<s>
Brain	O
is	O
an	O
educational	O
video	O
game	O
released	O
in	O
1991	B-Application
by	O
Sierra	O
On-Line	O
.	O
</s>
<s>
One	O
puzzle	O
requires	O
the	O
player	O
to	O
solve	O
a	O
cryptogram	B-Application
,	O
and	O
the	O
penultimate	O
level	O
deals	O
primarily	O
with	O
astronomy	O
.	O
</s>
<s>
In	O
a	O
rather	O
surreal	O
level	O
,	O
the	O
player	O
must	O
put	O
together	O
a	O
jigsaw	B-Application
puzzle	I-Application
which	O
,	O
when	O
completed	O
,	O
becomes	O
a	O
room	O
through	O
which	O
the	O
player	O
passes	O
to	O
go	O
to	O
the	O
next	O
level	O
.	O
</s>
