<s>
Border	B-Application
Zone	I-Application
is	O
an	O
interactive	O
fiction	O
video	O
game	O
written	O
by	O
Marc	O
Blank	O
and	O
published	O
by	O
Infocom	O
in	O
1987	O
.	O
</s>
<s>
It	O
was	O
released	O
for	O
DOS	B-Device
,	O
Apple	B-Device
II	I-Device
,	O
Commodore	O
64	O
,	O
Amiga	B-Device
,	O
Atari	B-Device
ST	I-Device
,	O
and	O
Macintosh	B-Device
.	O
</s>
<s>
Unlike	O
most	O
other	O
purely	O
text-based	O
games	O
,	O
Border	B-Application
Zone	I-Application
incorporates	O
real-time	O
aspects	O
of	O
gameplay	O
.	O
</s>
<s>
Mirroring	O
the	O
real-world	O
tension	O
of	O
the	O
Cold	B-Application
War	I-Application
in	O
the	O
1980s	O
,	O
Border	B-Application
Zone	I-Application
is	O
set	O
in	O
and	O
around	O
Ostnitz	O
,	O
located	O
on	O
the	O
border	O
between	O
the	O
Eastern	O
Bloc	O
nation	O
of	O
Frobnia	B-Application
and	O
neutral	O
Litzenburg	O
.	O
</s>
<s>
The	O
celebration	O
of	O
"	O
Constitution	O
Day	O
"	O
in	O
Ostnitz	O
will	O
include	O
a	O
speech	O
by	O
Litzenburg	O
's	O
American	O
ambassador	B-Protocol
;	O
there	O
is	O
a	O
plot	O
in	O
motion	O
,	O
however	O
,	O
to	O
assassinate	O
the	O
ambassador	B-Protocol
in	O
an	O
effort	O
to	O
provoke	O
hostilities	O
between	O
the	O
superpowers	B-Application
.	O
</s>
<s>
Border	B-Application
Zone	I-Application
consists	O
of	O
three	O
chapters	O
,	O
each	O
of	O
which	O
places	O
the	O
player	O
in	O
the	O
role	O
of	O
a	O
different	O
character	O
.	O
</s>
<s>
An	O
American	O
businessman	O
,	O
a	O
KGB	B-Application
agent	O
,	O
and	O
an	O
American	O
spy	O
become	O
entangled	O
in	O
the	O
assassination	O
plot	O
and	O
efforts	O
to	O
either	O
stop	O
it	O
or	O
ensure	O
its	O
success	O
.	O
</s>
<s>
Besides	O
the	O
high	O
quality	O
of	O
their	O
interactive	O
fiction	O
games	O
,	O
Infocom	O
was	O
also	O
known	O
for	O
feelies	O
:	O
extra	O
items	O
included	O
in	O
each	O
game	O
package	O
related	O
to	O
the	O
story	O
,	O
and	O
sometimes	O
used	O
as	O
copy	B-Application
protection	I-Application
.	O
</s>
<s>
The	O
Border	B-Application
Zone	I-Application
feelies	O
included	O
:	O
</s>
