<s>
Jigsaw	B-Application
is	O
an	O
interactive	O
fiction	O
(	O
IF	O
)	O
game	O
,	O
written	O
by	O
Graham	O
Nelson	O
in	O
1995	O
.	O
</s>
<s>
Jigsaw	B-Application
contains	O
references	O
to	O
other	O
interactive	O
fiction	O
games	O
,	O
including	O
Trinity	B-Application
.	O
</s>
<s>
Jigsaw	B-Application
has	O
been	O
described	O
as	O
"	O
acclaimed	O
,	O
"	O
"	O
epic	O
...	O
notable	O
,	O
"	O
and	O
as	O
"[perhaps]	O
one	O
of	O
the	O
most	O
fun	O
educational	O
games	O
in	O
existence	O
"	O
.	O
</s>
