<s>
Tooth	B-Application
Invaders	I-Application
is	O
a	O
video	O
game	O
released	O
by	O
Commodore	O
International	O
for	O
its	O
VIC-20	B-Device
home	O
computer	O
in	O
1981	O
and	O
later	O
for	O
the	O
Commodore	O
64	O
in	O
1982	O
.	O
</s>
<s>
Ready	O
:	O
A	O
Commodore	O
64	O
Retrospective	O
described	O
it	O
as	O
a	O
"	O
simple	O
game	O
"	O
,	O
a	O
"	O
standout	O
"	O
of	O
Commodore	O
's	O
first	O
generation	O
of	O
educational	B-Application
software	O
,	O
and	O
a	O
"	O
pioneer	O
in	O
the	O
serious	O
games	O
and	O
games	O
for	O
health	O
fields	O
"	O
.	O
</s>
