<s>
Sega	O
,	O
an	O
electro-mechanical	O
arcade	O
game	O
manufacturer	O
,	O
enters	O
the	O
video	O
game	O
industry	O
with	O
Pong	B-Application
clones	O
.	O
</s>
<s>
Computer	B-Application
Space	I-Application
makes	O
appearances	O
in	O
the	O
films	O
Soylent	O
Green	O
and	O
Sleeper	O
.	O
</s>
<s>
Empire	B-Application
versions	O
I	O
,	O
II	O
and	O
III	O
are	O
developed	O
for	O
the	O
PLATO	B-Operating_System
system	I-Operating_System
by	O
John	O
Daleske	O
.	O
</s>
<s>
Silas	O
Warner	O
takes	O
over	O
PLATO	B-Application
Empire	I-Application
version	O
I	O
and	O
renames	O
it	O
Civilization	O
.	O
</s>
<s>
Lemonade	B-Application
Stand	I-Application
is	O
developed	O
for	O
the	O
first	O
time	O
.	O
</s>
<s>
Maze	B-Application
War	I-Application
,	O
an	O
ancestor	O
of	O
the	O
first-person	O
shooter	O
genre	O
and	O
an	O
early	O
network	O
game	O
,	O
begins	O
development	O
for	O
the	O
Imlac	B-Device
PDS-1	I-Device
computer	O
.	O
</s>
<s>
The	O
following	O
titles	O
were	O
the	O
best-selling	O
arcade	B-Application
video	I-Application
games	I-Application
of	O
1973	O
in	O
the	O
United	O
States	O
,	O
according	O
to	O
annual	O
arcade	O
cabinet	O
sales	O
estimates	O
provided	O
by	O
Ralph	O
H	O
.	O
Baer	O
.	O
</s>
<s>
Midway	O
Manufacturing	O
Co	O
.	O
licenses	O
Pong	B-Application
from	O
Atari	O
to	O
produce	O
Winner	O
,	O
their	O
first	O
video	O
game	O
arcade	O
game	O
.	O
</s>
<s>
Atari	O
releases	O
Gotcha	B-Application
,	O
the	O
first	O
commercial	O
maze	B-Application
game	I-Application
,	O
to	O
video	O
arcades	O
.	O
</s>
<s>
Atari	O
releases	O
Pong	B-Application
Doubles	O
to	O
video	O
arcades	O
.	O
</s>
<s>
A	O
variation	O
on	O
the	O
wildly	O
successful	O
Pong	B-Application
,	O
Pong	B-Application
Doubles	O
is	O
the	O
first	O
video	B-Application
arcade	I-Application
game	I-Application
to	O
include	O
four-player	O
gameplay	O
.	O
</s>
<s>
Atari	O
releases	O
Space	B-Application
Race	I-Application
,	O
the	O
first	O
Arcade	O
Racing	O
game	O
ever	O
.	O
</s>
<s>
Williams	O
Electronics	O
releases	O
Paddle	O
Ball	O
,	O
an	O
unlicensed	O
duplicate	O
of	O
Pong	B-Application
,	O
as	O
their	O
first	O
arcade	O
game	O
.	O
</s>
<s>
BASIC	B-Application
Computer	I-Application
Games	I-Application
was	O
first	O
published	O
.	O
</s>
