<s>
Space	B-Application
Invaders	I-Application
is	O
a	O
Japanese	O
shooting	O
video	O
game	O
released	O
in	O
1978	O
by	O
Taito	O
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
Tomohiro	O
Nishikado	O
,	O
who	O
was	O
inspired	O
by	O
other	O
media	O
:	O
Breakout	B-Application
,	O
The	B-Application
War	I-Application
of	I-Application
the	I-Application
Worlds	I-Application
,	O
and	O
Star	B-Application
Wars	I-Application
.	O
</s>
<s>
Space	B-Application
Invaders	I-Application
is	O
one	O
of	O
the	O
highest-grossing	O
video	O
game	O
franchises	O
of	O
all	O
time	O
.	O
</s>
<s>
The	O
games	O
have	O
received	O
different	O
receptions	O
:	O
the	O
Atari	B-General_Concept
2600	I-General_Concept
port	O
of	O
the	O
original	O
became	O
the	O
video	O
game	O
industry	O
's	O
first	O
"	O
killer	O
app	O
"	O
,	O
while	O
some	O
sequels	O
were	O
regarded	O
as	O
insignificant	O
updates	O
.	O
</s>
<s>
Space	B-Application
Invaders	I-Application
and	O
several	O
of	O
its	O
arcade	O
sequels	O
are	O
often	O
included	O
in	O
video	O
game	O
compilations	O
released	O
by	O
Taito	O
.	O
</s>
<s>
Many	O
companies	O
created	O
clones	O
that	O
copied	O
its	O
gameplay	O
,	O
with	O
more	O
than	O
a	O
hundred	O
Space	B-Application
Invaders	I-Application
clones	O
released	O
for	O
various	O
platforms	O
(	O
such	O
as	O
Super	B-Application
Invader	I-Application
and	O
TI	B-Application
Invaders	I-Application
)	O
.	O
</s>
<s>
Others	O
built	O
upon	O
the	O
original	O
's	O
gameplay	O
(	O
such	O
as	O
Galaxian	B-Application
and	O
Galaga	B-Application
)	O
.	O
</s>
