssaultCube	B-Application
for	O
Android	O
was	O
released	O
in	O
May	O
2021	O
.	O
</s>
<s>
Cube	B-Application
2	I-Application
:	I-Application
Sauerbraten	I-Application
,	O
released	O
in	O
2004	O
,	O
is	O
the	O
official	O
successor	O
of	O
Cube	B-Application
.	O
</s>
<s>
It	O
uses	O
an	O
other	O
engine	O
,	O
the	O
Cube	B-Application
2	I-Application
Engine	I-Application
.	O
</s>
<s>
Even	O
if	O
the	O
earliest	O
revisions	O
of	O
Cube	B-Application
2	I-Application
Engine	I-Application
were	O
based	O
on	O
the	O
Cube	B-Application
Engine	I-Application
,	O
it	O
became	O
with	O
time	O
very	O
different	O
.	O
</s>
<s>
There	O
are	O
many	O
differences	O
between	O
the	O
Cube	B-Application
Engine	I-Application
and	O
the	O
Cube	B-Application
2	I-Application
Engine	I-Application
,	O
including	O
two	O
major	O
ones	O
.	O
</s>
<s>
Unlike	O
the	O
Cube	B-Application
Engine	I-Application
,	O
that	O
has	O
a	O
2.5D	O
geometry	O
,	O
the	O
Cube	B-Application
2	I-Application
Engine	I-Application
has	O
a	O
real	O
3D	O
geometry	O
.	O
</s>
<s>
In	O
the	O
Cube	B-Application
2	I-Application
:	I-Application
Sauerbraten	I-Application
source	O
code	O
,	O
the	O
one	O
of	O
Sauerbraten	B-Application
is	O
named	O
fpsgame	O
and	O
the	O
one	O
of	O
Eisenstern	O
(	O
the	O
RPG	O
embryo	O
that	O
come	O
with	O
most	O
releases	O
of	O
Cube	B-Application
2	I-Application
:	I-Application
Sauerbraten	I-Application
)	O
is	O
named	O
rpggame	O
.	O
</s>
<s>
Blood	O
Frontier	O
then	O
Red	B-Application
Eclipse	I-Application
(	O
before	O
the	O
version	O
2.0	O
of	O
Red	B-Application
Eclipse	I-Application
)	O
used	O
modded	O
versions	O
of	O
the	O
Cube	B-Application
2	I-Application
Engine	I-Application
.	O
</s>
<s>
Several	O
forks	O
of	O
the	O
Cube	B-Application
2	I-Application
Engine	I-Application
were	O
made	O
but	O
only	O
one	O
of	O
them	O
is	O
its	O
official	O
successor	O
,	O
Tesseract	O
.	O
</s>
<s>
This	O
engine	O
actually	O
share	O
its	O
name	O
with	O
the	O
game	O
it	O
was	O
made	O
for	O
,	O
unlike	O
its	O
predecessors	O
(	O
the	O
Cube	B-Application
Engine	I-Application
was	O
made	O
for	O
Cube	B-Application
and	O
the	O
Cube	B-Application
2	I-Application
Engine	I-Application
was	O
made	O
for	O
Cube	B-Application
2	I-Application
:	I-Application
Sauerbraten	I-Application
)	O
.	O
</s>
<s>
Cube	B-Application
was	O
used	O
in	O
a	O
computer	B-General_Concept
science	I-General_Concept
course	O
at	O
Brown	O
University	O
2006	O
.	O
</s>
<s>
Cube	B-Application
was	O
reviewed	O
positively	O
by	O
LinuxDevCenter	O
in	O
2002	O
and	O
awarded	O
with	O
the	O
"	O
Happypenguin	O
Award	O
"	O
for	O
"	O
Best	O
Free	O
3D	O
Action	O
Game	O
"	O
by	O
The	O
Linux	B-Application
Game	O
Tome	O
in	O
2003	O
.	O
</s>
<s>
In	O
2005	O
in	O
an	O
O'Reilly	O
article	O
on	O
"	O
Open	O
Source	O
Mac	O
Gaming	O
"	O
Cube	B-Application
was	O
recommended	O
.	O
</s>
<s>
MacUpdate	B-Application
rated	O
the	O
game	O
's	O
latest	O
release	O
4.5	O
stars	O
out	O
of	O
5	O
.	O
</s>
<s>
Cube	B-Application
was	O
downloaded	O
between	O
2004	O
and	O
May	O
2017	O
alone	O
from	O
SourceForge.net	B-Application
2.7	O
million	O
times	O
.	O
</s>
