<s>
Perplexity	B-Application
is	O
a	O
video	O
game	O
created	O
by	O
Ian	O
Collinson	O
for	O
the	O
Acorn	B-Device
Electron	I-Device
and	O
BBC	B-Device
Micro	I-Device
and	O
published	O
by	O
Superior	B-Device
Software	I-Device
in	O
1990	B-Application
.	O
</s>
<s>
It	O
is	O
a	O
pseudo	O
3D	O
maze	B-Application
game	I-Application
with	O
Sokoban-style	O
puzzles	O
.	O
</s>
<s>
Perplexity	B-Application
is	O
an	O
isometric	O
pseudo	O
3D	O
maze	B-Application
game	I-Application
which	O
graphically	O
resembles	O
the	O
1987	O
arcade	O
game	O
Pac-Mania	B-Application
(	O
both	O
the	O
maze	B-Application
view	O
and	O
main	O
characters	O
)	O
but	O
while	O
it	O
does	O
share	O
some	O
gameplay	O
elements	O
,	O
the	O
game	O
is	O
a	O
much	O
more	O
calm	O
and	O
organised	O
playing	O
experience	O
with	O
the	O
emphasis	O
on	O
puzzle-solving	O
and	O
as	O
such	O
has	O
been	O
described	O
as	O
a	O
3D	O
version	O
of	O
Repton	B-Application
.	O
</s>
<s>
There	O
are	O
sixteen	O
mazes	B-Application
containing	O
diamonds	O
which	O
must	O
be	O
collected	O
and	O
monsters	O
to	O
be	O
avoided	O
.	O
</s>
<s>
The	O
mazes	B-Application
are	O
broken	O
up	O
with	O
doors	O
that	O
must	O
be	O
opened	O
by	O
pushing	O
keys	O
into	O
them	O
.	O
</s>
<s>
As	O
the	O
items	O
can	O
only	O
be	O
pushed	O
,	O
and	O
not	O
pulled	O
,	O
the	O
main	O
puzzle	O
element	O
of	O
the	O
game	O
is	O
a	O
Sokoban-style	O
transport	O
puzzle	O
as	O
pushing	O
certain	O
items	O
against	O
a	O
wall	O
or	O
in	O
front	O
of	O
other	O
objects	O
means	O
the	O
level	O
is	O
impossible	O
to	O
complete	O
.	O
</s>
<s>
The	O
game	O
was	O
developed	O
by	O
Ian	O
Collinson	O
in	O
1989	O
and	O
released	O
for	O
the	O
Acorn	B-Device
Electron	I-Device
and	O
BBC	B-Device
Micro	I-Device
in	O
1990	B-Application
by	O
Superior	B-Device
Software	I-Device
.	O
</s>
<s>
Electron	O
User	O
gave	O
the	O
game	O
a	O
score	O
of	O
9/10	O
and	O
"	O
Golden	O
Game	O
"	O
status	O
,	O
concluding	O
"	O
Perplexity	B-Application
is	O
a	O
superb	O
game	O
and	O
will	O
keep	O
you	O
glued	O
to	O
your	O
keyboard	O
for	O
hours	O
...	O
</s>
<s>
BBC	O
Acorn	O
User	O
said	O
the	O
game	O
is	O
a	O
"	O
classic	O
for	O
your	O
collection	O
,	O
but	O
you	O
may	O
end	O
up	O
smashing	O
your	O
Beeb	B-Device
in	O
frustration	O
"	O
.	O
</s>
