<s>
Astro	B-Application
Blaster	I-Application
is	O
a	O
space-themed	O
fixed	O
shooter	O
released	O
in	O
arcades	O
by	O
Sega	O
in	O
1981	O
.	O
</s>
<s>
The	O
game	O
uses	O
speech	B-Application
synthesis	I-Application
and	O
during	O
attract	O
mode	O
a	O
voice	O
says	O
"	O
Fighter	O
pilots	O
needed	O
in	O
sector	O
wars	O
...	O
play	O
Astro	B-Application
Blaster	I-Application
!	O
"	O
</s>
<s>
In	O
his	O
1981	O
book	O
How	O
to	O
Master	O
the	O
Video	O
Games	O
Tom	O
Hirschfeld	O
says	O
"	O
ASTRO	B-Application
BLASTER	I-Application
challenges	O
the	O
player	O
with	O
an	O
amazing	O
29	O
different	O
attacks	O
,	O
distributed	O
through	O
six	O
sectors	O
.	O
</s>
<s>
The	O
1981	O
Apple	B-Device
II	I-Device
game	O
Threshold	B-Application
was	O
inspired	O
by	O
seeing	O
an	O
Astro	B-Application
Blaster	I-Application
machine	O
.	O
</s>
<s>
An	O
Astro	B-Application
Blaster	I-Application
cabinet	O
can	O
be	O
seen	O
in	O
Shenmue	B-Application
.	O
</s>
<s>
Astro	B-Application
Blaster	I-Application
is	O
one	O
of	O
five	O
unlockable	O
games	O
in	O
the	O
PlayStation	B-Operating_System
Portable	I-Operating_System
version	O
of	O
Sega	O
Genesis	O
Collection	O
.	O
</s>
